Update README.md

Remove section on performance, I can not replicate this and don't want to cause controversy.
Update README.md
2025-12-06 04:41:09 -08:00 · 2020-02-03 20:54:19 +00:00 · 2020-02-03 20:52:12 +00:00 · 2020-02-03 20:31:37 +00:00 · 2020-01-29 18:36:13 -06:00 · 2020-01-29 18:36:13 -06:00
20 changed files with 2193 additions and 463 deletions
--- a/.github/workflows/CICD.yml
+++ b/.github/workflows/CICD.yml
@@ -0,0 +1,286 @@
+name: CICD
+
+# spell-checker:ignore CICD CODECOV MSVC MacOS Peltoche SHAs buildable clippy esac fakeroot gnueabihf halium libssl mkdir musl popd printf pushd rustfmt softprops toolchain
+
+env:
+  PROJECT_NAME: dust
+  PROJECT_DESC: "du + rust = dust"
+  PROJECT_AUTH: "bootandy"
+  RUST_MIN_SRV: "1.31.0"
+
+on: [push, pull_request]
+
+jobs:
+  style:
+    name: Style
+    runs-on: ${{ matrix.job.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        job:
+          - { os: ubuntu-latest }
+          - { os: macos-latest }
+          - { os: windows-latest }
+    steps:
+    - uses: actions/checkout@v1
+    - name: Initialize workflow variables
+      id: vars
+      shell: bash
+      run: |
+        # 'windows-latest' `cargo fmt` is bugged for this project (see reasons @ GH:rust-lang/rustfmt #3324, #3590, #3688 ; waiting for repair)
+        JOB_DO_FORMAT_TESTING="true"
+        case ${{ matrix.job.os }} in windows-latest) unset JOB_DO_FORMAT_TESTING ;; esac;
+        echo set-output name=JOB_DO_FORMAT_TESTING::${JOB_DO_FORMAT_TESTING:-<empty>/false}
+        echo ::set-output name=JOB_DO_FORMAT_TESTING::${JOB_DO_FORMAT_TESTING}
+    - name: Install `rust` toolchain
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: stable
+        override: true
+        profile: minimal # minimal component installation (ie, no documentation)
+        components: rustfmt, clippy
+    - name: "`fmt` testing"
+      if: steps.vars.outputs.JOB_DO_FORMAT_TESTING
+      uses: actions-rs/cargo@v1
+      with:
+        command: fmt
+        args: --all -- --check
+    - name: "`clippy` testing"
+      if: success() || failure() # run regardless of prior step ("`fmt` testing") success/failure
+      uses: actions-rs/cargo@v1
+      with:
+        command: clippy
+        args: ${{ matrix.job.cargo-options }} --features "${{ matrix.job.features }}" -- -D warnings
+
+  min_version:
+    name: MinSRV # Minimum supported rust version
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install `rust` toolchain (v${{ env.RUST_MIN_SRV }})
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ env.RUST_MIN_SRV }}
+        profile: minimal # minimal component installation (ie, no documentation)
+    - name: Test
+      uses: actions-rs/cargo@v1
+      with:
+        command: test
+
+  build:
+    name: Build
+    runs-on: ${{ matrix.job.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        job:
+          # { os, target, cargo-options, features, use-cross, toolchain }
+          - { os: ubuntu-latest  , target: arm-unknown-linux-gnueabihf , use-cross: use-cross }
+          - { os: ubuntu-18.04   , target: i686-unknown-linux-gnu      , use-cross: use-cross }
+          - { os: ubuntu-18.04   , target: i686-unknown-linux-musl     , use-cross: use-cross }
+          - { os: ubuntu-18.04   , target: x86_64-unknown-linux-gnu    , use-cross: use-cross }
+          - { os: ubuntu-18.04   , target: x86_64-unknown-linux-musl   , use-cross: use-cross }
+          - { os: ubuntu-16.04   , target: x86_64-unknown-linux-gnu    , use-cross: use-cross }
+          - { os: macos-latest   , target: x86_64-apple-darwin         }
+          - { os: windows-latest , target: i686-pc-windows-gnu         }
+          - { os: windows-latest , target: i686-pc-windows-msvc        }
+          - { os: windows-latest , target: x86_64-pc-windows-gnu       } ## !maint: [rivy; 2020-01-21] may break due to rust bug; follow possible solution from GH:rust-lang/rust#47048 (refs: GH:rust-lang/rust#47048 , GH:rust-lang/rust#53454 , GH:bike-barn/hermit#172 )
+          - { os: windows-latest , target: x86_64-pc-windows-msvc      }
+    steps:
+    - uses: actions/checkout@v1
+    - name: Install any prerequisites
+      shell: bash
+      run: |
+        case ${{ matrix.job.target }} in
+          arm-unknown-linux-gnueabihf) sudo apt-get -y update ; sudo apt-get -y install gcc-arm-linux-gnueabihf ;;
+        esac
+    - name: Initialize workflow variables
+      id: vars
+      shell: bash
+      run: |
+        # toolchain
+        TOOLCHAIN="stable" ## default to "stable" toolchain
+        # * specify alternate TOOLCHAIN for *-pc-windows-gnu targets; gnu targets on Windows are broken for the standard *-pc-windows-msvc toolchain (refs: <https://github.com/rust-lang/rust/issues/47048>, <https://github.com/rust-lang/rust/issues/53454>, <https://github.com/rust-lang/cargo/issues/6754>)
+        case ${{ matrix.job.target }} in *-pc-windows-gnu) TOOLCHAIN="stable-${{ matrix.job.target }}" ;; esac;
+        # * use requested TOOLCHAIN if specified
+        if [ -n "${{ matrix.job.toolchain }}" ]; then TOOLCHAIN="${{ matrix.job.toolchain }}" ; fi
+        echo set-output name=TOOLCHAIN::${TOOLCHAIN}
+        echo ::set-output name=TOOLCHAIN::${TOOLCHAIN}
+        # staging directory
+        STAGING='_staging'
+        echo set-output name=STAGING::${STAGING}
+        echo ::set-output name=STAGING::${STAGING}
+        # determine EXE suffix
+        EXE_suffix="" ; case ${{ matrix.job.target }} in *-pc-windows-*) EXE_suffix=".exe" ;; esac;
+        echo set-output name=EXE_suffix::${EXE_suffix}
+        echo ::set-output name=EXE_suffix::${EXE_suffix}
+        # parse commit reference info
+        REF_NAME=${GITHUB_REF#refs/*/}
+        unset REF_BRANCH ; case ${GITHUB_REF} in refs/heads/*) REF_BRANCH=${GITHUB_REF#refs/heads/} ;; esac;
+        unset REF_TAG ; case ${GITHUB_REF} in refs/tags/*) REF_TAG=${GITHUB_REF#refs/tags/} ;; esac;
+        REF_SHAS=${GITHUB_SHA:0:8}
+        echo set-output name=REF_NAME::${REF_NAME}
+        echo set-output name=REF_BRANCH::${REF_BRANCH}
+        echo set-output name=REF_TAG::${REF_TAG}
+        echo set-output name=REF_SHAS::${REF_SHAS}
+        echo ::set-output name=REF_NAME::${REF_NAME}
+        echo ::set-output name=REF_BRANCH::${REF_BRANCH}
+        echo ::set-output name=REF_TAG::${REF_TAG}
+        echo ::set-output name=REF_SHAS::${REF_SHAS}
+        # parse target
+        unset TARGET_ARCH ; case ${{ matrix.job.target }} in arm-unknown-linux-gnueabihf) TARGET_ARCH=arm ;; i686-*) TARGET_ARCH=i686 ;; x86_64-*) TARGET_ARCH=x86_64 ;; esac;
+        echo set-output name=TARGET_ARCH::${TARGET_ARCH}
+        echo ::set-output name=TARGET_ARCH::${TARGET_ARCH}
+        unset TARGET_OS ; case ${{ matrix.job.target }} in *-linux-*) TARGET_OS=linux ;; *-apple-*) TARGET_OS=macos ;; *-windows-*) TARGET_OS=windows ;; esac;
+        echo set-output name=TARGET_OS::${TARGET_OS}
+        echo ::set-output name=TARGET_OS::${TARGET_OS}
+        # package name
+        PKG_suffix=".tar.gz" ; case ${{ matrix.job.target }} in *-pc-windows-*) PKG_suffix=".zip" ;; esac;
+        PKG_BASENAME=${PROJECT_NAME}-${REF_TAG:-$REF_SHAS}-${{ matrix.job.target }}
+        PKG_NAME=${PKG_BASENAME}${PKG_suffix}
+        echo set-output name=PKG_suffix::${PKG_suffix}
+        echo set-output name=PKG_BASENAME::${PKG_BASENAME}
+        echo set-output name=PKG_NAME::${PKG_NAME}
+        echo ::set-output name=PKG_suffix::${PKG_suffix}
+        echo ::set-output name=PKG_BASENAME::${PKG_BASENAME}
+        echo ::set-output name=PKG_NAME::${PKG_NAME}
