# 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.
installed() {
- which $1 > /dev/null
+ which $1 2>&1 | perl -ne 'if (not m{^/}) { exit 1 }'
+}
+
+# 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.
+os() {
+ if [ -f /etc/debian_version ]; then
+ echo debian
+ elif [ -f /etc/gentoo-release ]; then
+ echo gentoo
+ elif [ x`uname` = xDarwin ]; then
+ echo darwin
+ 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
# Get all necessary paths.
pwd=`pwd`
base=`dirname "$2"`
- source=`echo -n "$pwd/$1" | sed "s|$base/||"`
+ source=`echo "$pwd/$1" | sed "s|$base/||"`
target=`basename "$2"`
# Go to the directory where the link is going to be created.
unset pwd base source target
}
-# 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.
+# 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 [ -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.
#
-# All arguments (except the first which is the filename) are passed to m4.
-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
- # 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
+ # Set extension for the used commands. When cat is used $3 is used as
+ # extension.
+ if [ x"$command" = xm4 ]; then
+ extension=.m4
+ elif [ x"$command" = xawk -o x"$command" = xperl ]; then
+ extension=.in
+ elif [ 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
- # Process $1.m4 with m4 using the given options.
- echo "m4(): generating '$file' from '$file.m4' with options '$*'"
- $m4 $* $file.m4 >> $file
+ # Add warning to file and write a message to stdout.
+ warning "$file" "$file$extension" $command "$*"
+ # Generate $file from $file$extension using the given command.
+ cat "$file$extension" | $command "$@" >> "$file"
- unset file
+ unset command file
}