#!/bin/bash
# gsu -- the global subcommand utility
-# (C) 2006-2009 Andre Noll
+# (C) 2006-2010 Andre Noll
_gsu_init_errors()
{
GSU_SUCCESS success
E_GSU_BAD_COMMAND invalid command
E_GSU_NOT_A_NUMBER not a number
-E_GSU_SOURCE error in config file
-E_GSU_CONFIG bad/missing config file option
E_GSU_BAD_CONFIG_VAR invalid config variable
E_GSU_NEED_VALUE value required but not given
E_GSU_BAD_BOOL bad value for boolian option
E_GSU_BAD_OPTION_TYPE invalid option type
-E_NO_DEFAULT missing default value
+E_GSU_BAD_ARG_COUNT invalid number of arguments
+E_GSU_EDITOR failed to execute editor
+E_GSU_MKDIR failed to create directory
+E_GSU_GETOPTS getopts error
$gsu_errors
"
local a b i=0
}
export -f gsu_is_a_number
+# Check number of arguments.
+#
+# Usage: gsu_check_arg_count <num_given> <num1> [<num2>]
+#
+# Check that <num_given> is between <num1> and <num2> inclusively.
+# If only <num1> ist given, num2 is assumed to be infinity.
+#
+# Examples:
+# 0 0 no argument allowed
+# 1 1 exactly one argument required
+# 0 2 at most two arguments admissible
+# 2 at least two arguments reqired
+#
+gsu_check_arg_count()
+{
+ ret=-$E_GSU_BAD_ARG_COUNT
+ if [[ $# -eq 2 ]]; then # only num1 is given
+ result="at least $2 args required, $1 given"
+ [[ $1 -lt $2 ]] && return
+ ret=$GSU_SUCCESS
+ return
+ fi
+ # num1 and num2 given
+ result="need at least $2 args, $1 given"
+ [[ $1 -lt $2 ]] && return
+ result="need at most $3 args, $1 given"
+ [[ $1 -gt $3 ]] && return
+ ret=$GSU_SUCCESS
+}
+export -f gsu_check_arg_count
+
gsu_short_msg()
{
echo "$1" 1>&2
}
export -f gsu_date_msg
+
+
_gsu_banner_msg()
{
- local txt="*** $_gsu_self --"
+ local txt="### $_gsu_self --"
if test -z "$gsu_banner_txt"; then
txt="$txt set \$gsu_banner_txt to customize this message"
else
txt="$txt $gsu_banner_txt"
fi
- gsu_short_msg "$txt ***"
+ gsu_short_msg "$txt ###"
}
export -f _gsu_banner_msg
_gsu_usage()
{
- gsu_short_msg "Usage: $_gsu_self command [options]"
+ gsu_short_msg "# Usage: $_gsu_self command [options]"
}
export -f _gsu_usage
export gsu_prefs_txt="
Print the current preferences.
-Usage: prefs
+Usage: prefs [-e]
-Print out a list of all cmt config variables, together with their current value
-and the default value."
-com_prefs()
+If -e is given, the config file is opened with the default editor. Without
+options, the command prints out a list of all cmt config variables, together
+with their current value and the default value."
+_com_prefs()
{
- local i
+ local i conf="${gsu_config_file:=$HOME/.$gsu_name.rc}"
+
+ if [[ "$1" = "-e" ]]; then
+ ret=-$E_GSU_MKDIR
+ result="${conf%/*}"
+ mkdir -p "$result"
+ [[ $? -ne 0 ]] && return
+ ret=-$E_GSU_EDITOR
+ result="${EDITOR:-vi}"
+ "$result" "$conf"
+ [[ $? -ne 0 ]] && return
+ ret=$GSU_SUCCESS
+ return
+ fi
for ((i=0; i < ${#gsu_options[@]}; i++)); do
local name= option_type= default_value= required=
echo
done
}
-export -f com_prefs
+export -f _com_prefs
export gsu_man_txt="
Print the manual.
Usage: man"
-com_man()
+_com_man()
{
local equal_signs="=================================================="
local minus_signs="--------------------------------------------------"
done
ret=$GSU_SUCCESS
}
-export -f com_man
+export -f _com_man
export gsu_help_txt="
Print online help.
Without arguments, print the list of available commands. Otherwise,
print the help text for the given command."
-com_help()
+_com_help()
{
local a b
if test -z "$1"; then
_gsu_banner_msg 2>&1
_gsu_usage 2>&1
- # sed is magic, baby
- (printf "com_help()\n$gsu_help_txt" | head -n 4; echo "--"
- printf "com_man()\n$gsu_man_txt" | head -n 4; echo "--"
- printf "com_prefs()\n$gsu_prefs_txt" | head -n 4; echo "--"
-
- grep -A 2 "^com_\([a-zA-Z_0-9]\+\)()" $0) \
- | grep -v -- '--' \
+ {
+ printf "com_help()\n$gsu_help_txt" | head -n 4; echo "--"
+ printf "com_man()\n$gsu_man_txt" | head -n 4; echo "--"
+ printf "com_prefs()\n$gsu_prefs_txt" | head -n 4; echo "--"
+ grep -A 2 "^com_\([a-zA-Z_0-9]\+\)()" $0
+ } | grep -v -- '--' \
| sed -e '/^com_\([a-zA-Z_0-9]\+\)()/bs' \
-e 'H;$!d;x;s/\n//g;b' \
-e :s \
echo "$b"
done
echo
- echo "Try $_gsu_self help <command> for info on <command>."
