#!/bin/bash

# yadm exposes all parameters of the command which triggers a hook. Those
# parameters are exported as the environment variable YADM_HOOK_FULL_COMMAND.
# Any spaces, tabs, or backslashes in those parameters are escaped with a
# backslash. The function `parse_full_command()` is a demonstration of parsing
# those values which may be escaped.

function parse_full_command() {
  local delim=$'\x1e' # ASCII Record Separator
  local space=$'\x1f' # ASCII Unit Separator
  local tab=$'\t'     # ASCII TAB
  local cmd
  cmd="$YADM_HOOK_FULL_COMMAND"
  cmd="${cmd//\\ /$space}"      # swap escaped spaces for `1f`
  cmd="${cmd//\\\\/\\}"         # fix escaped backslashes
  cmd="${cmd//\\$tab/$tab}"     # fix escaped tabs
  cmd="${cmd// /$delim}"        # convert space delimiters to `1c`
  cmd="${cmd//$space/ }"        # convert `1f` back to spaces
  # parse data into an array
  IFS=$delim read -r -a full_cmd <<< "$cmd"
}
parse_full_command
for param in "${full_cmd[@]}"; do
  echo "Parameter: '$param'"
done