+        # deployable tag? (ie, leading "vM" or "M"; M == version number)
+        unset DEPLOY ; if [[ $REF_TAG =~ ^[vV]?[0-9].* ]]; then DEPLOY='true' ; fi
+        echo set-output name=DEPLOY::${DEPLOY:-<empty>/false}
+        echo ::set-output name=DEPLOY::${DEPLOY}
+        # target-specific options
+        # * CARGO_USE_CROSS (truthy)
+        CARGO_USE_CROSS='true' ; case '${{ matrix.job.use-cross }}' in ''|0|f|false|n|no) unset CARGO_USE_CROSS ;; esac;
+        echo set-output name=CARGO_USE_CROSS::${CARGO_USE_CROSS:-<empty>/false}
+        echo ::set-output name=CARGO_USE_CROSS::${CARGO_USE_CROSS}
+        # # * `arm` cannot be tested on ubuntu-* hosts (b/c testing is currently primarily done via comparison of target outputs with built-in outputs and the `arm` target is not executable on the host)
+        JOB_DO_TESTING="true"
+        case ${{ matrix.job.target }} in arm-*) unset JOB_DO_TESTING ;; esac;
+        echo set-output name=JOB_DO_TESTING::${JOB_DO_TESTING:-<empty>/false}
+        echo ::set-output name=JOB_DO_TESTING::${JOB_DO_TESTING}
+        # # * test only binary for arm-type targets
+        unset CARGO_TEST_OPTIONS
+        unset CARGO_TEST_OPTIONS ; case ${{ matrix.job.target }} in arm-*) CARGO_TEST_OPTIONS="--bin ${PROJECT_NAME}" ;; esac;
+        echo set-output name=CARGO_TEST_OPTIONS::${CARGO_TEST_OPTIONS}
+        echo ::set-output name=CARGO_TEST_OPTIONS::${CARGO_TEST_OPTIONS}
+        # * strip executable?
+        STRIP="strip" ; case ${{ matrix.job.target }} in arm-unknown-linux-gnueabihf) STRIP="arm-linux-gnueabihf-strip" ;; *-pc-windows-msvc) STRIP="" ;; esac;
+        echo set-output name=STRIP::${STRIP}
+        echo ::set-output name=STRIP::${STRIP}
+    - name: Create all needed build/work directories
+      shell: bash
+      run: |
+        mkdir -p '${{ steps.vars.outputs.STAGING }}'
+        mkdir -p '${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_BASENAME }}'
+    - name: rust toolchain ~ install
+      uses: actions-rs/toolchain@v1
+      with:
+        toolchain: ${{ steps.vars.outputs.TOOLCHAIN }}
+        target: ${{ matrix.job.target }}
+        override: true
+        profile: minimal # minimal component installation (ie, no documentation)
+    - name: Info
+      shell: bash
+      run: |
+        gcc --version || true
+        rustup -V
+        rustup toolchain list
+        rustup default
+        cargo -V
+        rustc -V
+    - name: Build
+      uses: actions-rs/cargo@v1
+      with:
+        use-cross: ${{ steps.vars.outputs.CARGO_USE_CROSS }}
+        command: build
+        args: --release --target=${{ matrix.job.target }} ${{ matrix.job.cargo-options }} --features "${{ matrix.job.features }}"
+    - name: Test
+      uses: actions-rs/cargo@v1
+      with:
+        use-cross: ${{ steps.vars.outputs.CARGO_USE_CROSS }}
+        command: test
+        args: --target=${{ matrix.job.target }} ${{ steps.vars.outputs.CARGO_TEST_OPTIONS}} ${{ matrix.job.cargo-options }} --features "${{ matrix.job.features }}"
+    - name: Archive executable artifacts
+      uses: actions/upload-artifact@master
+      with:
+        name: ${{ env.PROJECT_NAME }}-${{ matrix.job.target }}
+        path: target/${{ matrix.job.target }}/release/${{ env.PROJECT_NAME }}${{ steps.vars.outputs.EXE_suffix }}
+    - name: Package
+      shell: bash
+      run: |
+        # binary
+        cp 'target/${{ matrix.job.target }}/release/${{ env.PROJECT_NAME }}${{ steps.vars.outputs.EXE_suffix }}' '${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_BASENAME }}/'
+        # `strip` binary (if needed)
+        if [ -n "${{ steps.vars.outputs.STRIP }}" ]; then "${{ steps.vars.outputs.STRIP }}" '${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_BASENAME }}/${{ env.PROJECT_NAME }}${{ steps.vars.outputs.EXE_suffix }}' ; fi
+        # README and LICENSE
+        cp README.md '${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_BASENAME }}/'
+        cp LICENSE '${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_BASENAME }}/'
+        # base compressed package
+        pushd '${{ steps.vars.outputs.STAGING }}/' >/dev/null
+        case ${{ matrix.job.target }} in
+          *-pc-windows-*) 7z -y a '${{ steps.vars.outputs.PKG_NAME }}' '${{ steps.vars.outputs.PKG_BASENAME }}'/* | tail -2 ;;
+          *) tar czf '${{ steps.vars.outputs.PKG_NAME }}' '${{ steps.vars.outputs.PKG_BASENAME }}'/* ;;
+        esac;
+        popd >/dev/null
+    - name: Publish
+      uses: softprops/action-gh-release@v1
+      if: steps.vars.outputs.DEPLOY
+      with:
+        files: |
+          ${{ steps.vars.outputs.STAGING }}/${{ steps.vars.outputs.PKG_NAME }}
+      env:
+        GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  ## fix! [rivy; 2020-22-01] `cargo tarpaulin` is unable to test this repo at the moment; alternate recipe or another testing framework?
+  # coverage:
+  #   name: Code Coverage
+  #   runs-on: ${{ matrix.job.os }}
+  #   strategy:
+  #     fail-fast: true
+  #     matrix:
+  #       # job: [ { os: ubuntu-latest }, { os: macos-latest }, { os: windows-latest } ]
+  #       job: [ { os: ubuntu-latest } ] ## cargo-tarpaulin is currently only available on linux
+  #   steps:
+  #   - uses: actions/checkout@v1
+  #   # - name: Reattach HEAD ## may be needed for accurate code coverage info
+  #   #   run: git checkout ${{ github.head_ref }}
+  #   - name: Initialize workflow variables
+  #     id: vars
+  #     shell: bash
+  #     run: |
+  #       # staging directory
+  #       STAGING='_staging'
+  #       echo set-output name=STAGING::${STAGING}
+  #       echo ::set-output name=STAGING::${STAGING}
+  #       # check for CODECOV_TOKEN availability (work-around for inaccessible 'secrets' object for 'if'; see <https://github.community/t5/GitHub-Actions/jobs-lt-job-id-gt-if-does-not-work-with-env-secrets/m-p/38549>)
+  #       unset HAS_CODECOV_TOKEN
+  #       if [ -n $CODECOV_TOKEN ]; then HAS_CODECOV_TOKEN='true' ; fi
+  #       echo set-output name=HAS_CODECOV_TOKEN::${HAS_CODECOV_TOKEN}
+  #       echo ::set-output name=HAS_CODECOV_TOKEN::${HAS_CODECOV_TOKEN}
+  #     env:
+  #       CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
+  #   - name: Create all needed build/work directories
+  #     shell: bash
+  #     run: |
+  #       mkdir -p '${{ steps.vars.outputs.STAGING }}/work'
+  #   - name: Install required packages
+  #     run: |
+  #       sudo apt-get -y install libssl-dev
+  #       pushd '${{ steps.vars.outputs.STAGING }}/work' >/dev/null
+  #       wget --no-verbose https://github.com/xd009642/tarpaulin/releases/download/0.9.3/cargo-tarpaulin-0.9.3-travis.tar.gz
+  #       tar xf cargo-tarpaulin-0.9.3-travis.tar.gz
+  #       cp cargo-tarpaulin "$(dirname -- "$(which cargo)")"/
+  #       popd >/dev/null
+  #   - name: Generate coverage
+  #     run: |
+  #       cargo tarpaulin --out Xml
+  #   - name: Upload coverage results (CodeCov.io)
+  #     # CODECOV_TOKEN (aka, "Repository Upload Token" for REPO from CodeCov.io) ## set via REPO/Settings/Secrets
+  #     # if: secrets.CODECOV_TOKEN (not supported {yet?}; see <https://github.community/t5/GitHub-Actions/jobs-lt-job-id-gt-if-does-not-work-with-env-secrets/m-p/38549>)
+  #     if: steps.vars.outputs.HAS_CODECOV_TOKEN
+  #     run: |
+  #       # CodeCov.io
+  #       cargo tarpaulin --out Xml
+  #       bash <(curl -s https://codecov.io/bash)
+  #     env:
+  #       CODECOV_TOKEN: "${{ secrets.CODECOV_TOKEN }}"
--- a/.gitignore
+++ b/.gitignore
@@ -2,10 +2,8 @@
 # will have compiled files and executables
 /target/

-# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
-# More information here http://doc.crates.io/guide.html#cargotoml-vs-cargolock
-Cargo.lock
-
 # These are backup files generated by rustfmt
 **/*.rs.bk
 *.swp
+.vscode/*
+*.idea/*
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,6 +1,12 @@
 # Based on the "trust" template v0.1.2
 # https://github.com/japaric/trust/tree/v0.1.2

+# ----------- To do a release ---------
+# tag a commit and push:
+#   git tag v0.4.0.1
+#   git push origin v0.4.0.1
+# Remember to do a cargo publish to put it in crates.io
+
 dist: trusty
 language: rust
 services: docker
@@ -19,17 +25,9 @@ matrix:
  # don't need
  include:
    # Linux
-    - env: TARGET=aarch64-unknown-linux-gnu
-    - env: TARGET=arm-unknown-linux-gnueabi
-    - env: TARGET=armv7-unknown-linux-gnueabihf
-    - env: TARGET=i686-unknown-linux-gnu
-    - env: TARGET=i686-unknown-linux-musl
    - env: TARGET=x86_64-unknown-linux-gnu
-    - env: TARGET=x86_64-unknown-linux-musl

    # OSX
-    - env: TARGET=i686-apple-darwin
-      os: osx
    - env: TARGET=x86_64-apple-darwin
      os: osx

@@ -54,8 +52,9 @@ deploy:
  # - Create a `public_repo` GitHub token. Go to: https://github.com/settings/tokens/new
  # - Encrypt it: `travis encrypt 0123456789012345678901234567890123456789
  # - Paste the output down here
-  api_key:
-    secure: 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
+#  api_key:
+#    secure: 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
+  api_key: $API_KEY
  file_glob: true
  file: $CRATE_NAME-$TRAVIS_TAG-$TARGET.*
  on:
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -0,0 +1,585 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "ansi_term"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "ansi_term"
+version = "0.12.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "assert_cli"
+version = "0.6.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "colored 1.9.2 (registry+https://github.com/rust-lang/crates.io-index)",
+ "difference 2.0.0 (registry+https://github.com/rust-lang/crates.io-index)",
+ "environment 0.1.1 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "failure_derive 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "serde_json 1.0.44 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "atty"
+version = "0.2.14"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+dependencies = [
+ "hermit-abi 0.1.6 (registry+https://github.com/rust-lang/crates.io-index)",
+ "libc 0.2.66 (registry+https://github.com/rust-lang/crates.io-index)",
+ "winapi 0.3.8 (registry+https://github.com/rust-lang/crates.io-index)",
+]
+
+[[package]]
+name = "autocfg"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+
+[[package]]
+name = "backtrace"
+version = "0.3.42"
+source = "registry+https://github.com/rust-lang/crates.io-index"
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--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,8 +1,34 @@
 [package]
+name = "du-dust"
+description = "A more intuitive version of du"
+version = "0.4.4"
+authors = ["bootandy <bootandy@gmail.com>", "nebkor <code@ardent.nebcorp.com>"]
+edition = "2018"
+
+documentation = "https://github.com/bootandy/dust"
+homepage = "https://github.com/bootandy/dust"
+repository = "https://github.com/bootandy/dust"
+
+keywords = ["du", "command-line", "disk", "disk-usage"]
+categories = ["command-line-utilities"]
+license = "Apache-2.0"
+
+[badges]
+travis-ci = {repository = "https://travis-ci.org/bootandy/dust"}
+
+[[bin]]
 name = "dust"
-version = "0.1.0"
-authors = ["bootandy <bootandy@gmail.com>"]
+path = "src/main.rs"

 [dependencies]
-ansi_term = "0.11"
-clap = "2.31"
+ansi_term = "=0.12"
+clap = "=2.33"
+jwalk = "0.4.0"
+num_cpus = "1.12"
+
+[target.'cfg(windows)'.dependencies]
+winapi-util = "0.1"
+
+[dev-dependencies]
+assert_cli = "=0.6"
+tempfile = "=3"
--- a/README.md
+++ b/README.md
@@ -1,42 +1,74 @@
+
 [![Build Status](https://travis-ci.org/bootandy/dust.svg?branch=master)](https://travis-ci.org/bootandy/dust)

-
 # Dust
-du + rust = dust. A rust alternative to du

-Unlike du, dust is meant to give you an instant overview of which directories are using disk space without requiring sort or head. Dust does not count file system blocks; it uses file sizes instead. Dust will print a maximum of 1 'Did not have permissions message'.
+du + rust = dust. Like du but more intuitive

+## Install

-Dust will list the 15 biggest sub directories and will smartly recurse down the tree to find the larger ones. There is no need for a '-d' flag or a '-h' flag. The largest sub directory will have its size shown in red
+#### Cargo Install
+
+* cargo install du-dust
+
+#### Download Install
+
+* Download linux / mac binary from [Releases](https://github.com/bootandy/dust/releases)
+* unzip file: tar -xvf _downloaded_file.tar.gz_
+* move file to executable path: sudo mv dust /usr/local/bin/
+
+## Overview
+
+Dust is meant to give you an instant overview of which directories are using disk space without requiring sort or head. Dust will print a maximum of 1 'Did not have permissions message'.
+
+Dust will list the 20 biggest sub directories or files and will smartly recurse down the tree to find the larger ones. There is no need for a '-d' flag or a '-h' flag. The largest sub directory will have its size shown in *red*
+
+## Why?
+
+du has a number of ways of showing you what it finds, in terms of disk consumption, but really, there are only one or two ways you invoke it: with -h for “human readable” units, like 100G or 89k, or with -b for “bytes”. The former is generally used for a quick survey of a directory with a small number of things in it, and the latter for when you have a bunch and need to sort the output numerically, and you’re obligated to either further pass it into something like awk to turn bytes into the appropriate human-friendly unit like mega or gigabytes, or pipe thru sort and head while remembering the '-h' flag. Then once you have the top offenders, you recurse down into the largest one and repeat the process until you’ve found your cruft or gems and can move on.
+
+Dust assumes that’s what you wanted to do in the first place, and takes care of tracking the largest offenders in terms of actual size, and showing them to you with human-friendly units and in-context within the filetree.
+
+## Usage

 ```
+Usage: dust
 Usage: dust <dir>
-Usage: dust -n 30  <dir>  (Shows 30 directories not 15)
+Usage: dust <dir>  <another_dir> <and_more>
+Usage: dust -p <dir>  (full-path - does not shorten the path of the subdirectories)
+Usage: dust -s <dir>  (apparent-size - shows the length of the file as opposed to the amount of disk space it uses)
+Usage: dust -n 30  <dir>  (Shows 30 directories not 20)
+Usage: dust -d 3  <dir>  (Shows 3 levels of subdirectories)
+Usage: dust -r  <dir>  (Reverse order of output, with root at the lowest)
+Usage: dust -x  <dir>  (Only show directories on same filesystem)
+Usage: dust -X ignore  <dir>  (Ignore all files and directories containing the string 'ignore')
+```
+
+```
+djin:git/dust> dust
+ 1.2G  target
+ 622M ├─┬ debug
+ 445M │ ├── deps
+  70M │ ├── incremental
+  56M │ └── build
+ 262M ├─┬ rls
+ 262M │ └─┬ debug
+ 203M │   ├── deps
+  56M │   └── build
+ 165M ├─┬ package
+ 165M │ └─┬ du-dust-0.2.4
+ 165M │   └─┬ target
+ 165M │     └─┬ debug
+ 131M │       └── deps
+ 165M └─┬ release
+ 124M   └── deps
 ```


-```
-dust .
- 161M  .
- 160M └── ./target
- 123M    ├── ./target/debug
-  83M    │  ├── ./target/debug/deps
-  16M    │  │  ├── ./target/debug/deps/libclap-82e6176feef5d4b7.rlib
- 8.6M    │  │  └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM
- 8.6M    │  │     └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM/Contents
- 8.6M    │  │        └── ./target/debug/deps/dust-993f7d919d92f0f8.dSYM/Contents/Resources
-  27M    │  ├── ./target/debug/incremental
-  12M    │  └── ./target/debug/build
-  20M    ├── ./target/x86_64-apple-darwin
-  20M    │  └── ./target/x86_64-apple-darwin/debug
-  20M    │     └── ./target/x86_64-apple-darwin/debug/deps
-  16M    │        └── ./target/x86_64-apple-darwin/debug/deps/libclap-7e3f8513c52cd558.rlib
-  16M    └── ./target/release
-  13M       └── ./target/release/deps
-```
-
-Performance: dust is currently about 4 times slower than du.
-
-
+## Alternatives

+* [NCDU](https://dev.yorhel.nl/ncdu)
+* [dutree](https://github.com/nachoparker/dutree)
+* du -d 1 -h | sort -h

+Note: Apparent-size is calculated slightly differently in dust to gdu. In dust each hard link is counted as using file_length space. In gdu only the first entry is counted.
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -1,93 +0,0 @@
-# Based on the "trust" template v0.1.2
-# https://github.com/japaric/trust/tree/v0.1.2
-
-environment:
-  global:
-  # TODO This is the Rust channel that build jobs will use by default but can be
-  # overridden on a case by case basis down below
-    RUST_VERSION: stable
-
-    # TODO Update this to match the name of your project.
-    CRATE_NAME: dust
-
-  # TODO These are all the build jobs. Adjust as necessary. Comment out what you
-  # don't need
-  matrix:
-    # MinGW
-    - TARGET: i686-pc-windows-gnu
-    - TARGET: x86_64-pc-windows-gnu
-
-    # MSVC
-    - TARGET: i686-pc-windows-msvc
-    - TARGET: x86_64-pc-windows-msvc
-
-    # Testing other channels
-    - TARGET: x86_64-pc-windows-gnu
-      RUST_VERSION: nightly
-    - TARGET: x86_64-pc-windows-msvc
-      RUST_VERSION: nightly
-
-install:
-  - ps: >-
-      If ($Env:TARGET -eq 'x86_64-pc-windows-gnu') {
-        $Env:PATH += ';C:\msys64\mingw64\bin'
-      } ElseIf ($Env:TARGET -eq 'i686-pc-windows-gnu') {
-        $Env:PATH += ';C:\msys64\mingw32\bin'
-      }
-  - curl -sSf -o rustup-init.exe https://win.rustup.rs/
-  - rustup-init.exe -y --default-host %TARGET% --default-toolchain %RUST_VERSION%
-  - set PATH=%PATH%;C:\Users\appveyor\.cargo\bin
-  - rustc -Vv
-  - cargo -V
-
-# TODO This is the "test phase", tweak it as you see fit
-test_script:
-  # we don't run the "test phase" when doing deploys
-  - if [%APPVEYOR_REPO_TAG%]==[false] (
-      cargo build --target %TARGET% &&
-      cargo build --target %TARGET% --release &&
-      cargo test --target %TARGET% &&
-      cargo test --target %TARGET% --release &&
-      cargo run --target %TARGET% &&
-      cargo run --target %TARGET% --release
-    )
-
-before_deploy:
-  # TODO Update this to build the artifacts that matter to you
-  - cargo rustc --target %TARGET% --release --bin hello -- -C lto
-  - ps: ci\before_deploy.ps1
-
-deploy:
-  artifact: /.*\.zip/
-  # TODO update `auth_token.secure`
-  # - Create a `public_repo` GitHub token. Go to: https://github.com/settings/tokens/new
-  # - Encrypt it. Go to https://ci.appveyor.com/tools/encrypt
-  # - Paste the output down here
-  auth_token:
-    secure: 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
-  description: ''
-  on:
-    # TODO Here you can pick which targets will generate binary releases
-    # In this example, there are some targets that are tested using the stable
-    # and nightly channels. This condition makes sure there is only one release
-    # for such targets and that's generated using the stable channel
-    RUST_VERSION: stable
-    appveyor_repo_tag: true
-  provider: GitHub
-
-cache:
-  - C:\Users\appveyor\.cargo\registry
-  - target
-
-branches:
-  only:
-    # Release tags
-    - /^v\d+\.\d+\.\d+.*$/
-    - master
-
-notifications:
-  - provider: Email
-    on_build_success: false
-
-# Building is done in the test phase, so we disable Appveyor's build phase.
-build: false
--- a/ci/before_deploy.sh
+++ b/ci/before_deploy.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This script takes care of building your crate and packaging it for release

