X-Git-Url: https://ruderich.org/simon/gitweb/?a=blobdiff_plain;f=lib.sh;h=5abd27898400e44bbaed2c14ec4a45ce80b8f480;hb=8348ecd5e6759f9551fac0431a45c3bdffc36956;hp=9e2308d6adf988de977116d7b28713e52c077fce;hpb=f30437901deddf4e539294eaddcd2f19af1d778b;p=config%2Fdotfiles.git
diff --git a/lib.sh b/lib.sh
index 9e2308d..5abd278 100644
--- a/lib.sh
+++ b/lib.sh
@@ -2,47 +2,114 @@
#
# 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.
+# options supported by Zsh or GNU ls.
unset LS_COLORS
-# Get path to m4 because it's later redefined as function.
-m4=`which m4`
-
-# Check if the given program is installed. Returns 0 if it exists, 1
-# otherwise; so it can be used in if.
+# Check if the given program is installed. `type` is portable, `which` is not.
installed() {
- which $1 | grep -E '^/' > /dev/null
+ 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/$1"
+ return 0
+ fi
+ done
-# Prints the current OS. Supported are Debian (debian), Gentoo (gentoo) and
-# Mac OS X (darwin) at the moment. If an unsupported OS is used an error is
-# printed.
+ return 1
+ )
+}
+
+# Usage: cmd_i ...
+#
+# Run with all arguments (including the last file) and write the result
+# to the temporary file .tmp and then renamed that file to . This
+# can't be done in-place (e.g. cmd file) because it truncates the file.
+cmd_i() {
+ # Get last argument.
+ last=
+ for x; do
+ last="$x"
+ done
+
+ "$@" >"$last".tmp
+ mv "$last".tmp "$last"
+}
+
+# Usage: sed_i ...
+#
+# sed -i is not compatible due to different implementations. See cmd_i.
+sed_i() {
+ cmd_i sed "$@"
+}
+
+# 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 [ -f /etc/debian_version ]; then
+ if test -f /etc/debian_version; then
echo debian
- elif [ -f /etc/gentoo-release ]; then
+ elif test -f /etc/gentoo-release; then
echo gentoo
- elif [ x`uname` = xDarwin ]; then
+ 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 basenmae
+# 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=`dirname "$2"`
- source=`echo -n "$pwd/$1" | sed "s|$base/||"`
+ 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 "$2"`
# Go to the directory where the link is going to be created.
@@ -50,13 +117,14 @@ link() {
# Abort if the target file exists and is no symbolic link. Prevents
# overwriting real files.
- if [ -e "$target" -a ! -h "$target" ]; then
+ if ( test -f "$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.
- if [ ! -e "$source" ]; then
+ # Make sure the source exists (is file, directory or link).
+ if test ! -f "$source" && test ! -d "$source" && test ! -h "$source"; then
echo "link(): source '$source' doesn't exist!" >&2
exit 1
fi
@@ -68,39 +136,69 @@ link() {
# Go back to the directory where we were before.
cd "$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 pwd base source target
+ unset option
}
-# m4 wrapper which uses $1.m4 as template file, feeds it to m4 and writes it
-# to $1 with a warning at the beginning to not edit the generated file.
+# 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().
#
-# All arguments (except the first which is the filename) are passed to m4.
+# The following commands are possible; the file extension for the source file
+# in brackets.
#
-# The following macros are defined: IF and FI. Example:
-# IF(OS, debian)
-# ...
-# FI
-m4() {
- # First argument is file name.
- file=$1
+# - 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"
- # Write a warning to the generated file.
- echo "###################################" > $file
- echo "# WARNING! DO NOT EDIT THIS FILE! #" >> $file
- echo "###################################" >> $file
- echo >> $file
- echo "# It was generated from $file.m4 on `date`." >> $file
- echo >> $file
-
- # Process $1.m4 with m4 using the given options.
- echo "m4(): generating '$file' from '$file.m4' with options '$*'"
- # Add useful macros.
- (echo "define(\`IF', \`ifelse(\`\$1', \`\$2',dnl')dnl
-define(\`FI', \`)dnl')dnl";
- # Run the file (and the default macros) through m4.
- cat $file.m4) | $m4 "$@" >> $file
-
- unset file
+ unset command file
}