From 3c9f2ee5ea8c7fe57864cad38f4f6188c569fa5d Mon Sep 17 00:00:00 2001
From: Simon Ruderich <simon@ruderich.org>
Date: Sun, 14 Mar 2010 01:13:49 +0100
Subject: [PATCH] lib.sh: Fix installed() for which with no output in case of
 error.

---
 lib.sh                |  2 +-
 tests/lib.sh.test     | 12 ++++++++++++
 tests/lib.sh.test.out |  2 ++
 3 files changed, 15 insertions(+), 1 deletion(-)

diff --git a/lib.sh b/lib.sh
index d9b14c5..1fa3c8f 100644
--- a/lib.sh
+++ b/lib.sh
@@ -11,7 +11,7 @@ unset LS_COLORS
 # 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 }'
+    which $1 2>&1 | perl -e '$_ = <>; if (not m{^/}) { exit 1 }'
 }
 
 # Print the current OS. The following OS are supported at the moment:
diff --git a/tests/lib.sh.test b/tests/lib.sh.test
index e8d5053..3568c47 100644
--- a/tests/lib.sh.test
+++ b/tests/lib.sh.test
@@ -41,6 +41,18 @@ echo stupid which
 installed ls && echo ls installed
 installed doesnt-exist && echo doesnt-exist installed
 
+# which with proper exit codes and no output in case of an error.
+which() {
+    if [ $1 = ls ]; then
+        echo /bin/ls
+    else
+        return 1
+    fi
+}
+echo different which
+installed ls && echo ls installed
+installed doesnt-exist && echo doesnt-exist installed
+
 
 # Tests for generate().
 echo "Simple test file for generate() using m4.
diff --git a/tests/lib.sh.test.out b/tests/lib.sh.test.out
index 7139144..17d7b2c 100644
--- a/tests/lib.sh.test.out
+++ b/tests/lib.sh.test.out
@@ -4,6 +4,8 @@ stderr which
 ls installed
 stupid which
 ls installed
+different which
+ls installed
 m4: generating 'tmp/test' from 'tmp/test.m4' with options '-DTEST=m4'
 ###################################
 # WARNING! DO NOT EDIT THIS FILE! #
-- 
2.45.2