 set -ex
--- a/ci/install.sh
+++ b/ci/install.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 set -ex

 main() {
--- a/ci/script.sh
+++ b/ci/script.sh
@@ -1,3 +1,4 @@
+#!/usr/bin/env bash
 # This script takes care of testing your crate

 set -ex
--- a/src/display.rs
+++ b/src/display.rs
@@ -0,0 +1,213 @@
+extern crate ansi_term;
+
+use self::ansi_term::Colour::Fixed;
+use self::ansi_term::Style;
+use crate::utils::Node;
+
+static UNITS: [char; 4] = ['T', 'G', 'M', 'K'];
+
+pub struct DisplayData {
+    pub short_paths: bool,
+    pub is_reversed: bool,
+    pub colors_on: bool,
+}
+
+impl DisplayData {
+    fn get_first_chars(&self) -> &str {
+        if self.is_reversed {
+            "─┴"
+        } else {
+            "─┬"
+        }
+    }
+
+    #[allow(clippy::collapsible_if)]
+    fn get_tree_chars(
+        &self,
+        num_siblings: u64,
+        max_siblings: u64,
+        has_children: bool,
+    ) -> &'static str {
+        if self.is_reversed {
+            if num_siblings == max_siblings - 1 {
+                if has_children {
+                    "┌─┴"
+                } else {
+                    "┌──"
+                }
+            } else if has_children {
+                "├─┴"
+            } else {
+                "├──"
+            }
+        } else {
+            if num_siblings == 0 {
+                if has_children {
+                    "└─┬"
+                } else {
+                    "└──"
+                }
+            } else if has_children {
+                "├─┬"
+            } else {
+                "├──"
+            }
+        }
+    }
+
+    fn is_biggest(&self, num_siblings: u64, max_siblings: u64) -> bool {
+        if self.is_reversed {
+            num_siblings == 0
+        } else {
+            num_siblings == max_siblings - 1
+        }
+    }
+
+    fn get_children_from_node(&self, node: Node) -> impl Iterator<Item = Node> {
+        if self.is_reversed {
+            let n: Vec<Node> = node.children.into_iter().rev().map(|a| a).collect();
+            n.into_iter()
+        } else {
+            node.children.into_iter()
+        }
+    }
+}
+
+pub fn draw_it(
+    permissions: bool,
+    use_full_path: bool,
+    is_reversed: bool,
+    no_colors: bool,
+    root_node: Node,
+) {
+    if !permissions {
+        eprintln!("Did not have permissions for all directories");
+    }
+    let display_data = DisplayData {
+        short_paths: !use_full_path,
+        is_reversed,
+        colors_on: !no_colors,
+    };
+
+    for c in display_data.get_children_from_node(root_node) {
+        let first_tree_chars = display_data.get_first_chars();
+        display_node(c, true, first_tree_chars, &display_data)
+    }
+}
+
+fn display_node(node: Node, is_biggest: bool, indent: &str, display_data: &DisplayData) {
+    let mut num_siblings = node.children.len() as u64;
+    let max_sibling = num_siblings;
+    let new_indent = clean_indentation_string(indent);
+    let name = node.name.clone();
+    let size = node.size;
+
+    if !display_data.is_reversed {
+        print_this_node(&*name, size, is_biggest, display_data, indent);
+    }
+
+    for c in display_data.get_children_from_node(node) {
+        num_siblings -= 1;
+        let chars = display_data.get_tree_chars(num_siblings, max_sibling, !c.children.is_empty());
+        let is_biggest = display_data.is_biggest(num_siblings, max_sibling);
+        let full_indent = new_indent.clone() + chars;
+        display_node(c, is_biggest, &*full_indent, display_data)
+    }
+
+    if display_data.is_reversed {
+        print_this_node(&*name, size, is_biggest, display_data, indent);
+    }
+}
+
+fn clean_indentation_string(s: &str) -> String {
+    let mut is: String = s.into();
+    // For reversed:
+    is = is.replace("┌─┴", "  ");
+    is = is.replace("┌──", "  ");
+    is = is.replace("├─┴", "│ ");
+    is = is.replace("─┴", " ");
+    // For normal
+    is = is.replace("└─┬", "  ");
+    is = is.replace("└──", "  ");
+    is = is.replace("├─┬", "│ ");
+    is = is.replace("─┬", " ");
+    // For both
+    is = is.replace("├──", "│ ");
+    is
+}
+
+fn print_this_node(
+    name: &str,
+    size: u64,
+    is_biggest: bool,
+    display_data: &DisplayData,
+    indentation: &str,
+) {
+    let pretty_size = format!("{:>5}", human_readable_number(size),);
+    println!(
+        "{}",
+        format_string(name, is_biggest, display_data, &*pretty_size, indentation)
+    )
+}
+
+pub fn format_string(
+    dir_name: &str,
+    is_biggest: bool,
+    display_data: &DisplayData,
+    size: &str,
+    indentation: &str,
+) -> String {
+    let printable_name = {
+        if display_data.short_paths {
+            dir_name
+                .split(std::path::is_separator)
+                .last()
+                .unwrap_or(dir_name)
+        } else {
+            dir_name
+        }
+    };
+    format!(
+        "{} {} {}",
+        if is_biggest && display_data.colors_on {
+            Fixed(196).paint(size)
+        } else {
+            Style::new().paint(size)
+        },
+        indentation,
+        printable_name,
+    )
+}
+
+fn human_readable_number(size: u64) -> String {
+    for (i, u) in UNITS.iter().enumerate() {
+        let marker = 1024u64.pow((UNITS.len() - i) as u32);
+        if size >= marker {
+            if size / marker < 10 {
+                return format!("{:.1}{}", (size as f32 / marker as f32), u);
+            } else {
+                return format!("{}{}", (size / marker), u);
+            }
+        }
+    }
+    return format!("{}B", size);
+}
+
+mod tests {
+    #[allow(unused_imports)]
+    use super::*;
+
+    #[test]
+    fn test_human_readable_number() {
+        assert_eq!(human_readable_number(1), "1B");
+        assert_eq!(human_readable_number(956), "956B");
+        assert_eq!(human_readable_number(1004), "1004B");
+        assert_eq!(human_readable_number(1024), "1.0K");
+        assert_eq!(human_readable_number(1536), "1.5K");
+        assert_eq!(human_readable_number(1024 * 512), "512K");
+        assert_eq!(human_readable_number(1024 * 1024), "1.0M");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 - 1), "1023M");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 20), "20G");
+        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 1024), "1.0T");
+    }
+}
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,364 +1,201 @@
-// test:
-// recursive dirs that link to each other.
-// Pass in bad dir name
-// num to search for is less than num available
-// admin files.
-//
-extern crate ansi_term;
 #[macro_use]
 extern crate clap;

-use std::collections::HashSet;
-
-use ansi_term::Colour::Fixed;
+use self::display::draw_it;
+use crate::utils::is_a_parent_of;
 use clap::{App, AppSettings, Arg};
+use utils::{find_big_ones, get_dir_tree, simplify_dir_names, sort, trim_deep_ones, Node};

-use std::cmp;
-use std::cmp::Ordering;
-use std::fs;
-use std::fs::ReadDir;
-use std::io;
+mod display;
+mod utils;

-#[derive(Clone, Debug)]
-struct Node {
-    dir: Dir,
-    children: Vec<Node>,
-}
-impl Ord for Node {
-    fn cmp(&self, other: &Self) -> Ordering {
-        if self.dir.size > other.dir.size {
-            Ordering::Less
-        } else if self.dir.size < other.dir.size {
-            Ordering::Greater
-        } else {
-            let my_slashes = self.dir.name.matches("/").count();
-            let other_slashes = other.dir.name.matches("/").count();
+static DEFAULT_NUMBER_OF_LINES: usize = 20;

-            if my_slashes > other_slashes {
-                Ordering::Greater
-            } else if my_slashes < other_slashes {
-                Ordering::Less
-            } else {
-                if self.dir.name < other.dir.name {
-                    Ordering::Less
-                } else if self.dir.name > other.dir.name {
-                    Ordering::Greater
-                } else {
-                    Ordering::Equal
-                }
-            }
-        }
-    }
-}
-impl PartialOrd for Node {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-impl PartialEq for Node {
-    fn eq(&self, other: &Self) -> bool {
-        (&self.dir.name, self.dir.size) == (&other.dir.name, other.dir.size)
-    }
-}
-impl Eq for Node {}
-
-#[derive(Clone, Debug)]
-struct Dir {
-    name: String,
-    size: u64,
+#[cfg(windows)]
+fn init_color() {
+    ansi_term::enable_ansi_support().expect("Couldn't enable color support");
 }

-static DEFAULT_NUMBER_OF_LINES: &'static str = &"15";
+#[cfg(not(windows))]
+fn init_color() {}

 fn main() {
-    let options = App::new("Trailing args example")
+    init_color();
+    let def_num_str = DEFAULT_NUMBER_OF_LINES.to_string();
+    let options = App::new("Dust")
+        .about("Like du but more intuitive")
+        .version(crate_version!())
        .setting(AppSettings::TrailingVarArg)
+        .arg(
+            Arg::with_name("depth")
+                .short("d")
+                .long("depth")
+                .help("Depth to show")
+                .takes_value(true),
+        )
+        .arg(
+            Arg::with_name("threads")
+                .short("t")
+                .long("threads")
+                .help("Number of threads to spawn simultaneously")
+                .takes_value(true),
+        )
        .arg(
            Arg::with_name("number_of_lines")
                .short("n")
+                .long("number-of-lines")
                .help("Number of lines of output to show")
                .takes_value(true)
-                .default_value(DEFAULT_NUMBER_OF_LINES),
+                .default_value(def_num_str.as_ref()),
+        )
+        .arg(
+            Arg::with_name("display_full_paths")
+                .short("p")
+                .long("full-paths")
+                .help("If set sub directories will not have their path shortened"),
+        )
+        .arg(
+            Arg::with_name("ignore_directory")
+                .short("X")
+                .long("ignore-directory")
+                .takes_value(true)
+                .number_of_values(1)
+                .multiple(true)
+                .help("Exclude any file or directory with contains this substring."),
+        )
+        .arg(
+            Arg::with_name("limit_filesystem")
+                .short("x")
+                .long("limit-filesystem")
+                .help("Only count the files and directories in the same filesystem as the supplied directory"),
+        )
+        .arg(
+            Arg::with_name("display_apparent_size")
+                .short("s")
+                .long("apparent-size")
+                .help("If set will use file length. Otherwise we use blocks"),
+        )
+        .arg(
+            Arg::with_name("reverse")
+                .short("r")
+                .long("reverse")
+                .help("If applied tree will be printed upside down (biggest lowest)"),
+        )
+        .arg(
+            Arg::with_name("no_colors")
+                .short("c")
+                .long("no_colors")
+                .help("If applied no colors will be printed (normally largest directories are marked in red"),
        )
        .arg(Arg::with_name("inputs").multiple(true))
        .get_matches();

