#!/usr/bin/env bash

# FORMATTER SCRIPT
#
# Formats Elixir files via `mix format`. This should be considered the canonical
# formatter for the project.
#
# VS Code users in particular should be careful with its Elixir formatter (since 
# it routinely ignores the formatting settings) and should consider using this 
# script instead via the `emeraldwalk.runonsave` extension with the following
# configuration:
#
# ```
#   "emeraldwalk.runonsave": {
#     "commands": [
#       {
#         "match": "\\.ex$|\\.exs$|\\.js$|\\.ts$",
#         "cmd": "bin/dev/format ${file}"
#       }
#     ]
#   }
# ```
#
# Options: 
#   <file> or <path>: formats the file or all files in the path
#   --all: formats all files in the current directory
#   --cd: formats all files in the given directory
#   --check: fails if some files are not formatted


set -e

file=$1

assert_file() {
  if [ ! -f "$1" ]; then
    echo "error: file '${1}' does not exist"
    exit 1
  fi
}

case $1 in
  --all)
    mix format
    ;;

  --cd)
    cd $2
    shift
    shift
    ;;

  --check)
    mix format --check-formatted
    ;;

  *.ex | *.exs)
    assert_file $1
    mix format "$1"
    ;;

  *)
    echo "unknown flag or file type: '$1'"
    echo ""
    echo "USAGE"
    echo "  $0 <file> or <path>"
    echo "  $0 --all"
    echo "  $0 --cd <path>"
    echo "  $0 --check"
    exit 1
    ;;
esac