.makeResizedImages(..) mostly works correctly, still missing transforms + UI...

Signed-off-by: Alex A. Naanou <alex.nanou@gmail.com>

Viewer/features/sharp.js

@@ -119,7 +119,9 @@ var SharpActions = actions.Actions({
 			this.previewConstructorWorker && this.previewConstructorWorker.kill()
 			delete this.previewConstructorWorker }],
 
-	// XXX should this resize up??? ...option???
+	// XXX Q: if skipSmaller and overwrite: 'backup' and image smaller (skiped) do we backup???
+	// 		...I think no...
+	// XXX make backup name pattern configurable...
 	// XXX add transform/crop support...
 	// XXX revise logging...
 	makeResizedImage: ['- Image/',
@@ -141,18 +143,28 @@ var SharpActions = actions.Actions({
 				// output image name...
 				//
 				// Used if processing a single image, ignored otherwise.
-				name: <str>,
+				name: null | <str>,
 
 				// image name pattern and data...
 				//
 				// NOTE: for more info on pattern see: .formatImageName(..)
-				pattern: <str>,
+				pattern: null | <str>,
-				data: { .. },
+				data: null | { .. },
+
+				// if true and image is smaller than size enlarge it...
+				// 
+				// default: null / false
+				enlarge: null | true,
 
 				// overwrite, backup or skip (default) existing images...
 				//
 				// default: null / false
-				overwrite: true | 'backup' | false,
+				overwrite: null | true | 'backup',
+
+				// if true do not write an image if it's smaller than size...
+				// 
+				// default: null / false
+				skipSmaller: null | true,
 
 				// XXX not implemented...
 				transform: ...,
@@ -162,6 +174,7 @@ var SharpActions = actions.Actions({
 ,			}
 
 
+		NOTE: all options are optional.
 		NOTE: this will not overwrite existing images.
 		`,
 		function(images, size, path, options={}){
@@ -200,8 +213,12 @@ var SharpActions = actions.Actions({
 				name, 
 				pattern, 
 				data, 
+
 				// file handling...
+				enlarge,
+				skipSmaller,
 				overwrite,
+
 				// transformations...
 				// XXX not implemented...
 				transform, 
@@ -238,16 +255,37 @@ var SharpActions = actions.Actions({
 
 					logger && logger.emit('queued', to)
 
-					// existing image...
+					var img = sharp(source)
+					return (skipSmaller ?
+							// skip source if smaller...
+							img
+								.metadata()
+								.then(function(m){
+									// skip...
+									if((fit == 'inside'
+												&& Math.max(m.width, m.height) < size)
+											|| (fit == 'outside'
+												&& Math.min(m.width, m.height) < size)){
+										logger && logger.emit('skipping', to)
+										return }
+									return img })
+							: Promise.resolve(img))
+						// write...
+						.then(function(img){
+							return img 
+								&& ensureDir(pathlib.dirname(to))
+									.then(function(){
+										// handle existing image...
 										if(fse.existsSync(to)){
 											// rename...
+											// XXX make backup name pattern configurable...
 											if(overwrite == 'backup'){
 												var i = 0
-							while(fse.existsSync(`${to}.${timestamp}'-bak`+ (i || ''))){
+												while(fse.existsSync(`${to}.${timestamp}.bak`+ (i || ''))){
 													i++ }
 												fse.renameSync(
 													to,
-								fse.existsSync(`${to}.${timestamp}'-bak`+ (i || '')))
+													`${to}.${timestamp}.bak`+ (i || ''))
 											// remove...
 											} else if(overwrite){
 												fse.removeSync(to)
@@ -256,9 +294,8 @@ var SharpActions = actions.Actions({
 												logger && logger.emit('skipping', to)
 												return } }
 
-					return ensureDir(pathlib.dirname(to))
+										// write...
-						.then(function(){
+										return img
-							return sharp(source)
 											.clone()
 											// handle transform (.orientation / .flip) and .crop...
 											.run(function(){
@@ -275,20 +312,23 @@ var SharpActions = actions.Actions({
 												// 		and in which coordinates we 
 												// 		crop (i.e. pre/post transform)...
 												if(transform){
+													// XXX
 												}
 												if(crop){
+													// XXX
 												}
 											})
 											.resize({
 												width: size,
 												height: size,
 												fit: fit,
+												withoutEnlargement: !enlarge,
 											})
 											.withMetadata()
 											.toFile(to) 
 											.then(function(){
 												logger 
-										&& logger.emit('done', to) })}) })) }],
+													&& logger.emit('done', to) }) }) }) })) }],
 										
 	// XXX use .makeResizedImage(..)
 	// XXX should this account for non-jpeg images???