-    let filenames = {
+    let target_dirs = {
        match options.values_of("inputs") {
            None => vec!["."],
            Some(r) => r.collect(),
        }
    };
-    let number_of_lines = value_t!(options.value_of("number_of_lines"), usize).unwrap();

-    let (permissions, results) = get_dir_tree(filenames);
-    let slice_it = find_big_ones(&results, number_of_lines);
-    display(permissions, slice_it);
-}
-
-fn get_dir_tree(filenames: Vec<&str>) -> (bool, Vec<Node>) {
-    let mut permissions = true;
-    let mut results = vec![];
-    for b in filenames {
-        let mut new_name = String::from(b);
-        while new_name.chars().last() == Some('/') && new_name.len() != 1 {
-            new_name.pop();
+    let number_of_lines = match value_t!(options.value_of("number_of_lines"), usize) {
+        Ok(v) => v,
+        Err(_) => {
+            eprintln!("Ignoring bad value for number_of_lines");
+            DEFAULT_NUMBER_OF_LINES
        }
-        let (hp, data) = examine_dir_str(new_name);
-        permissions = permissions && hp;
-        results.push(data);
-    }
-    (permissions, results)
-}
+    };

-fn examine_dir_str(loc: String) -> (bool, Node) {
-    let mut inodes: HashSet<u64> = HashSet::new();
-    let (hp, result) = examine_dir(fs::read_dir(&loc), &mut inodes);
-
-    // This needs to be folded into the below recursive call somehow
-    let new_size = result.iter().fold(0, |a, b| a + b.dir.size);
-    (
-        hp,
-        Node {
-            dir: Dir {
-                name: loc,
-                size: new_size,
-            },
-            children: result,
-        },
-    )
-}
-
-#[cfg(target_os = "linux")]
-fn get_metadata_blocks_and_inode(d: &std::fs::DirEntry) -> Option<(u64, u64)> {
-    use std::os::linux::fs::MetadataExt;
-    match d.metadata().ok() {
-        Some(md) => Some((md.len(), md.st_ino())),
-        None => None,
-    }
-}
-
-#[cfg(target_os = "unix")]
-fn get_metadata_blocks_and_inode(d: &std::fs::DirEntry) -> Option<(u64, u64)> {
-    use std::os::unix::fs::MetadataExt;
-    match d.metadata().ok() {
-        Some(md) => Some((md.len(), md.ino())),
-        None => None,
-    }
-}
-
-#[cfg(target_os = "macos")]
-fn get_metadata_blocks_and_inode(d: &std::fs::DirEntry) -> Option<(u64, u64)> {
-    use std::os::macos::fs::MetadataExt;
-    match d.metadata().ok() {
-        Some(md) => Some((md.len(), md.st_ino())),
-        None => None,
-    }
-}
-
-#[cfg(not(any(target_os = "linux", target_os = "unix", target_os = "macos")))]
-fn get_metadata_blocks_and_inode(_d: &std::fs::DirEntry) -> Option<(u64, u64)> {
-    match _d.metadata().ok() {
-        Some(md) => Some((md.len(), 0)), //move to option not 0
-        None => None,
-    }
-}
-
-fn examine_dir(a_dir: io::Result<ReadDir>, inodes: &mut HashSet<u64>) -> (bool, Vec<Node>) {
-    let mut result = vec![];
-    let mut have_permission = true;
-
-    if a_dir.is_ok() {
-        let paths = a_dir.unwrap();
-        for dd in paths {
-            match dd {
-                Ok(d) => {
-                    let file_type = d.file_type().ok();
-                    let maybe_size_and_inode = get_metadata_blocks_and_inode(&d);
-
-                    match (file_type, maybe_size_and_inode) {
-                        (Some(file_type), Some((size, inode))) => {
-                            let s = d.path().to_string_lossy().to_string();
-                            if inodes.contains(&inode) {
-                                continue;
-                            }
-                            inodes.insert(inode);
-
-                            if d.path().is_dir() && !file_type.is_symlink() {
-                                let (hp, recursive) = examine_dir(fs::read_dir(d.path()), inodes);
-                                have_permission = have_permission && hp;
-                                let new_size = recursive.iter().fold(size, |a, b| a + b.dir.size);
-                                result.push(Node {
-                                    dir: Dir {
-                                        name: s,
-                                        size: new_size,
-                                    },
-                                    children: recursive,
-                                })
-                            } else {
-                                result.push(Node {
-                                    dir: Dir {
-                                        name: s,
-                                        size: size,
-                                    },
-                                    children: vec![],
-                                })
-                            }
-                        }
-                        (_, None) => have_permission = false,
-                        (_, _) => (),
-                    }
-                }
-                Err(_) => (),
-            }
-        }
-    } else {
-        have_permission = false;
-    }
-    (have_permission, result)
-}
-
-// We start with a list of root directories - these must be the biggest folders
-// We then repeadedly merge in the children of the biggest directory - Each iteration
-// the next biggest directory's children are merged in.
-fn find_big_ones<'a>(l: &'a Vec<Node>, max_to_show: usize) -> Vec<&Node> {
-    let mut new_l: Vec<&Node> = l.iter().map(|a| a).collect();
-    new_l.sort();
-
-    for processed_pointer in 0..max_to_show {
-        if new_l.len() == processed_pointer {
-            break;
-        }
-        // Must be a list of pointers into new_l otherwise b_list will go out of scope
-        // when it is deallocated
-        let mut b_list: Vec<&Node> = new_l[processed_pointer]
-            .children
-            .iter()
-            .map(|a| a)
-            .collect();
-        new_l.extend(b_list);
-        new_l.sort();
-        /*println!(
-            "{:?} -------------------",
-            new_l
-                .iter()
-                .map(|a| a.dir.size.to_string() + ": " + &a.dir.name)
-                .collect::<Vec<String>>()
-        );*/
-    }
-    if new_l.len() > max_to_show {
-        new_l[0..max_to_show + 1].to_vec()
-    } else {
-        new_l
-    }
-}
-
-fn display(permissions: bool, to_display: Vec<&Node>) -> () {
-    if !permissions {
-        eprintln!("Did not have permissions for all directories");
-    }
-
-    display_node(to_display[0], &to_display, true, 1, "")
-}
-
-fn display_node<S: Into<String>>(
-    node_to_print: &Node,
-    to_display: &Vec<&Node>,
-    is_first: bool,
-    depth: u8,
-    indentation_str: S,
-) {
-    let mut is = indentation_str.into();
-    print_this_node(node_to_print, is_first, depth, is.as_ref());
-
-    is = is.replace("└──", "   ");
-    is = is.replace("├──", "│  ");
-
-    let printable_node_slashes = node_to_print.dir.name.matches("/").count();
-
-    let mut num_sibblings = to_display.iter().fold(0, |a, b| {
-        if node_to_print.children.contains(b)
-            && b.dir.name.matches("/").count() == printable_node_slashes + 1
-        {
-            a + 1
-        } else {
-            a
-        }
+    let temp_threads = options.value_of("threads").and_then(|threads| {
+        threads
+            .parse::<usize>()
+            .map_err(|_| eprintln!("Ignoring bad value for threads: {:?}", threads))
+            .ok()
    });
-
-    let mut is_biggest = true;
-    for node in to_display {
-        if node_to_print.children.contains(node) {
-            if node.dir.name.matches("/").count() == printable_node_slashes + 1 {
-                num_sibblings -= 1;
-                let tree_chars = {
-                    if num_sibblings == 0 {
-                        "└──"
-                    } else {
-                        "├──"
-                    }
-                };
-                display_node(
-                    &node,
-                    to_display,
-                    is_biggest,
-                    depth + 1,
-                    is.to_string() + tree_chars,
-                );
-                is_biggest = false;
-            }
-        }
-    }
-}
-
-fn print_this_node(node_to_print: &Node, is_biggest: bool, depth: u8, indentation_str: &str) {
-    let padded_size = format!("{:>5}", human_readable_number(node_to_print.dir.size),);
-    println!(
-        "{} {} {}",
-        if is_biggest {
-            Fixed(196).paint(padded_size)
+    // Bug in JWalk
+    // https://github.com/jessegrosjean/jwalk/issues/15
+    // We force it to use 2 threads if there is only 1 cpu
+    // as JWalk breaks if it tries to run on a single cpu
+    let threads = {
+        if temp_threads.is_none() && num_cpus::get() == 1 {
+            Some(2)
        } else {
-            Fixed(7).paint(padded_size)
-        },
-        indentation_str,
-        Fixed(7)
-            .on(Fixed(cmp::min(8, (depth) as u8) + 231))
-            .paint(node_to_print.dir.name.to_string())
+            temp_threads
+        }
+    };
+
+    let depth = options.value_of("depth").and_then(|depth| {
+        depth
+            .parse::<u64>()
+            .map(|v| v + 1)
+            .map_err(|_| eprintln!("Ignoring bad value for depth"))
+            .ok()
+    });
+    if options.is_present("depth") && number_of_lines != DEFAULT_NUMBER_OF_LINES {
+        eprintln!("Use either -n or -d. Not both");
+        return;
+    }
+
+    let use_apparent_size = options.is_present("display_apparent_size");
+    let limit_filesystem = options.is_present("limit_filesystem");
+    let ignore_directories = options.values_of("ignore_directory").map(|r| r.collect());
+
+    let simplified_dirs = simplify_dir_names(target_dirs);
+    let (permissions, nodes) = get_dir_tree(
+        &simplified_dirs,
+        ignore_directories,
+        use_apparent_size,
+        limit_filesystem,
+        threads,
+    );
+    let sorted_data = sort(nodes);
+    let biggest_ones = {
+        match depth {
+            None => find_big_ones(sorted_data, number_of_lines + simplified_dirs.len()),
+            Some(d) => trim_deep_ones(sorted_data, d, &simplified_dirs),
+        }
+    };
+    let tree = build_tree(biggest_ones, depth);
+
+    draw_it(
+        permissions,
+        options.is_present("display_full_paths"),
+        options.is_present("reverse"),
+        options.is_present("no_colors"),
+        tree,
    );
 }

