basic dotfile manager

dotfiles

#!/usr/bin/env bash

set -euo pipefail

which git sed cut 1>/dev/null 

timestamp="$(date +'%Y-%m-%d %H:%M')"

c_base=$'\033[0m'

c_red=$'\033[00;31m'
c_green=$'\033[00;32m'
c_yellow=$'\033[00;33m'
c_blue=$'\033[00;34m'
c_purple=$'\033[00;35m'
c_cyan=$'\033[00;36m'
c_lightgray=$'\033[00;37m'

c_lred=$'\033[01;31m'
c_lgreen=$'\033[01;32m'
c_lyellow=$'\033[01;33m'
c_lblue=$'\033[01;34m'
c_lpurple=$'\033[01;35m'
c_lcyan=$'\033[01;36m'
c_white=$'\033[01;37m'

function dotgit()
{
    git -c core.excludesFile=$HOME/.shared-config/.gitignore --git-dir=$HOME/.shared-config/.git --work-tree=$HOME "$@"
}

function errlog()
{
    echo "$@" >&2
}

function panic()
{
    errlog "$@"
    exit 255
}

function dotfiles-status()
{
    dotgit status "$@" --porcelain --null | (
        while IFS= read -r -d $'\0' line; do
            if [[ "$line" = \?\?* ]]; then 
                continue
            fi 
            status="$(echo $(echo "$line" | cut -b 1-3))"
            file="$(echo "$line" | cut -b 4-)"
            if [ "$status" != "??" ]; then
                case "$status" in
                    M) # modified
                        echo "  ${c_lgreen}~/${file}${c_base}"
                        ;;
                    D) # deleted
                        echo "  ${c_red}~/${file}${c_base} (deleted)"
                        ;;
                    A) # added
                        ;&
                    AM) # added+modified
                        ;&
                    *)
                        echo "  ${c_lpurple}~/${file}${c_base} (unknown status: '${status}')"
                        ;;
                esac
            fi
        done
    )
}

function dotfiles-diff()
{
    dotgit diff HEAD "$@"
}

function dotfiles-sync()
{
    dotgit status "$@" --porcelain --null | {
        declare -a files=()
        fault=0
        while IFS= read -r -d $'\0' line; do
            if [[ "$line" = \?\?* ]]; then 
                continue
            fi 
            status="$(echo $(echo "$line" | cut -b 1-3))"
            file="$(echo "$line" | cut -b 4-)"
            if [ "$status" != "??" ]; then
                case "$status" in
                    M) # modified
                        files+=("$HOME/${file}")
                        ;;
                    D) # deleted
                        echo "  ${c_red}~/${file}${c_base} (deleted)"
                        fault=1
                        ;;
                    *)
                        echo "  ${c_lpurple}~/${file}${c_base} (unknown status: '${status}')"
                        fault=1
                        ;;
                esac
            fi
        done
        if [ $fault -ne 0 ]; then 
            errlog "Repository unclean, please fix state first before syncing!" 
            return 1
        fi

        dotgit add -f "${files[@]}"
        dotgit commit -m "[${timestamp}] Synchronizes ${files[@]}" || {
            dotgit reset "${files[@]}"
            errlog "failed create commit!"
            return 1
        }
        dotgit push 
        dotgit pull --rebase=false
    }
}

function dotfiles-add()
{
    if [ "$#" -lt 1 ]; then 
        panic "add requires files to be added!"
    fi

    declare -a list=()
    for file in "$@"; do
        rfile="$(realpath "${file}")"
        dotgit add -f "${rfile}"
        list+=("$(echo "${rfile}" | sed 's|^'"$HOME"'|~|')")
        unset rfile
    done

    msg="[${timestamp}] Adds/updates ${list[@]}"
    dotgit commit -m "msg"
    dotgit push 
}

function dotfiles-remove()
{
    if [ "$#" -lt 1 ]; then 
        panic "remove requires files to be added!"
    fi

    declare -a list=()
    fault=0
    for file in "$@"; do
        rfile="$(realpath "${file}")"
        if dotgit rm -rf "${rfile}"; then
            list+=("$(echo "${rfile}" | sed 's|^'"$HOME"'|~|')")
        else
            errlog "failed to remove ${file}"
            fault=1
        fi
    done

    if [ $fault -eq 0 ]; then
        dotgit commit -m "[${timestamp}] Deletes ${list[@]}"
        dotgit push 
    else 
        errlog "won't delete files with failures!"
    fi
}

if [ "$#" -lt 1 ]; then 
    errlog "usage: dotfiles <command>"
    errlog ""
    errlog "  commands:"
    errlog "    status           - prints which local files have changes."
    errlog "    diff             - lists all active changes."
    errlog "    sync             - commits changes and pulls changes from the remote."
    errlog "    add <files…>     - adds the given files and pushes them to the remote."
    errlog "    remove <files>…  - removes the given files and drops them from the remote."
    errlog "    git <…>          - direct access to git."
    errlog ""
    exit 1
fi

command="$1"
shift

case "${command}" in
    status)
        dotfiles-status "$@"
        ;;
    sync)
        dotfiles-sync "$@"
        ;;
    add)
        dotfiles-add "$@"
        ;;
    remove)
        dotfiles-remove "$@"
        ;;
    diff)
        dotfiles-diff "$@"
        ;;
    git)
        dotgit "$@"
        ;;
    *)
        panic "invalid command ${command}"
        ;;
esac