config

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