-fn human_readable_number(size: u64) -> (String) {
-    let units = vec!["T", "G", "M", "K"]; //make static
+fn build_tree(biggest_ones: Vec<(String, u64)>, depth: Option<u64>) -> Node {
+    let mut top_parent = Node::default();

-    //return format!("{}B", size);
-
-    for (i, u) in units.iter().enumerate() {
-        let marker = 1024u64.pow((units.len() - i) as u32);
-        if size >= marker {
-            if size / marker < 10 {
-                return format!("{:.1}{}", (size as f32 / marker as f32), u);
-            } else {
-                return format!("{}{}", (size / marker), u);
-            }
-        }
+    // assume sorted order
+    for b in biggest_ones {
+        let n = Node {
+            name: b.0,
+            size: b.1,
+            children: Vec::default(),
+        };
+        recursively_build_tree(&mut top_parent, n, depth);
    }
-    return format!("{}B", size);
+    top_parent
 }

-mod tests {
-    use super::*;
-
-    #[test]
-    fn test_human_readable_number() {
-        assert_eq!(human_readable_number(1), "1B");
-        assert_eq!(human_readable_number(956), "956B");
-        assert_eq!(human_readable_number(1004), "1004B");
-        assert_eq!(human_readable_number(1024), "1.0K");
-        assert_eq!(human_readable_number(1536), "1.5K");
-        assert_eq!(human_readable_number(1024 * 512), "512K");
-        assert_eq!(human_readable_number(1024 * 1024), "1.0M");
-        assert_eq!(human_readable_number(1024 * 1024 * 1024 - 1), "1023M");
-        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 20), "20G");
-        assert_eq!(human_readable_number(1024 * 1024 * 1024 * 1024), "1.0T");
+fn recursively_build_tree(parent_node: &mut Node, new_node: Node, depth: Option<u64>) {
+    let new_depth = match depth {
+        None => None,
+        Some(0) => return,
+        Some(d) => Some(d - 1),
+    };
+    if let Some(c) = parent_node
+        .children
+        .iter_mut()
+        .find(|c| is_a_parent_of(&c.name, &new_node.name))
+    {
+        recursively_build_tree(c, new_node, new_depth);
+    } else {
+        parent_node.children.push(new_node);
    }
 }
+
+#[cfg(test)]
+mod tests;
--- a/src/test_dir/many/a_file
+++ b/src/test_dir/many/a_file
--- a/src/test_dir/many/hello_file
+++ b/src/test_dir/many/hello_file
@@ -0,0 +1 @@
+hello
--- a/src/test_dir2/dir/hello
+++ b/src/test_dir2/dir/hello
@@ -0,0 +1 @@
+hello
--- a/src/test_dir2/dir_name_clash
+++ b/src/test_dir2/dir_name_clash
@@ -0,0 +1 @@
+hello
--- a/src/test_dir2/dir_substring/hello
+++ b/src/test_dir2/dir_substring/hello
@@ -0,0 +1 @@
+hello
--- a/src/tests.rs
+++ b/src/tests.rs
@@ -0,0 +1,412 @@
+use super::*;
+
+use crate::display::DisplayData;
+use display::format_string;
+use std::fs::File;
+use std::io::Write;
+use std::panic;
+use std::path::PathBuf;
+use std::process::Command;
+use tempfile::Builder;
+use tempfile::TempDir;
+
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_main() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["src/test_dir"])
+        .stdout()
+        .is(main_output(true).as_str())
+        .unwrap();
+}
+
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_main_long_paths() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["-p", "src/test_dir"])
+        .stdout()
+        .is(main_output(false).as_str())
+        .unwrap();
+}
+
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_main_multi_arg() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["src/test_dir/many/", "src/test_dir/", "src/test_dir"])
+        .stdout()
+        .is(main_output(true).as_str())
+        .unwrap();
+}
+
+#[cfg(target_os = "macos")]
+fn main_output(short_paths: bool) -> String {
+    let d = DisplayData {
+        short_paths,
+        is_reversed: false,
+        colors_on: true,
+    };
+    format!(
+        "{}
+{}
+{}
+{}",
+        format_string("src/test_dir", true, &d, " 4.0K", "─┬"),
+        format_string("src/test_dir/many", true, &d, " 4.0K", " └─┬",),
+        format_string("src/test_dir/many/hello_file", true, &d, " 4.0K", "   ├──",),
+        format_string("src/test_dir/many/a_file", false, &d, "   0B", "   └──",),
+    )
+}
+
+#[cfg(target_os = "linux")]
+fn main_output(short_paths: bool) -> String {
+    let d = DisplayData {
+        short_paths,
+        is_reversed: false,
+        colors_on: true,
+    };
+    format!(
+        "{}
+{}
+{}
+{}",
+        format_string("src/test_dir", true, &d, "  12K", "─┬"),
+        format_string("src/test_dir/many", true, &d, " 8.0K", " └─┬",),
+        format_string("src/test_dir/many/hello_file", true, &d, " 4.0K", "   ├──",),
+        format_string("src/test_dir/many/a_file", false, &d, "   0B", "   └──",),
+    )
+}
+
+#[cfg(target_os = "windows")]
+fn main_output(short_paths: bool) -> String {
+    let d = DisplayData {
+        short_paths,
+        is_reversed: false,
+        colors_on: true,
+    };
+    format!(
+        "{}
+{}
+{}
+{}",
+        format_string("src/test_dir", true, &d, "   6B", "─┬"),
+        format_string("src/test_dir\\many", true, &d, "   6B", " └─┬",),
+        format_string(
+            "src/test_dir\\many\\hello_file",
+            true,
+            &d,
+            "   6B",
+            "   ├──",
+        ),
+        format_string("src/test_dir\\many\\a_file", false, &d, "   0B", "   └──",),
+    )
+}
+
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_no_color_flag() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["-c", "src/test_dir/"])
+        .stdout()
+        .is(no_color_flag_output().as_str())
+        .unwrap();
+}
+
+#[cfg(target_os = "macos")]
+fn no_color_flag_output() -> String {
+    "
+ 4.0K ─┬ test_dir
+ 4.0K  └─┬ many
+ 4.0K    ├── hello_file
+   0B    └── a_file
+    "
+    .to_string()
+}
+
+#[cfg(target_os = "linux")]
+fn no_color_flag_output() -> String {
+    "
+  12K ─┬ test_dir
+ 8.0K  └─┬ many
+ 4.0K    ├── hello_file
+   0B    └── a_file
+    "
+    .to_string()
+}
+
+#[cfg(target_os = "windows")]
+fn no_color_flag_output() -> String {
+    "
+   6B ─┬ test_dir
+   6B  └─┬ many
+   6B    ├── hello_file
+   0B    └── a_file
+    "
+    .to_string()
+}
+
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_apparent_size() {
+    let d = DisplayData {
+        short_paths: true,
+        is_reversed: false,
+        colors_on: true,
+    };
+    let r = format!(
+        "{}",
+        format_string("src/test_dir/many/hello_file", true, &d, "   6B", "   ├──",),
+    );
+
+    assert_cli::Assert::main_binary()
+        .with_args(&["-s", "src/test_dir"])
+        .stdout()
+        .contains(r.as_str())
+        .unwrap();
+}
+
+#[test]
+pub fn test_reverse_flag() {
+    // variable names the same length make the output easier to read
+    let a = "    ┌── a_file";
+    let b = "    ├── hello_file";
+    let c = "  ┌─┴ many";
+    let d = " ─┴ test_dir";
+
+    assert_cli::Assert::main_binary()
+        .with_args(&["-r", "src/test_dir"])
+        .stdout()
+        .contains(a)
+        .stdout()
+        .contains(b)
+        .stdout()
+        .contains(c)
+        .stdout()
+        .contains(d)
+        .unwrap();
+}
+
+#[test]
+pub fn test_d_flag_works() {
+    // We should see the top level directory but not the sub dirs / files:
+    assert_cli::Assert::main_binary()
+        .with_args(&["-d", "1", "-s", "src/test_dir"])
+        .stdout()
+        .doesnt_contain("hello_file")
+        .unwrap();
+}
+
+fn build_temp_file(dir: &TempDir) -> PathBuf {
+    let file_path = dir.path().join("notes.txt");
+    let mut file = File::create(&file_path).unwrap();
+    writeln!(file, "I am a temp file").unwrap();
+    file_path
+}
+
+// fix! [rivy; 2020-01-22] possible on "windows"?; `ln` is not usually an available command; creation of symbolic links requires special enhanced permissions
+//  ... ref: <https://superuser.com/questions/343074/directory-junction-vs-directory-symbolic-link> @@ <https://archive.is/gpTLE>
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_soft_sym_link() {
+    let dir = Builder::new().tempdir().unwrap();
+    let file = build_temp_file(&dir);
+    let dir_s = dir.path().to_str().unwrap();
+    let file_path_s = file.to_str().unwrap();
+
+    let link_name = dir.path().join("the_link");
+    let link_name_s = link_name.to_str().unwrap();
+    let c = Command::new("ln")
+        .arg("-s")
+        .arg(file_path_s)
+        .arg(link_name_s)
+        .output();
+    assert!(c.is_ok());
+
+    let a = format!(" ─┬ {}", dir_s);
+    let b = format!("  ├── {}", file_path_s);
+    let c = format!("  └── {}", link_name_s);
+
+    assert_cli::Assert::main_binary()
+        .with_args(&["-p", &dir_s])
+        .stdout()
+        .contains(a.as_str())
+        .stdout()
+        .contains(b.as_str())
+        .stdout()
+        .contains(c.as_str())
+        .unwrap();
+}
+
+// Hard links are ignored as the inode is the same as the file
