10thfloor · October 8, 2015 12:53 · Aug 31, 2013 · Aug 31, 2013
diff --git a/watch.sh b/watch.sh
@@ -14,7 +14,7 @@ shift
 cmd=$*
 sha=0
 update_sha() {
-  sha=`ls -lR $path | sha1sum`
+  sha=`ls -lR --time-style=full-iso $path | sha1sum`
 }
 update_sha
 previous_sha=$sha

diff --git a/watch.sh b/watch.sh
@@ -0,0 +1,44 @@
+#!/usr/bin/env bash
+# script:  watch
+# author:  Mike Smullin <[email protected]>
+# license: GPLv3
+# description:
+#   watches the given path for changes
+#   and executes a given command when changes occur
+# usage:
+#   watch <path> <cmd...>
+#
+
+path=$1
+shift
+cmd=$*
+sha=0
+update_sha() {
+  sha=`ls -lR $path | sha1sum`
+}
+update_sha
+previous_sha=$sha
+build() {
+  echo -en " building...\n\n"
+  $cmd
+  echo -en "\n--> resumed watching."
+}
+compare() {
+  update_sha
+  if [[ $sha != $previous_sha ]] ; then
+    echo -n "change detected,"
+    build
+    previous_sha=$sha
+  else
+    echo -n .
+  fi
+}
+trap build SIGINT
+trap exit SIGQUIT
+
+echo -e  "--> Press Ctrl+C to force build, Ctrl+\\ to exit."
+echo -en "--> watching \"$path\"."
+while true; do
+  compare
+  sleep 1
+done