After the recent rise of task-management related tools like Grunt, Gulp, and Broccoli, I’ve often wonered if there was an easier way to implement some of the most useful features that those tools provide:
watch (of course, watch is not the only thing that these libraries provide, but is often the most unique/useful).
Grunt, Gulp and Broccoli are wonderful tools, and these days basically come hand-in-hand with front-end development, however there are various downsides to installing/using them. To name a few:
kqueueand some use
inotify, but what I wanted to find was a program that sat above those levels of abstraction. Enter
Entr is wonderfully simple — you feed it a list of files, and a command, and it will watch the noted files for changes, and run which ever command you specify. Written in C, the project is very small, and compilation/installation is a breeze, with absurdly small configure/make time.
I decided to use
make for a FirefoxOS app project that I’m working on (an odd choice for a front-end app, maybe), and wanted to find a way to get this watch functionality without adding too many new dependencies to my app. I happened upon Entr a while ago and it came to mind, and I downloaded, used, and was instantly pleased with it.
I had the most trouble with getting the
find command to return the files that I wanted, without the files I didn’t. My make file now has the following lines:
watch: find . \ -not -path "./node\_modules/\*" \ -not -path "./jspm\_packages/\*" \ -type f \ -name "\*.js" \ -o -name "\*.css" \ | entr make
watch target is basically just a find command to get the files that are important (that I want watched), and piping the output of that find command to entr, and running make (for which the default is to build the project).
I’d theorized using entr for a project, instead of gulp/grunt/broccoli, and having actually done it just recently, it turned out to be pretty easy, and is working great!