bash_utils

#!/usr/bin/env bash

# if [[ -s "${HOME}/.bash_utils" ]]; then
#   source "${HOME}/.bash_utils"
# elif [[ -s "${HOME}/dotfiles/.bash_utils" ]]; then
#   source "${HOME}/dotfiles/.bash_utils"
# else
#   printf '\e[31m~/cannot source bash_utils \e[0m\n' >&2
# fi

declare -A colors
colors[reset]=$(tput sgr0)
colors[black]=$(tput setaf 0)
colors[red]=$(tput setaf 1)
colors[green]=$(tput setaf 2)
colors[yellow]=$(tput setaf 3)
colors[blue]=$(tput setaf 4)
colors[magenta]=$(tput setaf 5)
colors[cyan]=$(tput setaf 6)
colors[grey]=$(tput setaf 7)
colors[lblack]=$(tput setaf 8)
colors[lred]=$(tput setaf 9)
colors[lgreen]=$(tput setaf 10)
colors[lyellow]=$(tput setaf 11)
colors[lblue]=$(tput setaf 12)
colors[lmagenta]=$(tput setaf 13)
colors[lcyan]=$(tput setaf 14)
colors[lgrey]=$(tput setaf 15)

color() {
  local c
  c="$1"
  shift
  printf '%s' "${colors[$c]}"
  printf '%s\n' "$@"
  printf '%s' "${colors[reset]}"
}

in_term() {
  [[ -t 0 || -p /dev/stdin ]]
}

is_running() {
  pgrep "$1" &> /dev/null
}

info() {
  color green "$@" >&2
}

color() {
  local c
  c="$1"
  shift
  printf '%s' "${colors[$c]}"
  printf '%s\n' "$@"
  printf '%s' "${colors[reset]}"
}

err() {
  color red "$@" >&2
}

die() {
  [[ -n "$1" ]] && err "$1"
  exit 1
}


has() {
  local o c loud
  loud=0
  while getopts 'v' o; do
    case "$o" in
      v) loud=1 ;;
    esac
  done
  shift "$((OPTIND-1))"
  for c; do c="${c%% *}"
    if ! command -v "$c" &> /dev/null; then
      (( loud )) && err "$c not found"
      return 1
    fi
  done
}

select_from() {
  local a c cmd
  cmd='command -v'
  for a in "$@"; do
    case "$a" in
      -c) cmd="$2"; shift 2 ;;
    esac
  done
  for c in "$@"; do
    if $cmd "${c%% *}" &> /dev/null; then
      echo "$c"
      return 0
    fi
  done
  return 1
}


ask() {
  read -r -n1 -p "$* " ans
  printf '\n'
  [[ ${ans^} = Y* ]]
}

prompt() {
  local opts=() one
  for a; do
    case "$a" in
      -1) opts+=( '-n1' ); one=1; shift ;;
      -s) opts+=( '-s' ); shift ;;
    esac
  done
  read -e -r "${opts[@]}" -p "$* " ans
  if [[ $one = 1 ]]; then
    printf '\n'
    if [[ ${ans,} = y ]]; then
      return 0
    else
      return 1
    fi
  fi
  printf '%s\n' "$ans"
}

parse_config_file() {
  local line key val nr space line
  nr=0
  config_err=()
  while IFS= read -r line; do
    (( ++nr ))
    [[ -z "$line" || "$line" = '#'* ]] && continue
    space=${line%%[![:space:]]*}
    line=${line#"$space"}
    key=${line%% *}
    line=${line#"$key"}
    space=${line%%[![:space:]]*}
    val=${line#"$space"}
    [[ $key = '"'*'"' ]] && key=${key/#\"} key=${key/%\"}
    [[ $key = *: ]] && key="${key%:/}"
    [[ $val = '= '* ]] && val="${val#* }"
    if [[ -z "$val" ]]; then
      config_err+=( "  missing value for \"$key\" in config file on line $nr" )
      continue
    fi
    case "$key" in
      *) config_error+=("unknown config entry $key on line $nr") ;;
    esac
  done
  if (( ${#config_err[@]} > 0 )); then
    err 'there were errors parsing config file:' "${config_err[@]}"
  fi
}