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