[Pcmanfm-develop] [PATCH 1/2] [pcmanfm] autogen.sh: Properly detect automake versions

[Chirantan E. <chi...@gm...>]

Added a version comparison function to properly check if the installed
version of automake is higher than the required version.

Signed-off-by: Chirantan Ekbote <chi...@gm...>
---
 autogen.sh | 40 ++++++++++++++++++++++++++++++++++++----
 1 file changed, 36 insertions(+), 4 deletions(-)

diff --git a/autogen.sh b/autogen.sh
index 69f4f0a..26dd399 100755
--- a/autogen.sh
+++ b/autogen.sh
@@ -4,11 +4,42 @@ AC_VERSION=
 AUTOMAKE=${AUTOMAKE:-automake}
 AM_INSTALLED_VERSION=$($AUTOMAKE --version | sed -e '2,$ d' -e 's/.* \([0-9]*\.[0-9]*\).*/\1/')
 
-# FIXME: we need a better way for version check later.
-if [ "$AM_INSTALLED_VERSION" != "1.10" \
-    -a "$AM_INSTALLED_VERSION" != "1.11" \
-    -a "$AM_INSTALLED_VERSION" != "1.12" ];then
+# Source: http://stackoverflow.com/a/4025065w
+vercomp () {
+    if [[ $1 == $2 ]]
+    then
+        return 0
+    fi
+    local IFS=.
+    local i ver1=($1) ver2=($2)
+    # fill empty fields in ver1 with zeros
+    for ((i=${#ver1[@]}; i<${#ver2[@]}; i++))
+    do
+        ver1[i]=0
+    done
+    for ((i=0; i<${#ver1[@]}; i++))
+    do
+        if [[ -z ${ver2[i]} ]]
+        then
+            # fill empty fields in ver2 with zeros
+            ver2[i]=0
+        fi
+        if ((10#${ver1[i]} > 10#${ver2[i]}))
+        then
+	    # $1 is greater
+            return 1
+        fi
+        if ((10#${ver1[i]} < 10#${ver2[i]}))
+        then
+	    # $2 is greater
+            return 2
+        fi
+    done
+    return 0
+}
+
+vercomp $AM_INSTALLED_VERSION 1.11
+if [[ $? == 2 ]];then
 	echo
 	echo "You must have automake > 1.10 or 1.11 installed."
 	echo "Install the appropriate package for your distribution,"
-- 
1.8.1