mysociety/alaveteli

#!/bin/bash
set -e

function usage {
  cat <<EOF
Usage: $( basename $0 ) THEME_FILE

Currently only works with overrides in the lib directory in your alaveteli theme

ARGUMENTS
  THEME_FILE: path to a file in your alaveteli theme

OPTIONS
  -d diff tool including arguments (default: /usr/bin/git diff)
  -h display this help message

EXAMPLES

  script/diff-theme-override \\
  $(script/current-theme -v)/lib/views/help/about.html.erb

  Diff a single overridden file with the alaveteli-core version.

  find \$(script/current-theme -v) -type f -name "*.erb" -exec \\
  script/diff-theme-override -d "/usr/bin/git diff --name-only" \\
  {} \; 2>/dev/null

  Just get the names of overridden view templates.

  find \$(script/current-theme -v) -type f -name "*.erb" -exec \\
  script/diff-theme-override -d "/usr/bin/git diff --numstat" {} \;

  Get a picture of the number of changes between overridden view templates

  find \$(script/current-theme -v) -type f -name "*.erb" -exec \\
    script/diff-theme-override -d "vim -d" {} \; 2>/dev/null

  Open each template in vim's diff mode, which compares the current version of
  the alaveteli-core template with the override in your theme. You can
  reconcile the changes in vim. Exiting vim will open the next file until you've
  covered all overriden templates.

EOF
}

function alaveteli_dir {
  echo "$(dirname "{BASH_SOURCE[0]}")"
}

function main {
  relative_path=`echo "$THEME_FILE" | sed "s|.*\/lib\/||"`
  $DIFF_TOOL "$(alaveteli_dir)/app/$relative_path" $THEME_FILE
}

DIFF_TOOL="/usr/bin/git diff"

while getopts "hd:" opt; do
  case $opt in
    h)
      usage
      exit 0
      ;;
    d)
      DIFF_TOOL="$OPTARG"
      ;;
    \:)
      echo "Option -$OPTARG requires an argument" >&2
      echo ""
      exit 1
      ;;
    \?)
      echo "Invalid option -$OPTARG" >&2
      echo ""
      usage
      exit 1
      ;;
  esac
done

shift $(($OPTIND - 1))
THEME_FILE="$*"

if ! [[ -f $THEME_FILE ]]
  then
    echo "$THEME_FILE: No such file or directory"
    usage
    exit 1
fi

main