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#!/bin/bash
# Copyright (C) 2013-2020 Miquel Sabaté Solà <mikisabate@gmail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
# Print the usage string.
__g_usage() {
echo "usage: g [-h | --help] [-v | --version] <command> [<args>]"
}
# Print the help message.
__g_help() {
__g_usage
echo -e "\nThe g commands are:"
tab=$'\t'
column -t -s $'\t' <<HERE
add${tab}Add a new shortcut.
rm${tab}Remove a shorcut.
list${tab}List all the available shortcuts.
HERE
}
# Fill the hash of shortcuts with the contents of the __g_file.
__g_get_shortcuts() {
local word=""
__g_shortcuts=()
# shellcheck disable=SC2162
while read line; do
if [ -n "$line" ]; then
if [ -z "$word" ]; then
word=$line
else
__g_shortcuts[$word]=$(eval echo "$line")
word=""
fi
fi
done < "$__g_file"
}
# Echoes the keys of the current shortcuts. This is needed to cope with some
# differences between GNU Bash and ZSH.
__g_fetch_shortcut_keys() {
if [ -n "$ZSH_VERSION" ]; then
# shellcheck disable=SC2154
echo "${(@k)__g_shortcuts}"
else
# shellcheck disable=SC2124
echo "${!__g_shortcuts[@]}"
fi
}
# Save the computed shortcuts into the __g_file.
__g_save_shortcuts() {
# Erase the contents of the __g_file.
:>"$__g_file"
# And write the hash into the __g_file.
keys=$(__g_fetch_shortcut_keys)
for i in $keys; do
echo "$i" >> "$__g_file"
echo "${__g_shortcuts[$i]}" >> "$__g_file"
done
}
# Returns true if the given parameter is a keyword, false otherwise.
__g_is_keyword() {
case "$1" in
add | rm | list | -v | --version | -h | --help)
return 0
;;
*)
return 1
esac
}
# It returns a string with all the elements of the given array joined by slash
# characters.
__g_join_path() {
local IFS="/"; echo "$*";
}
# Replacement for the non-standard `realpath` command. Implemented taken from
# https://github.com/travis-ci/gimme.
__g_realpath() {
# shellcheck disable=SC2005
[ -d "$1" ] && echo "$(cd "$1" && pwd)" || echo "$(cd "$(dirname "$1")" \
&& pwd)/$(basename "$1")"
}
# The main function for this script.
g() {
version="0.3.9"
cmd="$1"
if [ -z "$cmd" ]; then
__g_help
return 1
fi
__g_file=$HOME/.gfile
declare -A __g_shortcuts
# Make sure that the __g_file actually exists.
if [ -n "$GFILE" ]; then
__g_file="$GFILE"
fi
:>> "$__g_file"
# Parse the command.
case "$cmd" in
-v | --version)
cat <<HERE
g version $version
Copyright (C) 2013-2020 Miquel Sabaté Solà <mikisabate@gmail.com>
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>.
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
HERE
;;
-h | --help)
__g_help
;;
add)
if [ "$#" = "2" ]; then
p=$(pwd)
else
if [ "$#" = "3" ]; then
p="$3"
else
echo "usage: g add <name> [path]"
return 1
fi
fi
if __g_is_keyword "$2"; then
echo "Cannot use '$2': keyword."
return 1
fi
__g_get_shortcuts
__g_shortcuts[$2]=$(__g_realpath "$p")
__g_save_shortcuts
;;
rm)
if [ "$#" != "2" ]; then
echo "usage: g rm <name>"
return 1
fi
__g_get_shortcuts
unset "__g_shortcuts[$2]"
__g_save_shortcuts
;;
list)
__g_get_shortcuts
keys=$(__g_fetch_shortcut_keys)
if [[ "$#" = "2" && "$2" = "--keys" ]]; then
str=""
for i in $keys; do
str="$str $i"
done
echo "$str"
else
for i in $keys; do
if [ -d "${__g_shortcuts[$i]}" ]; then
echo -e "$i\t=> ${__g_shortcuts[$i]}"
else
echo -e "$i\t=> ${__g_shortcuts[$i]} (broken)"
fi
done | sort | column -t -s $'\t'
fi
;;
*)
__g_get_shortcuts
# Split the path and check whether the first element is a shortcut or
# not.
if [ -n "$ZSH_VERSION" ]; then
# shellcheck disable=SC2154
p=( "${(@s|/|)cmd}" )
init="${p[1]}"
else
# shellcheck disable=SC2124
IFS='/' read -r -a p <<< "$cmd"
init="${p[0]}"
fi
if [ -z "${__g_shortcuts[$init]}" ]; then
echo -e "Unknown shortcut \`$init'.\n"
__g_usage
return 1
else
# Expand the shortcut and append the remaining parts of the path.
if [ -n "$ZSH_VERSION" ]; then
p[1]="${__g_shortcuts[$init]}"
else
p[0]="${__g_shortcuts[$init]}"
fi
cd "$(__g_join_path "${p[@]}")" || return 1
fi
;;
esac
return 0
}
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