# Check if the given program is installed. Returns 0 if it exists, 1
# otherwise; so it can be used in if.
installed() {
- which $1 2>&1 | perl -ne 'if (not m{^/}) { exit 1 }'
+ # Thanks to Rado in #awk on Freenode (2010-03-29 01:34) for the END tip to
+ # also work with empty stdin, and to prince_jammys in #awk on Freenode
+ # (2010-03-29 02:20) for a shorter syntax for "$0 !~".
+ which $1 2>&1 | awk '{ if (!/^\//) exit 1 }
+ END { if (NR == 0) 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.
+# Print the current OS. The following OS are supported at the moment:
+# - Debian (debian)
+# - Gentoo (gentoo)
+# - Mac OS X (darwin)
+# - Solaris/OpenSolaris (sun)
+# If an unsupported OS is used an error is printed.
os() {
if [ -f /etc/debian_version ]; then
echo debian
echo gentoo
elif [ x`uname` = xDarwin ]; then
echo darwin
+ elif [ x`uname` = xSunOS ]; then
+ echo sun
else
echo unsupported OS! >&2
return 1
link() {
# Get all necessary paths.
pwd=`pwd`
- base=`dirname "$2"`
+ 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 "$2"`
# Abort if the target file exists and is no symbolic link. Prevents
# overwriting real files.
- if [ -e "$target" -a ! -h "$target" ]; then
+ if [ \( -f "$target" -a ! -h "$target" \) -o \
+ \( -s "$target" -a ! -h "$target" \) ]; 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 [ ! -f "$source" -a ! -d "$source" -a ! -h "$source" ]; then
echo "link(): source '$source' doesn't exist!" >&2
exit 1
fi