First commit
This commit is contained in:
parent
476a9ea4d3
commit
4bceffeed1
|
@ -0,0 +1,184 @@
|
|||
#!/bin/bash
|
||||
##
|
||||
## EasyOptions 2015.2.28 Copyright (c) 2013, 2014 Renato Silva BSD licensed
|
||||
##
|
||||
## This script is supposed to parse command line arguments in a way that, even though its implementation is not trivial, it should be easy and smooth to use.
|
||||
## For using this script, simply document your target script using double-hash comments, like this:
|
||||
##
|
||||
## ## Program Name v1.0 Copyright (C) Someone
|
||||
## ##
|
||||
## ## This program does something. Usage:
|
||||
## ## @#script.name [option]
|
||||
## ##
|
||||
## ## Options:
|
||||
## ## -h, --help All client scripts have this by default,
|
||||
## ## it shows this double-hash documentation.
|
||||
## ##
|
||||
## ## -o, --option This option will get stored as option=yes.
|
||||
## ## Long version is mandatory, and can be specified before or after short version.
|
||||
## ##
|
||||
## ## --some-boolean This will get stored as some_boolean=yes.
|
||||
## ##
|
||||
## ## --some-value=VALUE This will get stored as some_value=VALUE,
|
||||
## ## where VALUE is the actual value specified. The equal sign is optional and can be replaced with blank space. Short version
|
||||
## ## is not available in this format.
|
||||
##
|
||||
## The above comments work both as source code documentation and as help text, as well as define the options supported by your script. Parsing of the options
|
||||
## from such documentation is quite slow, but at least there is not any duplication of the options specification. The string @#script.name will be replaced with
|
||||
## the actual script name.
|
||||
##
|
||||
## After writing your documentation, you simply source this script. Then all command line options will get parsed into the corresponding variables, as described
|
||||
## above. You can then check their values for reacting to them. Regular arguments will be available in the $arguments array.
|
||||
##
|
||||
## In fact, this script is an example of itself. You are seeing this help message either because you are reading the source code, or you have called the script
|
||||
## in command line with the --help option.
|
||||
##
|
||||
## For better speed, you may want to define the options in source code yourself, so they do not need to be parsed from the documentation. The side effect is
|
||||
## that when changing them, you will need to update both the documentation and the source code. You define the options statically like this:
|
||||
##
|
||||
##
|
||||
## options=(o=option some-boolean some-value=?)
|
||||
##
|
||||
show_error() {
|
||||
echo "Error: $1." >&2
|
||||
echo "See --help for usage and options." >&2
|
||||
}
|
||||
parse_documentation() {
|
||||
documentation="$(grep "^##" "$(which "$0")")(no-trim)"
|
||||
documentation=$(echo "$documentation" | sed -r "s/## ?//" | sed -r "s/@script.name/$(basename "$0")/g" | sed "s/@#/@/g")
|
||||
documentation=${documentation%(no-trim)}
|
||||
}
|
||||
parse_options() {
|
||||
local short_option_vars
|
||||
local short_options
|
||||
local documentation
|
||||
local next_is_value
|
||||
local argument
|
||||
local option
|
||||
local option_name
|
||||
local option_value
|
||||
local option_var
|
||||
local known_option
|
||||
local known_option_name
|
||||
local known_option_var
|
||||
# Parse known options from documentation
|
||||
if [[ -z ${options+defined} ]]; then
|
||||
parse_documentation
|
||||
while read -r line; do
|
||||
case "$line" in
|
||||
"-h, --help"*) continue ;;
|
||||
"--help, -h"*) continue ;;
|
||||
-*," "--*) option=$(echo "$line" | awk -F'(^-|, --| )' '{ print $2"="$3 }') ;;
|
||||
--*," "-*) option=$(echo "$line" | awk -F'(--|, -| )' '{ print $3"="$2 }') ;;
|
||||
--*=*) option=$(echo "$line" | awk -F'(--|=| )' '{ print $2"=?" }') ;;
|
||||
--*" "*) option=$(echo "$line" | awk -F'(--| )' '{ print $2 }') ;;
|
||||
*) continue ;;
|
||||
esac
|
||||
options+=("$option")
|
||||
done <<< "$documentation"
|
||||
fi
|
||||
options+=(h=help)
|
||||
arguments=()
|
||||
# Prepare known options
|
||||
for option in "${options[@]}"; do
|
||||
option_var=${option#*=}
|
||||
option_name=${option%=$option_var}
|
||||
if [[ "${#option_name}" = "1" ]]; then
|
||||
short_options="${short_options}${option_name}"
|
||||
if [[ "${#option_var}" > "1" ]]; then
|
||||
short_option_vars+=("$option_var")
|
||||
fi
|
||||
fi
|
||||
done
|
||||
# Extract regular arguments
|
||||
index=1
|
||||
parameters=()
|
||||
for argument in "$@"; do
|
||||
if [[ "$argument" = -* ]]; then
|
||||
parameters+=("$argument")
|
||||
for known_option in "${options[@]}"; do
|
||||
known_option_var=${known_option#*=}
|
||||
known_option_name=${known_option%=$known_option_var}
|
||||
if [[ "$known_option_var" = "?" && "$argument" = --$known_option_name ]]; then
|
||||
next_is_value="yes"
|
||||
break
|
||||
fi
|
||||
done
|
||||
else
|
||||
if [[ -z "$next_is_value" ]]; then
|
||||
arguments+=("${!index}")
|
||||
else
|
||||
parameters+=("$argument")
|
||||
fi
|
||||
next_is_value=""
|
||||
fi
|
||||
index=$((index + 1))
|
||||
done
|
||||
set -- "${parameters[@]}"
|
||||
# Parse the provided options
|
||||
while getopts ":${short_options}-:" option; do
|
||||
option="${option}${OPTARG}"
|
||||
option_value=""
|
||||
# Set the corresponding variable for known options
|
||||
for known_option in "${options[@]}" "${short_option_vars[@]}"; do
|
||||
known_option_var=${known_option#*=}
|
||||
known_option_name=${known_option%=$known_option_var}
|
||||
# Short option
|
||||
if [[ "$option" = "$known_option_name" ]]; then
|
||||
|
||||
# Short option
|
||||
if [[ "$option" = "$known_option_name" ]]; then
|
||||
option_value="yes"
|
||||
known_option_var=$(echo "$known_option_var" | tr "-" "_")
|
||||
eval "$known_option_var=\"$option_value\""
|
||||
break
|
||||
# Long option
|
||||
elif [[ "$option" = -$known_option_name && "$known_option_var" != "?" ]]; then
|
||||
option_value="yes"
|
||||
known_option_var=$(echo "$known_option_var" | tr "-" "_")
|
||||
eval "$known_option_var=\"$option_value\""
|
||||
break
|
||||
# Long option with value in next parameter
|
||||
elif [[ "$option" = -$known_option_name && "$known_option_var" = "?" ]]; then
|
||||
eval option_value="\$$OPTIND"
|
||||
if [[ -z "$option_value" || "$option_value" = -* ]]; then
|
||||
show_error "you must specify a value for --$known_option_name"
|
||||
exit 1
|
||||
fi
|
||||
OPTIND=$((OPTIND + 1))
|
||||
known_option_var=$(echo "$known_option_name" | tr "-" "_")
|
||||
eval "$known_option_var=\"$option_value\""
|
||||
break
|
||||
# Long option with value after equal sign
|
||||
elif [[ "$option" = -$known_option_name=* && "$known_option_var" = "?" ]]; then
|
||||
option_value=${option#*=}
|
||||
known_option_var=$(echo "$known_option_name" | tr "-" "_")
|
||||
eval "$known_option_var=\"$option_value\""
|
||||
break
|
||||
# Long option with unnecessary value
|
||||
elif [[ "$option" = -$known_option_name=* && "$known_option_var" != "?" ]]; then
|
||||
option_value=${option#*=}
|
||||
show_error "--$known_option_name does not accept a value, you specified \"$option_value\""
|
||||
exit 1
|
||||
fi
|
||||
done
|
||||
# Unknown option
|
||||
if [[ -z "$option_value" ]]; then
|
||||
# Unknown option
|
||||
if [[ -z "$option_value" ]]; then
|
||||
option=${option%%=*}
|
||||
[[ "$option" = \?* ]] && option=${option#*\?}
|
||||
show_error "unrecognized option -$option"
|
||||
exit 1
|
||||
fi
|
||||
# Help option
|
||||
if [[ -n "$help" ]]; then
|
||||
[[ -z "$documentation" ]] && parse_documentation
|
||||
echo "$documentation"
|
||||
exit
|
||||
fi
|
||||
done
|
||||
}
|
||||
parse_options "$@"
|
||||
|
||||
|
Loading…
Reference in New Issue