+// fix! [rivy; 2020-01-22] may fail on "usual" windows hosts as `ln` is not usually an available command
+#[test]
+pub fn test_hard_sym_link() {
+    let dir = Builder::new().tempdir().unwrap();
+    let file = build_temp_file(&dir);
+    let dir_s = dir.path().to_str().unwrap();
+    let file_path_s = file.to_str().unwrap();
+
+    let link_name = dir.path().join("the_link");
+    let link_name_s = link_name.to_str().unwrap();
+    let c = Command::new("ln")
+        .arg(file_path_s)
+        .arg(link_name_s)
+        .output();
+    assert!(c.is_ok());
+
+    let a = format!(" ─┬ {}", dir_s);
+    let b = format!("  └── {}", link_name_s);
+    let b2 = format!("  └── {}", file_path_s);
+
+    // Because this is a hard link the file and hard link look identical. Therefore
+    // we cannot guarantee which version will appear first.
+    let result = panic::catch_unwind(|| {
+        assert_cli::Assert::main_binary()
+            .with_args(&["-p", dir_s])
+            .stdout()
+            .contains(a.as_str())
+            .stdout()
+            .contains(b.as_str())
+            .unwrap();
+    });
+    if result.is_err() {
+        assert_cli::Assert::main_binary()
+            .with_args(&["-p", dir_s])
+            .stdout()
+            .contains(a.as_str())
+            .stdout()
+            .contains(b2.as_str())
+            .unwrap();
+    }
+}
+
+// Check we don't recurse down an infinite symlink tree
+// fix! [rivy; 2020-01-22] possible on "windows"?; `ln` is not usually an available command; creation of symbolic links requires special enhanced permissions
+//  ... ref: <https://superuser.com/questions/343074/directory-junction-vs-directory-symbolic-link> @@ <https://archive.is/gpTLE>
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_recursive_sym_link() {
+    let dir = Builder::new().tempdir().unwrap();
+    let dir_s = dir.path().to_str().unwrap();
+
+    let link_name = dir.path().join("the_link");
+    let link_name_s = link_name.to_str().unwrap();
+
+    let c = Command::new("ln")
+        .arg("-s")
+        .arg(dir_s)
+        .arg(link_name_s)
+        .output();
+    assert!(c.is_ok());
+
+    let a = format!(" ─┬ {}", dir_s);
+    let b = format!("  └── {}", link_name_s);
+
+    assert_cli::Assert::main_binary()
+        .with_args(&["-p", dir_s])
+        .stdout()
+        .contains(a.as_str())
+        .stdout()
+        .contains(b.as_str())
+        .unwrap();
+}
+
+// Check against directories and files whos names are substrings of each other
+// fix! [rivy; 2020-22-01] "windows" result data can vary by host (size seems to be variable by one byte); fix code vs test and re-enable
+#[cfg_attr(target_os = "windows", ignore)]
+#[test]
+pub fn test_substring_of_names() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["-c", "src/test_dir2"])
+        .stdout()
+        .is(no_substring_of_names_output().as_str())
+        .unwrap();
+}
+
+#[cfg(target_os = "linux")]
+fn no_substring_of_names_output() -> String {
+    "
+  24K ─┬ test_dir2
+ 8.0K  ├─┬ dir
+ 4.0K  │ └── hello
+ 8.0K  ├─┬ dir_substring
+ 4.0K  │ └── hello
+ 4.0K  └── dir_name_clash
+    "
+    .into()
+}
+
+#[cfg(target_os = "macos")]
+fn no_substring_of_names_output() -> String {
+    "
+  12K ─┬ test_dir2
+ 4.0K  ├─┬ dir
+ 4.0K  │ └── hello
+ 4.0K  ├── dir_name_clash
+ 4.0K  └─┬ dir_substring
+ 4.0K    └── hello
+    "
+    .into()
+}
+
+#[cfg(target_os = "windows")]
+fn no_substring_of_names_output() -> String {
+    "
+  16B ─┬ test_dir2
+   6B  ├─┬ dir_substring
+   6B  │ └── hello
+   5B  ├─┬ dir
+   5B  │ └── hello
+   5B  └── dir_name_clash
+    "
+    .into()
+}
+
+// Check against directories and files whos names are substrings of each other
+#[test]
+pub fn test_ignore_dir() {
+    assert_cli::Assert::main_binary()
+        .with_args(&["-c", "-X", "dir_substring", "src/test_dir2"])
+        .stdout()
+        .is(ignore_dir_output().as_str())
+        .unwrap();
+}
+
+#[cfg(target_os = "linux")]
+fn ignore_dir_output() -> String {
+    "
+  16K ─┬ test_dir2
+ 8.0K  ├─┬ dir
+ 4.0K  │ └── hello
+ 4.0K  └── dir_name_clash
+    "
+    .into()
+}
+
+#[cfg(target_os = "macos")]
+fn ignore_dir_output() -> String {
+    "
+ 8.0K ─┬ test_dir2
+ 4.0K  ├─┬ dir
+ 4.0K  │ └── hello
+ 4.0K  └── dir_name_clash
+    "
+    .into()
+}
+
+#[cfg(target_os = "windows")]
+fn ignore_dir_output() -> String {
+    "
+  10B ─┬ test_dir2
+   5B  ├─┬ dir
+   5B  │ └── hello
+   5B  └── dir_name_clash
+    "
+    .into()
+}
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -0,0 +1,363 @@
+use jwalk::DirEntry;
+use std::cmp::Ordering;
+use std::collections::HashMap;
+use std::collections::HashSet;
+
+use jwalk::WalkDir;
+
+mod platform;
+use self::platform::*;
+
+#[derive(Debug, Default, Eq)]
+pub struct Node {
+    pub name: String,
+    pub size: u64,
+    pub children: Vec<Node>,
+}
+
+impl Ord for Node {
+    fn cmp(&self, other: &Self) -> Ordering {
+        if self.size == other.size {
+            self.name.cmp(&other.name)
+        } else {
+            self.size.cmp(&other.size)
+        }
+    }
+}
+
+impl PartialOrd for Node {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl PartialEq for Node {
+    fn eq(&self, other: &Self) -> bool {
+        self.name == other.name && self.size == other.size && self.children == other.children
+    }
+}
+
+pub fn is_a_parent_of(parent: &str, child: &str) -> bool {
+    let path_parent = std::path::Path::new(parent);
+    let path_child = std::path::Path::new(child);
+    (path_child.starts_with(path_parent) && !path_parent.starts_with(path_child))
+}
+
+pub fn simplify_dir_names(filenames: Vec<&str>) -> HashSet<String> {
+    let mut top_level_names: HashSet<String> = HashSet::with_capacity(filenames.len());
+    let mut to_remove: Vec<String> = Vec::with_capacity(filenames.len());
+
+    for t in filenames {
+        let top_level_name = normalize_path(t);
+        let mut can_add = true;
+
+        for tt in top_level_names.iter() {
+            if is_a_parent_of(&top_level_name, tt) {
+                to_remove.push(tt.to_string());
+            } else if is_a_parent_of(tt, &top_level_name) {
+                can_add = false;
+            }
+        }
+        to_remove.sort_unstable();
+        top_level_names.retain(|tr| to_remove.binary_search(tr).is_err());
+        to_remove.clear();
+        if can_add {
+            top_level_names.insert(normalize_path(t).to_owned());
+        }
+    }
+
+    top_level_names
+}
+
+pub fn get_dir_tree(
+    top_level_names: &HashSet<String>,
+    ignore_directories: Option<Vec<&str>>,
+    apparent_size: bool,
+    limit_filesystem: bool,
+    threads: Option<usize>,
+) -> (bool, HashMap<String, u64>) {
+    let mut permissions = 0;
+    let mut data: HashMap<String, u64> = HashMap::new();
+    let restricted_filesystems = if limit_filesystem {
+        get_allowed_filesystems(top_level_names)
+    } else {
+        None
+    };
+
+    for b in top_level_names.iter() {
+        examine_dir(
+            &b,
+            apparent_size,
+            &restricted_filesystems,
+            &ignore_directories,
+            &mut data,
+            &mut permissions,
+            threads,
+        );
+    }
+    (permissions == 0, data)
+}
+
+fn get_allowed_filesystems(top_level_names: &HashSet<String>) -> Option<HashSet<u64>> {
+    let mut limit_filesystems: HashSet<u64> = HashSet::new();
+    for file_name in top_level_names.iter() {
+        if let Ok(a) = get_filesystem(file_name) {
+            limit_filesystems.insert(a);
+        }
+    }
+    Some(limit_filesystems)
+}
+
+pub fn normalize_path<P: AsRef<std::path::Path>>(path: P) -> std::string::String {
+    // normalize path ...
+    // 1. removing repeated separators
+    // 2. removing interior '.' ("current directory") path segments
+    // 3. removing trailing extra separators and '.' ("current directory") path segments
+    // * `Path.components()` does all the above work; ref: <https://doc.rust-lang.org/std/path/struct.Path.html#method.components>
+    // 4. changing to os preferred separator (automatically done by recollecting components back into a PathBuf)
+    path.as_ref()
+        .components()
+        .collect::<std::path::PathBuf>()
+        .to_string_lossy()
+        .to_string()
+}
+
+fn examine_dir(
+    top_dir: &str,
+    apparent_size: bool,
+    filesystems: &Option<HashSet<u64>>,
+    ignore_directories: &Option<Vec<&str>>,
+    data: &mut HashMap<String, u64>,
+    file_count_no_permission: &mut u64,
+    threads: Option<usize>,
+) {
+    let mut inodes: HashSet<(u64, u64)> = HashSet::new();
+    let mut iter = WalkDir::new(top_dir)
+        .preload_metadata(true)
+        .skip_hidden(false);
+    if let Some(threads_to_start) = threads {
+        iter = iter.num_threads(threads_to_start);
+    }
+    'entry: for entry in iter {
+        if let Ok(e) = entry {
+            let maybe_size_and_inode = get_metadata(&e, apparent_size);
+            if let Some(d) = ignore_directories {
