subcommand: Simplify gsu().

[gsu.git] / subcommand

diff --git a/subcommand b/subcommand
index 05860f68395f67ffd3e9a51a60e48eb857a9cca8..6011ee68aad6b88103455167ea129008da1ec792 100644 (file)
--- a/subcommand
+++ b/subcommand
@@ -1,9 +1,11 @@
 #!/bin/bash
-# (C) 2006-2011 Andre Noll
+# Copyright (C) 2006 Andre Noll
+# Licensed under the LGPL, version 3. See COPYING and COPYING.LESSER.
 
-if [[ $(type -t gsu_is_a_number) != "function" ]]; then
-       GSU_DIR=${GSU_DIR:=${HOME-}/.gsu}
-       . $GSU_DIR/common || exit 1
+if [[ "$(type -t _gsu_setup)" != "function" ]]; then
+       gsu_dir=${gsu_dir:-${BASH_SOURCE[0]%/*}}
+       . $gsu_dir/common || exit 1
+       _gsu_setup
 fi
 
 _gsu_usage()
@@ -23,7 +25,7 @@ _gsu_usage()
 # exactly one parenthesized subexpression for matching the command name.
 _gsu_get_command_regex()
 {
-       local cmd="${1:-[-a-zA-Z_0-9]+}"
+       local cmd="${1:-[-a-zA-Z_0-9]{1,\}}"
        result="^com_($cmd)\(\)"
 }
 
@@ -49,25 +51,26 @@ _gsu_available_commands()
 }
 
 _gsu_print_available_commands()
-{(
-       local i count=0
-       gsu_short_msg "Available commands:"
-       for i in $gsu_cmds; do
-               printf "$i"
-               count=$(($count + 1))
-               if test $(($count % 4)) -eq 0; then
-                       echo
+{
+       local cmd
+       local -i count=0
+
+       printf 'Available commands:\n'
+       for cmd in $gsu_cmds; do
+               printf '%s' "$cmd"
+               let ++count
+               if (($count % 4)); then
+                       printf '\t'
+                       ((${#cmd} < 8)) && printf '\t'
                else
-                       printf "\t"
-                       if test ${#i} -lt 8; then
-                               printf "\t"
-                       fi
+                       printf '\n'
                fi
        done
-       echo
-) 2>&1
+       printf '\n'
 }
 
+# Print all options of the given optstring to stdout if the word in the current
+# command line begins with a hyphen character.
 gsu_complete_options()
 {
        local opts="$1" cword="$2" cur opt
@@ -93,10 +96,12 @@ Print the current preferences.
 
 Usage: prefs [-e]
 
-If -e is given, the config file is opened with the default editor.  Without
-options, the command prints out a list of all cmt config variables, together
-with their current value and the default value."
-_com_prefs()
+If -e is given, the config file is opened with the default editor.
+Without options, the command prints out a list of all config variables,
+together with their current value and the default value.
+"
+
+com_prefs()
 {
        local i conf="${gsu_config_file:=${HOME:-}/.$gsu_name.rc}"
 
@@ -154,19 +159,20 @@ Print the manual.
 
 Usage: man"
 
-_com_man()
+
+com_man()
 {
        local equal_signs="=================================================="
        local minus_signs="--------------------------------------------------"
-        local com num
+       local com num
 
        echo "$gsu_name (_${gsu_banner_txt}_) manual"
        echo "${equal_signs:0:${#gsu_name} + ${#gsu_banner_txt} + 16}"
        echo
 
-        sed -e '1,/^#\{70,\}/d' -e '/^#\{70,\}/,$d' $0 -e 's/^# *//'
+       sed -e '1,/^#\{70,\}/d' -e '/^#\{70,\}/,$d' $0 -e 's/^# *//'
        echo "----"
-        echo
+       echo
        echo "$gsu_name usage"
        echo "${minus_signs:0:${#gsu_name} + 6}"
        printf "\t"
@@ -178,16 +184,16 @@ _com_man()
        echo "Available commands:"
 
        _gsu_available_commands
-        for com in $result; do
+       for com in $result; do
                num=${#com}
                (($num < 4)) && num=4
-                echo "${minus_signs:0:$num}"
-                echo "$com"
-                echo "${minus_signs:0:$num}"
-                $0 help $com
+               echo "${minus_signs:0:$num}"
+               echo "$com"
+               echo "${minus_signs:0:$num}"
+               $0 help $com
                echo
-        done
-        ret=$GSU_SUCCESS
+       done
+       ret=$GSU_SUCCESS
 }
 
 export gsu_help_txt="
@@ -212,7 +218,7 @@ written to stdout. This can be used from the completion function of
 the subcommand.
 "
 
-_com_help()
+com_help()
 {
        local a b ere tab='     '
 
@@ -314,7 +320,7 @@ complete_help()
 # Aborts on programming errors such as missing or invalid option string.  On
 # success $result contains shell code that can be eval'ed. For each defined
 # option x, the local variable o_x will be created when calling eval "$result".
-# o_x contains true/false for options without argument and either the emtpy
+# o_x contains true/false for options without argument and either the empty
 # string or the given argument for options that take an argument.
 #
 # Example:
@@ -394,7 +400,7 @@ gsu_getopts()
        ret=$GSU_SUCCESS
 }
 
-_com_complete()
+com_complete()
 {
        local cmd n cword
        local -a words
@@ -524,7 +530,6 @@ gsu_get_unnamed_arg_num()
 gsu()
 {
        local i
-       _gsu_setup
        _gsu_available_commands
        gsu_cmds="$result"
        if (($# == 0)); then
@@ -534,28 +539,14 @@ gsu()
        fi
        arg="$1"
        shift
-       # check internal commands
-       if [[ "$arg" = "help" || "$arg" = "man" || "$arg" = "prefs" || "$arg" = "complete" ]]; then
-               _com_$arg "$@"
+       if [[ "$(type -t com_$arg)" == 'function' ]]; then
+               com_$arg "$@"
                if (("$ret" < 0)); then
                        gsu_err_msg
                        exit 1
                fi
                exit 0
        fi
-
-       # external commands
-       for i in $gsu_cmds; do
-               if test "$arg" = "$i"; then
-                       com_$arg "$@"
-                       if (("$ret" < 0)); then
-                               gsu_err_msg
-                               exit 1
-                       fi
-                       exit 0
-               fi
-       done
-
        ret=-$E_GSU_BAD_COMMAND
        result="$arg"
        gsu_err_msg
@@ -574,8 +565,7 @@ gsu()
 #      0 0 no argument allowed
 #      1 1 exactly one argument required
 #      0 2 at most two arguments admissible
-#      2   at least two arguments reqired
-#
+#      2   at least two arguments required
 gsu_check_arg_count()
 {
        ret=-$E_GSU_BAD_ARG_COUNT