config

   1 #!/bin/bash
   2 # Copyright (C) 2006 Andre Noll
   3 # Licensed under the LGPL, version 3. See COPYING and COPYING.LESSER.
   4
   5 # Syntactically check the gsu_options array for errors and parse the config
   6 # file.
   7 gsu_check_options()
   8 {
   9         local i conf="${gsu_config_file:=${HOME:-}/.$gsu_name.rc}" val orig_val
  10         local name option_type default_value required description help_text
  11
  12         for ((i=0; i < ${#gsu_options[@]}; i++)); do
  13                 eval "${gsu_options[$i]}"
  14                 eval val='"'\${${name}:-}'"'
  15                 eval orig_${gsu_config_var_prefix}_$name='"'${val}'"'
  16         done
  17
  18         [[ -r "$conf" ]] && source "$conf"
  19
  20         for ((i=0; i < ${#gsu_options[@]}; i++)); do
  21                 name=
  22                 option_type=
  23                 default_value=
  24                 required=
  25                 description=
  26                 help_text=
  27
  28                 eval "${gsu_options[$i]}"
  29
  30                 # Check name. It must be non-empty and consist of [a-zA-Z_0-9]
  31                 # only.  Moreover it must start with [a-zA-Z].
  32                 ret=-$E_GSU_BAD_CONFIG_VAR
  33                 result="name: '$name'"
  34                 # bash's =~ works only for 3.2 and newer, so use grep
  35                 echo "$name" | grep '^[a-zA-Z][a-zA-Z_0123456789]*$' &> /dev/null;
  36                 (($? != 0)) && return
  37
  38                 eval orig_val='"'\$orig_${gsu_config_var_prefix}_$name'"'
  39                 if [[ -z "$orig_val" ]]; then
  40                         eval val='"'\${$name:-}'"'
  41                 else
  42                         val="$orig_val"
  43                 fi
  44                 case "$required" in
  45                 true|yes)
  46                         ret=-$E_GSU_NEED_VALUE
  47                         result="$name"
  48                         [[ -z "$val" ]] && return
  49                         ;;
  50                 false|no)
  51                         ;;
  52                 *)
  53                         ret=-$E_GSU_BAD_BOOL
  54                         result="required: $required, name: $name, val: $val"
  55                         return
  56                 esac
  57
  58                 eval ${gsu_config_var_prefix}_$name='"'\${val:="$default_value"}'"'
  59                 # Check option type. ATM, only num and string are supported
  60                 # Other types may be added without breaking compatibility
  61                 case "$option_type" in
  62                 string)
  63                         ;;
  64                 num)
  65                         gsu_is_a_number "$val"
  66                         (($ret < 0)) && return
  67                         ;;
  68                 *)
  69                         ret=-$E_GSU_BAD_OPTION_TYPE
  70                         result="$name/$option_type"
  71                         return
  72                 esac
  73         done
  74         ret=$GSU_SUCCESS
  75 }
  76
  77 # Call gsu_check_options(), die on errors.
  78 gsu_check_options_or_die()
  79 {
  80         gsu_check_options
  81         if (($ret < 0)); then
  82                 gsu_err_msg
  83                 exit 1
  84         fi
  85 }
  86
  87 if [[ "$(type -t _gsu_setup)" != "function" ]]; then
  88         gsu_dir=${gsu_dir:-${BASH_SOURCE[0]%/*}}
  89         . $gsu_dir/common || exit 1
  90         _gsu_setup
  91 fi