+                for s in d {
+                    if e.path().to_string_lossy().contains(*s) {
+                        continue 'entry;
+                    }
+                }
+            }
+
+            match maybe_size_and_inode {
+                Some((size, maybe_inode)) => {
+                    if !should_ignore_file(apparent_size, filesystems, &mut inodes, maybe_inode) {
+                        process_file_with_size_and_inode(top_dir, data, e, size)
+                    }
+                }
+                None => *file_count_no_permission += 1,
+            }
+        } else {
+            *file_count_no_permission += 1
+        }
+    }
+}
+
+fn should_ignore_file(
+    apparent_size: bool,
+    restricted_filesystems: &Option<HashSet<u64>>,
+    inodes: &mut HashSet<(u64, u64)>,
+    maybe_inode: Option<(u64, u64)>,
+) -> bool {
+    if !apparent_size {
+        if let Some(inode_dev_pair) = maybe_inode {
+            // Ignore files on different devices (if flag applied)
+            if restricted_filesystems.is_some()
+                && !restricted_filesystems
+                    .as_ref()
+                    .unwrap()
+                    .contains(&inode_dev_pair.1)
+            {
+                return true;
+            }
+            // Ignore files already visited or symlinked
+            if inodes.contains(&inode_dev_pair) {
+                return true;
+            }
+            inodes.insert(inode_dev_pair);
+        }
+    }
+    false
+}
+
+fn process_file_with_size_and_inode(
+    top_dir: &str,
+    data: &mut HashMap<String, u64>,
+    e: DirEntry,
+    size: u64,
+) {
+    // This path and all its parent paths have their counter incremented
+    for path_name in e.path().ancestors() {
+        // This is required due to bug in Jwalk that adds '/' to all sub dir lists
+        // see: https://github.com/jessegrosjean/jwalk/issues/13
+        if path_name.to_string_lossy() == "/" && top_dir != "/" {
+            continue;
+        }
+        let path_name = path_name.to_string_lossy();
+        let s = data.entry(path_name.to_string()).or_insert(0);
+        *s += size;
+        if path_name == top_dir {
+            break;
+        }
+    }
+}
+
+pub fn sort_by_size_first_name_second(a: &(String, u64), b: &(String, u64)) -> Ordering {
+    let result = b.1.cmp(&a.1);
+    if result == Ordering::Equal {
+        a.0.cmp(&b.0)
+    } else {
+        result
+    }
+}
+
+pub fn sort(data: HashMap<String, u64>) -> Vec<(String, u64)> {
+    let mut new_l: Vec<(String, u64)> = data.iter().map(|(a, b)| (a.clone(), *b)).collect();
+    new_l.sort_unstable_by(sort_by_size_first_name_second);
+    new_l
+}
+
+pub fn find_big_ones(new_l: Vec<(String, u64)>, max_to_show: usize) -> Vec<(String, u64)> {
+    if max_to_show > 0 && new_l.len() > max_to_show {
+        new_l[0..max_to_show].to_vec()
+    } else {
+        new_l
+    }
+}
+
+pub fn trim_deep_ones(
+    input: Vec<(String, u64)>,
+    max_depth: u64,
+    top_level_names: &HashSet<String>,
+) -> Vec<(String, u64)> {
+    let mut result: Vec<(String, u64)> = Vec::with_capacity(input.len() * top_level_names.len());
+
+    for name in top_level_names {
+        let my_max_depth = name.matches(std::path::is_separator).count() + max_depth as usize;
+        let name_ref: &str = name.as_ref();
+
+        for &(ref k, ref v) in input.iter() {
+            if k.starts_with(name_ref) && k.matches(std::path::is_separator).count() <= my_max_depth
+            {
+                result.push((k.clone(), *v));
+            }
+        }
+    }
+    result
+}
+
+mod tests {
+    #[allow(unused_imports)]
+    use super::*;
+
+    #[test]
+    fn test_simplify_dir() {
+        let mut correct = HashSet::new();
+        correct.insert("a".to_string());
+        assert_eq!(simplify_dir_names(vec!["a"]), correct);
+    }
+
+    #[test]
+    fn test_simplify_dir_rm_subdir() {
+        let mut correct = HashSet::new();
+        correct.insert(
+            ["a", "b"]
+                .iter()
+                .collect::<std::path::PathBuf>()
+                .to_string_lossy()
+                .to_string(),
+        );
+        assert_eq!(simplify_dir_names(vec!["a/b", "a/b/c", "a/b/d/f"]), correct);
+    }
+
+    #[test]
+    fn test_simplify_dir_duplicates() {
+        let mut correct = HashSet::new();
+        correct.insert(
+            ["a", "b"]
+                .iter()
+                .collect::<std::path::PathBuf>()
+                .to_string_lossy()
+                .to_string(),
+        );
+        correct.insert("c".to_string());
+        assert_eq!(
+            simplify_dir_names(vec![
+                "a/b",
+                "a/b//",
+                "a/././b///",
+                "c",
+                "c/",
+                "c/.",
+                "c/././",
+                "c/././."
+            ]),
+            correct
+        );
+    }
+    #[test]
+    fn test_simplify_dir_rm_subdir_and_not_substrings() {
+        let mut correct = HashSet::new();
+        correct.insert("b".to_string());
+        correct.insert(
+            ["c", "a", "b"]
+                .iter()
+                .collect::<std::path::PathBuf>()
+                .to_string_lossy()
+                .to_string(),
+        );
+        correct.insert(
+            ["a", "b"]
+                .iter()
+                .collect::<std::path::PathBuf>()
+                .to_string_lossy()
+                .to_string(),
+        );
+        assert_eq!(simplify_dir_names(vec!["a/b", "c/a/b/", "b"]), correct);
+    }
+
+    #[test]
+    fn test_simplify_dir_dots() {
+        let mut correct = HashSet::new();
+        correct.insert("src".to_string());
+        assert_eq!(simplify_dir_names(vec!["src/."]), correct);
+    }
+
+    #[test]
+    fn test_simplify_dir_substring_names() {
+        let mut correct = HashSet::new();
+        correct.insert("src".to_string());
+        correct.insert("src_v2".to_string());
+        assert_eq!(simplify_dir_names(vec!["src/", "src_v2"]), correct);
+    }
+
+    #[test]
+    fn test_is_a_parent_of() {
+        assert!(is_a_parent_of("/usr", "/usr/andy"));
+        assert!(is_a_parent_of("/usr", "/usr/andy/i/am/descendant"));
+        assert!(!is_a_parent_of("/usr", "/usr/."));
+        assert!(!is_a_parent_of("/usr", "/usr/"));
+        assert!(!is_a_parent_of("/usr", "/usr"));
+        assert!(!is_a_parent_of("/usr/", "/usr"));
+        assert!(!is_a_parent_of("/usr/andy", "/usr"));
+        assert!(!is_a_parent_of("/usr/andy", "/usr/sibling"));
+        assert!(!is_a_parent_of("/usr/folder", "/usr/folder_not_a_child"));
+    }
+
+    #[test]
+    fn test_is_a_parent_of_root() {
+        assert!(is_a_parent_of("/", "/usr/andy"));
+        assert!(is_a_parent_of("/", "/usr"));
+        assert!(!is_a_parent_of("/", "/"));
+    }
+}
--- a/src/utils/platform.rs
+++ b/src/utils/platform.rs
@@ -0,0 +1,65 @@
+use jwalk::DirEntry;
+#[allow(unused_imports)]
+use std::fs;
+use std::io;
+
+#[cfg(target_family = "unix")]
+fn get_block_size() -> u64 {
+    // All os specific implementations of MetatdataExt seem to define a block as 512 bytes
+    // https://doc.rust-lang.org/std/os/linux/fs/trait.MetadataExt.html#tymethod.st_blocks
+    512
+}
+
+#[cfg(target_family = "unix")]
+pub fn get_metadata(d: &DirEntry, use_apparent_size: bool) -> Option<(u64, Option<(u64, u64)>)> {
+    use std::os::unix::fs::MetadataExt;
+    d.metadata.as_ref().unwrap().as_ref().ok().map(|md| {
+        let inode = Some((md.ino(), md.dev()));
+        if use_apparent_size {
+            (md.len(), inode)
+        } else {
+            (md.blocks() * get_block_size(), inode)
+        }
+    })
+}
+
+#[cfg(target_family = "windows")]
+pub fn get_metadata(d: &DirEntry, _use_apparent_size: bool) -> Option<(u64, Option<(u64, u64)>)> {
+    use winapi_util::file::information;
+    use winapi_util::Handle;
+
+    let h = Handle::from_path_any(d.path()).ok()?;
+    let info = information(&h).ok()?;
+
+    Some((
+        info.file_size(),
+        Some((info.file_index(), info.volume_serial_number())),
+    ))
+}
+
+#[cfg(all(not(target_family = "windows"), not(target_family = "unix")))]
+pub fn get_metadata(d: &DirEntry, _apparent: bool) -> Option<(u64, Option<(u64, u64)>)> {
+    d.metadata
+        .as_ref()
+        .unwrap()
+        .as_ref()
+        .ok()
+        .map(|md| (md.len(), None))
+}
+
+#[cfg(target_family = "unix")]
+pub fn get_filesystem(file_path: &str) -> Result<u64, io::Error> {
+    use std::os::unix::fs::MetadataExt;
+    let metadata = fs::metadata(file_path)?;
+    Ok(metadata.dev())
+}
+
+#[cfg(target_family = "windows")]
+pub fn get_filesystem(file_path: &str) -> Result<u64, io::Error> {
+    use winapi_util::file::information;
+    use winapi_util::Handle;
+
+    let h = Handle::from_path_any(file_path)?;
+    let info = information(&h)?;
+    Ok(info.volume_serial_number())
+}