identify custom format added

lib/getters.js

@@ -95,6 +95,10 @@ module.exports = function (gm) {
    */
 
   proto.identify = function identify (opts, callback) {
+    // identify with pattern
+    if (typeof(opts) === 'string') {
+      return identifyPattern.apply(this, arguments);
+    }
     if (!callback) callback = opts, opts = {};
     if (!callback) return this;
 
@@ -139,6 +143,34 @@ module.exports = function (gm) {
     return self;
   }
 
+
+  /**
+   * identify with pattern
+   *
+   * Execute `identify -format` with custom pattern
+   */
+
+  function identifyPattern (pattern, opts, callback) {
+    if (!callback) callback = opts, opts = {};
+    if (!callback) return this;
+
+    var self = this;
+
+    self.bufferStream = !!opts.bufferStream;
+
+    var args = makeArgs(self, { format: pattern });
+    self._exec(args, function (err, stdout, stderr, cmd) {
+      if (err) {
+        return callback.call(self, err, undefined, stdout, stderr, cmd);
+      }
+
+      callback.call(self, err, (stdout||'').trim());
+    });
+
+    return self;
+  }
+
+
   /**
    * Parses `identify` responses.
    *

test/autoOrientAndThumb.js

@@ -31,7 +31,7 @@ module.exports = function (_, dir, finish, gm) {
 
 
   function size (file, cb) {
-    gm(file).identify(result, function (err, data) {
+    gm(file).identify(function (err, data) {
       if (err) return cb(err);
       cb(err, data.size);
     });

test/getterIdentify.js

@@ -59,10 +59,12 @@ module.exports = function (_, dir, finish, gm) {
       assert.equal(d['Geometry'], '430x488');
     }
 
-    gif();
+    gif(function () {
+      pattern();
+    });
   });
 
-  function gif () {
+  function gif (callback) {
     var test = gm(dir + '/blue.gif');
     if (im) test.options({ imageMagick: true });
     test.identify(function (err) {
@@ -95,6 +97,19 @@ module.exports = function (_, dir, finish, gm) {
         assert.ok(blackWorks);
       }
 
+      callback();
+    });
+  }
+
+  function pattern () {
+    var test = gm(dir + '/blue.gif');
+
+    if (im) test.options({ imageMagick: true });
+    test.identify('%f: %m, %wx%h', function (err, result) {
+      if (err) return finish(err);
+
+      assert.equal(result, 'blue.gif: GIF, 100x200');
+
       finish();
     });
   }

test/resizeAndAutoOrientFromBuffer.js

@@ -43,7 +43,7 @@ module.exports = function (_, dir, finish, gm) {
 
 
   function size (file, cb) {
-    gm(file).identify(result, function (err, data) {
+    gm(file).identify(function (err, data) {
       if (err) return cb(err);
       cb(err, data.size);
     });

test/resizeBuffer.js

@@ -42,7 +42,7 @@ module.exports = function (_, dir, finish, gm) {
 
 
   function size (file, cb) {
-    gm(file).identify(result, function (err, data) {
+    gm(file).identify(function (err, data) {
       if (err) return cb(err);
       cb(err, data.size);
     });