config

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#!/bin/bash
#                   __ _       
#   ___ ___  _ __  / _(_) __ _ 
#  / __/ _ \| '_ \| |_| |/ _` |
# | (_| (_) | | | |  _| | (_| |
#  \___\___/|_| |_|_| |_|\__, |
#                        |___/ 
#
# A simple configuration manager
# 2021 (C) Pablo
# Free use of this software is granted under the terms of the GPL-3.0 License

print_files() 
{
  IFS='' read -r file

  if [ -n "$file" ]
  then
    printf '\033[0;%sm%s files:\033[0m\n' "$2" "$1"
    while true
    do
      printf '\033[0;%sm%s\033[0m\n' "$2" "$file"
      IFS='' read -r file
      [ -z "$file" ] && break
    done
  fi
}

# Get the path to the git repository that should be used for storing stuff
if [ -n "$DOTFILES_REPO" ]
then
  dotfiles_repo="$DOTFILES_REPO"
elif [ -n "$XDG_DATA_HOME" ]
then
  dotfiles_repo="$XDG_DATA_HOME/dotfiles"
else
  dotfiles_repo="$HOME/.local/share/dotfiles"
fi

# Get the name of the files that holds the list of all dotfiles that should be
# tracked
if [ -n "$DOTFILES_LIST" ]
then
  dotfiles_list="$DOTFILES_LIST"
elif [ -n "$XDG_CONFIG_HOME" ]
then
  dotfiles_list="$XDG_CONFIG_HOME/dotfiles.list"
else
  dotfiles_list="$HOME/.config/dotfiles.list"
fi

# Calls git in the appropriate repository
call_git() 
{
  git --git-dir="$dotfiles_repo" --work-tree="$HOME" "$@"
}

# Given a path, print the files and directories matching this path that are
# included in the list of dotfiles
get_pathspec()
{
  path="$1"

  if [ -f "$path" ]
  then
    tmp_path="$(realpath "$path")"

    # Check if the file is contained in any of the directories listed in the
    # dotfiles list are the parents of path. If this is the case, print path
    while [ "$tmp_path" != '/' ]
    do
      if grep -Fx "$tmp_path" "$dotfiles_list" > /dev/null
      then
        echo "$path"
        return
      fi

      tmp_path="$(dirname "$tmp_path")"
    done
  elif [ -d "$path" ]
  then
    # Print all of the files and directories from the list of dotfiles
    # contained in path

    # TODO: The regex should only math occurances of path starting at the
    # beggining of the line
    grep -F "$(realpath "$path")" "$dotfiles_list"
  fi

  # TODO: Print a warning if we get to here: No such file or directory
}

# Parse the commands
case "$1" in
  # Add files to the list of tracked files
  track)
    shift

    case "$1" in
      # Remove files from the list of dotfiles
      -d|--delete)
        shift

        # Remove files from the list of dotfiles
        for item in "$@"
        do
          # TODO: Properly escape pattern
          echo "Removing '$item' from the list of dotfile"
          pattern="$(realpath "$item")"
          pattern="${pattern//\//\\\/}"

          # Remove the files from the git repository and from the list of files
          # Awk is used because 'item' may be a directory
          awk -i inplace "!/^$pattern/ { print }" "$dotfiles_list"
          call_git rm "$item" --cached -r
        done
        ;;
      *)
        # Add files to the list of dotfiles
        for item in "$@"
        do
          echo "Adding '$item' to the list of dotfiles"
          realpath "$item" >> "$dotfiles_list"
        done
        ;;
    esac
    ;;

  # Add the files
  add)
    shift
    for item in "$@"
    do
      get_pathspec "$item" | call_git add --pathspec-from-file -
    done
    ;;

  # List the dotfiles specified in configurations list
  list)
    cat "$dotfiles_list"
    ;;

  # Show the configuration files that have been modified or deleted
  status)
    call_git status --porcelain \
      | awk '/^A / { print "✔️  ~/"$2 }; /^ A/ { print "   ~/"$2 }' \
      | print_files 'new' '30'

    call_git status --porcelain \
      | awk '/^M / { print "✔️  ~/"$2 }; /^ M/ { print "   ~/"$2 }' \
      | print_files 'modified' '33'

    call_git status --porcelain \
      | awk '/^D / { print "✔️  ~/"$2 }; /^ D/ { print "   ~/"$2 }' \
      | print_files 'deleted' '31'
    ;;

  # Just pass the following arguments to git
  --)
    shift
    call_git "$@"
    ;;

  # Just pass the arguments to git
  *)
    call_git "$@"
    ;;
esac