Fixed #8; Finally you can change the base density!

Change Base Density.sketchplugin

@@ -0,0 +1,29 @@
+// Developer: Geert Wille
+
+@import 'library/main.js'
+
+var selection = context.selection,
+    document = context.document,
+    factors = [
+        {
+            folder: '',
+            scale: 1.0,
+            suffix: '',
+        },
+        {
+            folder: '',
+            scale: 2.0,
+            suffix: '@2x',
+        },
+        {
+            folder: '',
+            scale: 3.0,
+            suffix: '@3x',
+        },
+    ]
+;
+
+var home_folder = "/Users/" + NSUserName();
+new AppSandbox().authorize(home_folder, function() {
+    com.geertwille.main.updateBaseDensity();
+});

Create Xcode Assets Catalog.sketchplugin

@@ -2,29 +2,32 @@
 //
 // Developer: Geert Wille
 
-#import 'library/main.js'
+@import 'library/main.js'
 
-var factors = [
-    {
-        folder: '',
-        scale: 1.0,
-        suffix: '',
-    },
-    {
-        folder: '',
-        scale: 2.0,
-        suffix: '@2x',
-    },
-    {
-        folder: '',
-        scale: 3.0,
-        suffix: '@3x',
-    },
-];
+var selection = context.selection,
+    document = context.document,
+    factors = [
+        {
+            folder: '',
+            scale: 1.0,
+            suffix: '',
+        },
+        {
+            folder: '',
+            scale: 2.0,
+            suffix: '@2x',
+        },
+        {
+            folder: '',
+            scale: 3.0,
+            suffix: '@3x',
+        },
+    ]
+;
 
 var home_folder = "/Users/" + NSUserName();
 new AppSandbox().authorize(home_folder, function() {
-    // do whatever you need to do here
-    com.geertwille.main.export('ios', factors);
+    var config = com.geertwille.main.readConfig();
+    com.geertwille.main.export('ios', factors, config['density-scale']);
 });
 

README.md

@@ -35,7 +35,9 @@ directory, you'll find the plugin functions under the Plugins menu in Sketch.
 
 ## Assumptions
 
-The plugin assumes you design your layouts in mdpi, which means 1px = 1dp
+~~The plugin assumes you design your layouts in mdpi, which means 1px = 1dp~~
+
+From now on this is configurable!
 
 ## Shortcuts
 

config.json

@@ -0,0 +1 @@
+{"density-scale":3}

library/functions.js

@@ -0,0 +1,73 @@
+var writeTextToFile = function(text, filePath) {
+    var t = [NSString stringWithFormat:@"%@", text],
+    f = [NSString stringWithFormat:@"%@", filePath];
+    return [t writeToFile:f atomically:true encoding:NSUTF8StringEncoding error:nil];
+}
+
+var readTextFromFile = function(filePath) {
+    var fileManager = [NSFileManager defaultManager];
+    if([fileManager fileExistsAtPath:filePath]) {
+        return [NSString stringWithContentsOfFile:filePath encoding:NSUTF8StringEncoding error:nil];
+    }
+    return nil;
+}
+
+var jsonFromFile = function(filePath, mutable) {
+    var data = [NSData dataWithContentsOfFile:filePath];
+    var options = mutable == true ? NSJSONReadingMutableContainers : 0
+    return [NSJSONSerialization JSONObjectWithData:data options:options error:nil];
+}
+
+var saveJsonToFile = function(jsonObj, filePath) {
+    writeTextToFile(stringify(jsonObj), filePath);
+}
+
+var stringify = function(obj, prettyPrinted) {
+    var prettySetting = prettyPrinted ? NSJSONWritingPrettyPrinted : 0,
+    jsonData = [NSJSONSerialization dataWithJSONObject:obj options:prettySetting error:nil];
+    return [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
+}
+
+var createTempFolderNamed = function(name) {
+    var tempPath = getTempFolderPath(name);
+    createFolderAtPath(tempPath);
+    return tempPath;
+}
+
+var getTempFolderPath = function(withName) {
+    var fileManager = [NSFileManager defaultManager],
+    cachesURL = [[fileManager URLsForDirectory:NSCachesDirectory inDomains:NSUserDomainMask] lastObject],
+    withName = (typeof withName !== 'undefined') ? withName : (Date.now() / 1000),
+    folderName = [NSString stringWithFormat:"%@", withName];
+    return [[cachesURL URLByAppendingPathComponent:folderName] path];
+}
+
+var createFolderAtPath = function(pathString) {
+    var fileManager = [NSFileManager defaultManager];
+    if([fileManager fileExistsAtPath:pathString]) return true;
+    return [fileManager createDirectoryAtPath:pathString withIntermediateDirectories:true attributes:nil error:nil];
+}
+
+var removeFileOrFolder = function(filePath) {
+    [[NSFileManager defaultManager] removeItemAtPath:filePath error:nil];
+}
+
+var readPluginPath = function() {
+    var pluginFolder = context.scriptPath.match(/Plugins\/([\w -])*/)[0] + "/";
+    var sketchPluginsPath = context.scriptPath.replace(/Plugins([\w \/ -])*.sketchplugin$/, "");
+
+    return {
+        sketchPluginsPath: sketchPluginsPath,
+        pluginFolder: pluginFolder
+    }
+}
+
+var helpers = {
+    readTextFromFile: readTextFromFile,
+    writeTextToFile: writeTextToFile,
+    jsonFromFile: jsonFromFile,
+    saveJsonToFile: saveJsonToFile,
+    createFolderAtPath: createFolderAtPath,
+    removeFileOrFolder: removeFileOrFolder,
+    readPluginPath: readPluginPath
+}

