From a0bcaf779e11b6e5b0305e11ca8378532f17c2f6 Mon Sep 17 00:00:00 2001
From: "Yann Esposito (Yogsototh)" <Yann.Esposito@gmail.com>
Date: Sun, 6 Oct 2013 14:15:44 +0200
Subject: [PATCH] initial commit

---
 README.md |  9 +++++++++
 watch     | 55 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 64 insertions(+)
 create mode 100644 README.md
 create mode 100755 watch

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..c305c19
--- /dev/null
+++ b/README.md
@@ -0,0 +1,9 @@
+# Watcher
+
+This is a simple script with watch for file modification and execute a
+command when this occurs.
+
+Examples:
+
+    watch ./gen fic1 fic2 dir1
+    watch "echo 'This file changed:' " dir1 dir2
diff --git a/watch b/watch
new file mode 100755
index 0000000..6300957
--- /dev/null
+++ b/watch
@@ -0,0 +1,55 @@
+#!/usr/bin/env zsh
+
+error(){print -- $* >&2; exit 1}
+
+(($#<2)) && error "usage: ${0:t} [once] cmd dirs..."
+
+ONCE=0
+[[ $1 = "once" ]] && { ONCE=1; shift }
+
+(($#<2)) && error "usage: ${0:t} [once] cmd dirs..."
+
+cmd="$1"
+shift
+
+typeset -a listDir
+listDir=( $@ )
+
+isRecentlyModified() {
+    local fic="$1"
+    local mtime=0
+    currenttime=$(date +"%s")
+    case $(uname) in
+        Darwin) mtime=$(stat -f %m $fic);;
+        Linux) mtime=$(stat --printf %Y $fic);;
+        *) mtime=$(stat --printf %Y $fic);;
+    esac
+    (( $currenttime - $mtime  < 2 ))
+}
+
+checkfile=".last_watched"
+((ONCE == 0)) && \
+    [[ -e $checkfile ]] && \
+    isRecentlyModified $checkfile && \
+    error "Wait at least 2 second if you killed the process"
+
+execIfChanged() {
+    isRecentlyModified $1 && { print -- "$cmd $1"; eval "$cmd $1"}
+}
+
+typeset -A listFic
+while true; do
+    listFic=()
+    for d in $listDir; do
+        if [[ -d $d ]]; then
+            for fic in $d/**/*(.); do
+                execIfChanged $fic
+            done
+        else
+            execIfChanged $d
+        fi
+    done
+    ((ONCE == 1)) && break
+    touch $checkfile
+    sleep 2
+done