-#!/bin/sh
+#!/bin/bash
# gsu -- the global subcommand utility
-# (C) 2006-2009 Andre Noll
+# (C) 2006-2011 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_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
+# Each line matching this is recognized as a subcommand. The name
+# of the subcommand is the first subexpression.
+export gsu_command_regex='^com_\([a-zA-Z_0-9]\+\)()'
+
_gsu_available_commands()
{
- result="$( (printf "help\nman\n"; grep "^com_[a-z_]\+()" $0) \
- | sed -e 's/^com_//' -e 's/()//' \
- | sort \
- | tr '\n' ' ')"
- ret=$GSU_SUCCESS
+ result="$({
+ printf "help\nman\nprefs\n"
+ sed -ne "s/$gsu_command_regex/\1/g;T;p" $0
+ } | sort | tr '\n' ' ')"
}
export -f _gsu_available_commands
}
export -f _gsu_print_available_commands
+export gsu_prefs_txt="
+Print the current preferences.
+
+Usage: prefs [-e]
+
+If -e is given, the config file is opened with the default editor. Without
+options, the command prints out a list of all cmt config variables, together
+with their current value and the default value."
+_com_prefs()
+{
+ local i conf="${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 < ${#gsu_options[@]}; i++)); do
+ local name= option_type= default_value= required=
+ local description= help_text=
+ eval "${gsu_options[$i]}"
+ eval val='"$'${gsu_config_var_prefix}_$name'"'
+ case "$required" in
+ true|yes)
+ printf "# required"
+ ;;
+ *)
+ printf "# optional"
+ ;;
+ esac
+ printf " $option_type: $description"
+ if [[ "$required" != "yes" && "$required" != "true" ]]; then
+ printf " [$default_value]"
+ fi
+ echo
+ [[ -n "$help_text" ]] && sed -e '/^[ ]*$/d; s/^[ ]*/# /g' <<< "$help_text"
+ printf "$name=$val"
+ [[ "$val" == "$default_value" ]] && printf " # default"
+ echo
+ done
+}
+export -f _com_prefs
+
export gsu_man_txt="
Print the manual.
Usage: man"
-com_man()
+_com_man()
{
local equal_signs="=================================================="
local minus_signs="--------------------------------------------------"
done
ret=$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 "--"
-
- grep -A 2 "^com_\([a-zA-Z_0-9]\+\)()" $0) \
- | grep -v -- '--' \
- | sed -e '/^com_\([a-zA-Z_0-9]\+\)()/bs' \
+ {
+ 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$gsu_prefs_txt" | head -n 4; echo "--"
+ grep -A 2 "$gsu_command_regex" $0
+ } | grep -v -- '--' \
+ | sed -e "/$gsu_command_regex/bs" \
-e 'H;$!d;x;s/\n//g;b' \
-e :s \
-e 'x;s/\n//g;${p;x;}' \
- | sed -e 's/^com_\([a-zA-Z_0-9]\+\)()#*/\1\t/' \
+ | sed -e "s/${gsu_command_regex}#*/\1\t/" \
| sort \
| while read a b; do
printf "$a\t"
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
ret=$GSU_SUCCESS
return
fi
+ if test "$1" = "prefs"; then
+ echo "$gsu_prefs_txt"
+ ret=$GSU_SUCCESS
+ return
+ fi
ret=$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
-_gsu_init_config()
+# internal gsu function that syntactically checks the gsu_options array
+# for errors and parses the config file.
+_gsu_check_options()
{
- local name val default_val required ty comment
+ local i conf="${gsu_config_file:=$HOME/.$gsu_name.rc}" val
- # set default values
- while read name default_val required ty comment; do
- if test -z "$name"; then
- continue
- fi
- eval ${gsu_self}_$name="$default_val"
- done << EOF
- $gsu_config_vars
-EOF
- result="$HOME/.${gsu_self}rc"
- # overwrite by custom configuration
- if [ -r "$result" ]; then
- ret=-$E_GSU_SOURCE
- if ! . "$result"; then
- gsu_err_msg
- exit 1
+ for ((i=0; i < ${#gsu_options[@]}; i++)); do
+ eval "${gsu_options[$i]}"
+ eval val='"'\$$name'"'
+ eval orig_${gsu_config_var_prefix}_$name='"'${val}'"'
+ done
+
+ [[ -r "$conf" ]] && source "$conf"
+
+ for ((i=0; i < ${#gsu_options[@]}; i++)); do
+ local name= option_type= default_value= required=
+ local description= help_text=
+ local val orig_val
+
+ eval "${gsu_options[$i]}"
+
+
+ # Check name. It must be non-empty and consist of [a-zA-Z_0-9]
+ # only. Moreover it must not start with [a-zA-Z].
+
+ ret=-$E_GSU_BAD_CONFIG_VAR
+ 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;
+ [[ $? -ne 0 ]] && return
+
+ eval orig_val='"'\$orig_${gsu_config_var_prefix}_$name'"'
+ if [[ -z "$orig_val" ]]; then
+ eval val='"'\$$name'"'
+ else
+ val="$orig_val"
fi
- fi
- while read name default_val required ty comment; do
- [ -z "$name" ] && continue
- eval val="\$$name"
- # abort if any required config var remains unset
- ret=-$_E_GSU_CONFIG
- if [ "$val" = "-" -a "$required" = "required" ]; then
+ case "$required" in
+ true|yes)
+ ret=-$E_GSU_NEED_VALUE
result="$name"
+ [[ -z "$val" ]] && return
+ ;;
+ false|no)
+ ;;
+ *)
+ ret=-$E_GSU_BAD_BOOL
+ result="required: $required, name: $name, val: $val"
+ return
+ esac
+
+ 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
+ string)
+ ;;
+ num)
+ gsu_is_a_number "$val"
+ [[ $ret -lt 0 ]] && return
+ ;;
+ *)
+ ret=-$E_GSU_BAD_OPTION_TYPE
+ result="$name/$option_type"
+ return
+ esac
+ done
+ ret=$GSU_SUCCESS
+}
+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" ]] || grep -q '::' <<< "$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
- if [ $ty == "number" ]; then
- gsu_is_a_number "$val"
- if [ $ret -lt 0]; then
- gsu_err_msg
- exit 1
- 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
- eval export ${gsu_self}_$name
- done << EOF
- $config_vars
-EOF
+ result+=";;$cr"
+ done
+ result+="
+ *)
+ ret=-\$E_GSU_GETOPTS
+ result=\"invalid option given\"
+ return
+ ;;
+ esac
+ done
+ shift \$((\$OPTIND - 1))
+"
+ ret=$GSU_SUCCESS
}
-export -f _gsu_init_config
+export -f gsu_getopts
gsu()
{
local i
-
_gsu_self="$(basename $0)"
+ gsu_name="${gsu_name:=$_gsu_self}"
+ gsu_config_var_prefix="${gsu_config_var_prefix:=$gsu_name}"
_gsu_init_errors
- _gsu_init_config
+ _gsu_check_options
+ if [[ "$ret" -lt 0 ]]; then
+ if [[ "$1" != "help" && "$1" != "man" ]]; then
+ gsu_err_msg
+ exit 1
+ fi
+ fi
_gsu_available_commands
gsu_cmds="$result"
if test $# -eq 0; then
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
exit 1
}
export -f gsu
+
+# TODO: gsu_strerror: get error string
projects / gsu.git / blobdiff