Log filename with [update] or [ignore] flags during `--write` process. (#584)

* Make `--write` logs more informative.

* Add format duration to logs.

* Use colors instead of [ignore] and [update] labels.

* Remove `colors` dependency.

* Use `chalk` to colorize logs.

* Print filename before `format` and add duration info later.

* Print filename before read error.

bin/prettier.js

@@ -5,6 +5,7 @@
 const fs = require("fs");
 const getStdin = require("get-stdin");
 const glob = require("glob");
+const chalk = require("chalk");
 const minimist = require("minimist");
 const prettier = require("../index");
 
@@ -184,28 +185,46 @@ if (stdin) {
   eachFilename(filepatterns, filename => {
     fs.readFile(filename, "utf8", (err, input) => {
       if (write || argv["debug-check"]) {
-        console.log(filename);
+        // Don't use `console.log` here since we need to replace this line.
+        process.stdout.write(filename);
       }
 
       if (err) {
+        // Add newline to split errors from filename line.
+        process.stdout.write("\n");
+
         console.error("Unable to read file: " + filename + "\n" + err);
         // Don't exit the process if one file failed
         process.exitCode = 2;
         return;
       }
 
+      const start = Date.now();
+
       let output;
+
       try {
         output = format(input);
       } catch (e) {
+        // Add newline to split errors from filename line.
+        process.stdout.write("\n");
+
         handleError(filename, e);
         return;
       }
 
       if (write) {
+        // Remove previously printed filename to log it with duration.
+        process.stdout.clearLine();
+        process.stdout.cursorTo(0);
+
         // Don't write the file if it won't change in order not to invalidate
         // mtime based caches.
-        if (output !== input) {
+        if (output === input) {
+          console.log(chalk.grey("%s %dms"), filename, Date.now() - start);
+        } else {
+          console.log("%s %dms", filename, Date.now() - start);
+
           fs.writeFile(filename, output, "utf8", err => {
             if (err) {
               console.error("Unable to write file: " + filename + "\n" + err);

package.json

@@ -19,6 +19,7 @@
     "ast-types": "0.9.4",
     "babel-code-frame": "6.22.0",
     "babylon": "6.15.0",
+    "chalk": "1.1.3",
     "esutils": "2.0.2",
     "flow-parser": "0.38.0",
     "get-stdin": "5.0.1",

yarn.lock

@@ -562,7 +562,7 @@ center-align@^0.1.1:
     align-text "^0.1.3"
     lazy-cache "^1.0.3"
 
-chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
+chalk@1.1.3, chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
   version "1.1.3"
   resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
   dependencies: