# Setup functions and settings used in subdirectories. # # Their setup.sh script sources this file. # Copyright (C) 2009-2013 Simon Ruderich # # 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, see . # csh gives the error "Unknown colorls variable `su'." when used with newer # options supported by Zsh or GNU ls. unset LS_COLORS # Check if the given program is installed. `type` is portable, `which` is not. installed() { type "$1" >/dev/null 2>&1 } # Get the path of the given program. Thanks to Gilles on [1] (read on # 2013-03-10) for the PATH-walking idea. `which` is not portable and `type` # has no well-formed output format. # # [1]: http://unix.stackexchange.com/questions/4988/how-do-i-test-to-see-if-an-application-exists-in-path/4991 installed_path() { test -z "$1" && return 1 # Keep IFS change local. ( IFS=: # Walk PATH. for directory in $PATH; do if test -x "$directory/$1"; then echo "$directory/$1" return 0 fi done return 1 ) } # Usage: sed_i ... # # Uses .tmp as temporary file. sed -i is not compatible due to different # implementations. sed_i() { # Get last argument. last= for x; do last="$x" done sed "$@" >"$last".tmp mv "$last".tmp "$last" } # Print the current OS. The following OS are supported at the moment: # - Debian (debian) # - Gentoo (gentoo) # - Mac OS X (darwin) # - Solaris/OpenSolaris (sun) # - FreeBSD (freebsd) # If an unsupported OS is used an error is printed. os() { if test -f /etc/debian_version; then echo debian elif test -f /etc/gentoo-release; then echo gentoo elif test x`uname` = xDarwin; then echo darwin elif test x`uname` = xSunOS; then echo sun elif test x`uname` = xFreeBSD; then echo freebsd else echo unsupported OS! >&2 return 1 fi } # Creates a symbolic link for file $1 in dirname of $2 with name of basename # $2. # # `./link.sh example ~/.examplerc` creates a symbolic link to example # (wherever it is located) in ~/ named .examplerc. link() { local pwd base source target >/dev/null 2>&1 || true # Get all necessary paths. pwd=`pwd` base=`echo "$2" | sed "s|\~|$HOME|"` # expand ~, some sh don't do it base=`dirname "$base"` source=`echo "$pwd/$1" | sed "s|$base/||"` target=`basename "$2"` # Go to the directory where the link is going to be created. cd "$base" # Abort if the target file exists and is no symbolic link. Prevents # overwriting real files. if ( test -f "$target" && test ! -h "$target" ) || \ ( test -s "$target" && test ! -h "$target" ); then echo "link(): target '$target' exists already and is no symbolic link!" >&2 exit 1 fi # Make sure the source exists (is file, directory or link). if test ! -f "$source" && test ! -d "$source" && test ! -h "$source"; then echo "link(): source '$source' doesn't exist!" >&2 exit 1 fi # Create the new symbolic link; remove the old one if necessary. echo "link(): linking '$source' to '$target'" rm -f "$target" ln -s "$source" "$target" # Go back to the directory where we were before. cd "$pwd" } # Write a warning to $1 to make clear it should not be modified. $2 is the # source for the generated file. Also print a message to stdout that the file # $1 was generated from $2 using the command $3 with options $4. warning() { echo "###################################" > $1 echo "# WARNING! DO NOT EDIT THIS FILE! #" >> $1 echo "###################################" >> $1 echo >> $1 echo "# It was generated from $2 on `date`." >> $1 echo >> $1 # Display given options if there were any (Zsh has a problem with $options # as variable name). option= if test -n "$4"; then option=" with options '$4'" fi # Write message to stdout. echo "$3: generating '$1' from '$2'$option" unset option } # Generate a file using several methods. A warning not to edit it is # automatically added to the created file and a message printed to stdout # through warning(). # # The following commands are possible; the file extension for the source file # in brackets. # # - m4 (.m4): pipe $2.m4 through m4 then write it to $2 # - awk (.in): pipe $2.in through awk then write it to $2 # - perl (.in): pipe $2.in through perl then write it to $2 # - cat ($3): copy $2$3 to $2 generate() { # Get command and target file. command="$1" file="$2" # Remove arguments from list. shift shift # Set extension for the used commands. When cat is used $3 is used as # extension. if test x"$command" = xm4; then extension=.m4 elif test x"$command" = xawk -o x"$command" = xperl; then extension=.in elif test x"$command" = xcat; then extension="$1" # is $3 in reality, $1 because of shifting shift # Print a warning and exit if an unsupported command is used. else echo "generate(): command '$command' not supported!" >&2 exit 1 fi # Add warning to file and write a message to stdout. warning "$file" "$file$extension" $command "$*" # Generate $file from $file$extension using the given command. cat "$file$extension" | $command "$@" >> "$file" unset command file }