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: '$name'"
  34                 [[ "$name" =~ ^[a-zA-Z][a-zA-Z_0123456789]*$ ]] || return
  35
  36                 eval orig_val='"'\$orig_${gsu_config_var_prefix}_$name'"'
  37                 if [[ -z "$orig_val" ]]; then
  38                         eval val='"'\${$name:-}'"'
  39                 else
  40                         val="$orig_val"
  41                 fi
  42                 case "$required" in
  43                 true|yes)
  44                         ret=-$E_GSU_NEED_VALUE
  45                         result="$name"
  46                         [[ -z "$val" ]] && return
  47                         ;;
  48                 false|no)
  49                         ;;
  50                 *)
  51                         ret=-$E_GSU_BAD_BOOL
  52                         result="required: $required, name: $name, val: $val"
  53                         return
  54                 esac
  55
  56                 eval ${gsu_config_var_prefix}_$name='"'\${val:="$default_value"}'"'
  57                 # Check option type. ATM, only num and string are supported
  58                 # Other types may be added without breaking compatibility
  59                 case "$option_type" in
  60                 string)
  61                         ;;
  62                 num)
  63                         gsu_is_a_number "$val"
  64                         ((ret < 0)) && return
  65                         ;;
  66                 *)
  67                         ret=-$E_GSU_BAD_OPTION_TYPE
  68                         result="$name/$option_type"
  69                         return
  70                 esac
  71         done
  72         ret=$GSU_SUCCESS
  73 }
  74
  75 # Call gsu_check_options(), die on errors.
  76 gsu_check_options_or_die()
  77 {
  78         gsu_check_options
  79         if ((ret < 0)); then
  80                 gsu_err_msg
  81                 exit 1
  82         fi
  83 }
  84
  85 if [[ "$(type -t _gsu_setup)" != "function" ]]; then
  86         gsu_dir=${gsu_dir:-${BASH_SOURCE[0]%/*}}
  87         . "$gsu_dir/common" || exit 1
  88         _gsu_setup
  89 fi