Helper functions I use for ZSH and WSL running on Windows 10

.bash_functions.sh

#!/usr/bin/env bash

#
# Helper functions that are intended to be sourced from ~/.zshrc inside WSL for
# Windows.In ~/.zshrc, execute with:
#
#     emulate bash -c "source ~/.bash_functions.sh"
#

# Allow GUI apps inside WSL to display inside the X Server running in Windows
DISPLAY=$(grep nameserver < /etc/resolv.conf | awk '{print $2}')
export DISPLAY="$DISPLAY:0"

# Adjust GUI scaling so things look nice on my Macbook Pro display
export GDK_SCALE=2
export QT_SCALE_FACTOR=1.25

# cd to the last saved directory
if [ -f ~/.last_dir ]; then
    cd $(cat ~/.last_dir)
fi

#
# Overrides the cd function to save the directory to ~/.last_dir. This allows
# the last directory to be restored when a new terminal session opens.
#
function cd_ {
    "cd" "$@"
    result=$?
    if [ $result -eq 0 ]; then
        pwd > ~/.last_dir
    fi

    return $result
}
alias cd=cd_

#
# Expands the given directory to the full Windows path.
#
# Arguments:
#   The path to expand.
#   The return variable to save the expanded path to.
#
function expand_to_windows_path {
    local __path=$1
    local __result_return=$2

    if [ -z "$__path" ]; then
        __path=$(pwd)
    else
        __path=$(/bin/readlink -f "$__path")
    fi

    __path="//wsl\$/$WSL_DISTRO_NAME$__path"

    if [[ "$__result_return" ]]; then
        __path=$(/bin/sed 's/\//\\\\/g' <<< "$__path")
        eval "$__result_return=$__path"
    else
        __path=$(/bin/sed 's/\//\\/g' <<< "$__path")
        echo "$__path"
    fi
}

#
# Expands the given directory to the full Network path in Windows. Assumes
# network is mounted to "Z:\"
#
# Arguments:
#   The path to expand.
#   The return variable to save the expanded path to.
#
function expand_to_network_path {
    local __path=$1
    local __result_return=$2

    if [ -z "$__path" ]; then
        __path=$(pwd)
    else
        __path=$(/bin/readlink -f "$__path")
    fi

    __path="Z:$__path"

    if [[ "$__result_return" ]]; then
        __path=$(/bin/sed 's/\//\\\\/g' <<< "$__path")
        eval "$__result_return=$__path"
    else
        __path=$(/bin/sed 's/\//\\/g' <<< "$__path")
        echo "$__path"
    fi
}

#
# Adds a "git discard" function that clears all uncommitted changes from the
# repository.
#
function git {
    if [ "$1" = "discard" ]; then
        git stash save --keep-index && git stash drop
    else
        command git "$@"
    fi
}

# Add a mirror function to upload a file to s3
#
# Uploads a file to our mirror S3 bucket.
#
# Arguments:
#   The path to the file to upload to the mirror.
#
function mirror {
    local path=$1

    if [ -z "$path" ]; then
        echo "You must provide a path to a file to upload" >&2
        return 1
    fi

    local name
    name=$(basename "$path")
    if s3 put -P "$1" "s3://$S3_MIRROR_BUCKET_NAME/$name"; then
        echo "https://$S3_MIRROR_URL/$name"
    fi
}

#
# Open WSL files inside Sublime Text running in Windows.
#
# Arguments:
#   (Optional) The path to open. Defaults to the current directory.
#
function subl {
    local path=$1

    if [ -z "$path" ]; then
        path="."
    fi

    expanded_path=
    expand_to_windows_path "$path" expanded_path
    "/mnt/c/Program Files/Sublime Text 3/subl.exe" "$expanded_path"
}

#
# Opens git-cola.
#
# Arguments:
#   (Optional) The directory to open. Defaults to the current directory.
#
function cola {
    local path=$1

    if [ -z "$path" ]; then
        path="."
    fi

    path=$(/bin/readlink -f "$path")

    _=$(/usr/bin/nohup /usr/bin/git-cola -r "$path" &>/dev/null &)

    # Maximize the window
    local id=""
    local name
    name=$(/usr/bin/basename "$path")
    while [ -z "$id" ]; do
        id=$(/usr/bin/xwininfo -root -children | /bin/grep git-cola | /bin/grep "$name" | /usr/bin/tail -1 | /usr/bin/awk '{print $1}')
        /bin/sleep 0.1
    done
    /usr/bin/wmctrl -ir "$id" -b add,maximized_vert,maximized_horz
}

#
# Opens a Visual Studio project in Windows.
#
# Arguments:
#   (Optional) The directory of the project to open. Defaults to the current
#   directory.
#
function vs {
    local path=$1

    if [ -z "$path" ]; then
        path="."
    fi

    path=${path%/}

    local files
    local match=""
    files=$(/bin/ls "$path")
    match=$(/bin/grep '\.sln$' <<< "$files" | /usr/bin/tail -1)
    if [ -z "$match" ]; then
        echo "Cannot find Visual Studio solution file in $path" >&2
        return 1
    fi

    path="$path/$match"

    expanded_path=
    expand_to_network_path "$path" expanded_path
    export PATH="$PATH"
    /mnt/c/WINDOWS/System32/WindowsPowerShell/v1.0/powershell.exe Start "$expanded_path"
}