Add ability to configure path for readline

gitwatch.sh

@@ -97,12 +97,12 @@ shelp () {
     echo "It is therefore recommended to terminate the script before changing the repo's"
     echo "config and restarting it afterwards."
     echo ""
-    echo "By default, gitwatch tries to use the binaries \"git\" and \"inotifywait\","
-    echo "expecting to find them in the PATH (it uses 'which' to check this and  will"
-    echo "abort with an error if they cannot be found). If you want to use binaries"
-    echo "that are named differently and/or located outside of your PATH, you can define"
-    echo "replacements in the environment variables GW_GIT_BIN and GW_INW_BIN for git"
-    echo "and inotifywait, respectively."
+    echo "By default, gitwatch tries to use the binaries \"git\", \"inotifywait\", and"
+    echo "\"readline\", expecting to find them in the PATH (it uses 'which' to check this"
+    echo "and will abort with an error if they cannot be found). If you want to use"
+    echo "binaries that are named differently and/or located outside of your PATH, you can"
+    echo "define replacements in the environment variables GW_GIT_BIN, GW_INW_BIN, and"
+    echo "GW_RL_BIN for git, inotifywait, and readline, respectively."
 }
 
 # print all arguments to stderr
@@ -149,7 +149,7 @@ if [ $# -ne 1 ]; then # If no command line arguments are left (that's bad: no ta
     exit # and exit
 fi
 
-# if custom bin names are given for git or inotifywait, use those; otherwise fall back to "git" and "inotifywait"
+# if custom bin names are given for git, inotifywait, or readlink, use those; otherwise fall back to "git", "inotifywait", and "readlink"
 if [ -z "$GW_GIT_BIN" ]; then GIT="git"; else GIT="$GW_GIT_BIN"; fi
 
 if [ -z "$GW_INW_BIN" ]; then
@@ -169,6 +169,8 @@ else
     INW="$GW_INW_BIN";
 fi
 
+if [ -z "$GW_RL_BIN" ]; then RL="readlink"; else RL="$GW_RL_BIN"; fi
+
 # Check availability of selected binaries and die if not met
 for cmd in "$GIT" "$INW"; do
 	is_command "$cmd" || { stderr "Error: Required command '$cmd' not found." ; exit 1; }
@@ -184,15 +186,15 @@ trap "cleanup" EXIT # make sure the timeout is killed when exiting script
 
 # Expand the path to the target to absolute path
 if [ "$(uname)" != "Darwin" ]; then
-    IN=$(readlink -f "$1")
+    IN=$($RL -f "$1")
 else
     if is_command "greadlink"; then
       IN=$(greadlink -f "$1")
     else
-      IN=$(readlink -f "$1")
+      IN=$($RL -f "$1")
       if [ $? -eq 1 ]; then
         echo "Seems like your readlink doesn't support '-f'. Running without. Please 'brew install coreutils'."
-        IN=$(readlink "$1")
+        IN=$($RL "$1")
       fi
     fi;
 fi;