+ echo "# Try $_gsu_self help <command> for info on <command>."
ret=$GSU_SUCCESS
return
fi
fi
ret=$GSU_SUCCESS
if grep -q "^com_$1()" $0; then
- sed -e "1,/com_$1()/d" -e '/^{/,$d' -e 's/^## *//' $0
+ sed -e "1,/^com_$1()$/d" -e '/^{/,$d' -e 's/^## *//' $0
return
fi
_gsu_print_available_commands
result="$1"
ret=-$E_GSU_BAD_COMMAND
}
-export -f com_help
+export -f _com_help
# internal gsu function that syntactically checks the gsu_options array
# for errors and parses the config file.
# only. Moreover it must not start with [a-zA-Z].
ret=-$E_GSU_BAD_CONFIG_VAR
- result="$name"
+ result="name: '$name'"
# bash's =~ works only for 3.2 and newer, so use grep
echo "$name" | grep '^[a-zA-Z][a-zA-Z_0123456789]*$' &> /dev/null;
[[ $? -ne 0 ]] && return
return
esac
- eval ${gsu_config_var_prefix}_$name="\"${val:=$default_value}\""
+ eval ${gsu_config_var_prefix}_$name='"'${val:=$default_value}'"'
# Check option type. ATM, only num and string are supported
# Other types may be added without breaking compatibility
case "$option_type" in
}
export -f _gsu_check_options
+# Wrapper for bash's getopts.
+#
+# 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 an argument or the emtpy string/the
+# given argument, depending on whether this option was contained in the "$@"
+# array.
+#
+# Example:
+# gsu_getopts abc:x:y
+# eval "$result"
+# [[ $ret -lt 0 ]] && return
+#
+# [[ "$o_a" = "true ]] && echo "The -a flag was given"
+# [[ -n "$o_c" ]] && echo "The -c option was given with arg $o_c"
+gsu_getopts()
+{
+ local i c tab=' ' cr='
+'
+
+ gsu_check_arg_count $# 1 1
+ if [[ $ret -lt 0 ]]; then
+ gsu_err_msg
+ exit 1
+ fi
+
+ ret=-$E_GSU_GETOPTS
+ result="invalid optstring $1"
+ if [[ -z "$1" || "$1" =~ "::" ]]; then
+ gsu_err_msg
+ exit 1
+ fi
+
+ for ((i=0; i < ${#1}; i++)); do
+ c=${1:$i:1}
+ case "$c" in
+ [a-zA-Z:]);;
+ *)
+ ret=-$E_GSU_GETOPTS
+ result="invalid character $c in optstring"
+ gsu_err_msg
+ exit 1
+ esac
+ done
+ result="local opt"
+ for ((i=0; i < ${#1}; i++)); do
+ c1=${1:$i:1}
+ c2=${1:$(($i + 1)):1}
+ result+=" o_$c1"
+ if [[ "$c2" = ":" ]]; then
+ let i++
+ else
+ result+="=false"
+ fi
+ done
+ result+="
+ OPTIND=1
+ while getopts $1 opt \"\$@\"; do
+ case \"\$opt\" in
+"
+ for ((i=0; i < ${#1}; i++)); do
+ c1=${1:$i:1}
+ c2=${1:$(($i + 1)):1}
+ result+="$tab$tab$c1) o_$c1="
+ if [[ "$c2" = ":" ]]; then
+ result+="\"\$OPTARG\""
+ let i++
+ else
+ result+="true"
+ fi
+ result+=";;$cr"
+ done
+ result+="
+ *)
+ ret=-\$E_GSU_GETOPTS
+ result=\"invalid option given\"
+ return
+ ;;
+ esac
+ done
+ shift \$((\$OPTIND - 1))
+"
+ ret=$GSU_SUCCESS
+}
+export -f gsu_getopts
+
gsu()
{
local i
-
_gsu_self="$(basename $0)"
gsu_name="${gsu_name:=$_gsu_self}"
gsu_config_var_prefix="${gsu_config_var_prefix:=$gsu_name}"
fi
arg="$1"
shift
+ # check internal commands
+ if [[ "$arg" = "help" || "$arg" = "man" || "$arg" = "prefs" ]]; then
+ _com_$arg "$@"
+ if [[ "$ret" -lt 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 test $ret -lt 0; then
+ if [[ "$ret" -lt 0 ]]; then
gsu_err_msg
exit 1
fi
exit 0
fi
done
+
ret=-$E_GSU_BAD_COMMAND
result="$arg"
gsu_err_msg
projects / gsu.git / blobdiff