library/main.js

@@ -1,17 +1,20 @@
-#import 'library/general.js'
-#import 'library/messages.js'
-#import 'library/sandbox.js'
+@import 'library/general.js'
+@import 'library/functions.js'
+@import 'library/messages.js'
+@import 'library/sandbox.js'
 
 com.geertwille.main = {
     defaultAssetFolder: 'Images.xcassets',
     type: '',
+    baseDensity: 0,
     baseDir: '',
     factors: {},
     layerVisibility: [],
 
-    export: function(type, factors) {
+    export: function(type, factors, baseDensity) {
         this.type = type;
         this.factors = factors;
+        this.baseDensity = baseDensity;
         this.baseDir = this.getDirFromPrompt();
 
         if (this.baseDir == null) {
@@ -25,6 +28,10 @@ com.geertwille.main = {
             return;
         }
 
+        if (this.baseDensity == 0) {
+            this.baseDensity = this.getDensityScaleFromPrompt();
+        }
+
         // Hide all layers except the ones we are slicing
         for (var i = 0; i < [selection count]; i++) {
             var layer = [selection objectAtIndex:i];
@@ -70,6 +77,28 @@ com.geertwille.main = {
         }
     },
 
+    //Let the user select design density
+    getDensityScaleFromPrompt: function() {
+        var folders       = helpers.readPluginPath(),
+            accessory     = [[NSComboBox alloc] initWithFrame:NSMakeRect(0, 0, 200, 25)],
+            alert         = [[NSAlert alloc] init],
+            responseCode
+        ;
+        [accessory addItemsWithObjectValues:['@1x', '@2x', '@3x']];
+        [accessory selectItemAtIndex: 0];
+
+        [alert setMessageText:'Select screen density'];
+        [alert addButtonWithTitle:'OK'];
+        [alert setAccessoryView:accessory];
+
+        responseCode = [alert runModal];
+        var densityScale = [accessory indexOfSelectedItem] + 1;
+
+        helpers.saveJsonToFile([NSDictionary dictionaryWithObjectsAndKeys:densityScale, @"density-scale", nil], folders.sketchPluginsPath + folders.pluginFolder + '/config.json');
+
+        return densityScale;
+    },
+
     processSlice: function(slice) {
         var frame        = [slice frame],
             sliceName    = [slice name],
@@ -121,7 +150,7 @@ com.geertwille.main = {
         }
 
         // write the json string to a file
-        var ok = this.writeTextToFile(this.prepareJSON(lineBuffer), this.baseDir + "/" + this.defaultAssetFolder + "/" + cutSliceName + ".imageset/Contents.json");
+        var ok = helpers.writeTextToFile(this.prepareJSON(lineBuffer), this.baseDir + "/" + this.defaultAssetFolder + "/" + cutSliceName + ".imageset/Contents.json");
 
         if (ok === false) {
             com.geertwille.general.alert(com.geertwille.messages.unknown_error);
@@ -144,34 +173,14 @@ com.geertwille.main = {
             }
         }
 
-        slice = [MSExportRequest requestWithRect:rect scale:factor];
+        slice = [MSExportRequest requestWithRect:rect scale:(factor / this.baseDensity)];
         slice.shouldTrim = true;
         // slice.saveForWeb = true;
         // slice.compression = 0;
         slice.includeArtboardBackground = false;
         return slice;
     },
 
-    writeTextToFile: function(text, path) {
-        var result = false;
-        if (typeof path !== 'string')
-            return result;
-
-        // create a NSString object from the given text
-        var nsstring = NSString.stringWithUTF8String(text);
-
-        // use the writeToFile method of the NSString object to write the text to the given URL
-        result = [nsstring writeToFile:path atomically:1 encoding:NSUTF8StringEncoding error:null];
-
-        if (!result) {
-            result = false;
-        } else {
-            result = true;
-        }
-
-        return result;
-    },
-
     prepareJSON: function(lineBuffer) {
         var jsoncode = '{ "images" : [';
 
@@ -183,5 +192,16 @@ com.geertwille.main = {
         jsoncode = jsoncode + ' ], "info" : { "version" : 1, "author" : "xcode" }}';
 
         return jsoncode;
+    },
+
+    readConfig: function() {
+        var folders = helpers.readPluginPath();
+        log(folders.sketchPluginsPath + folders.pluginFolder);
+        return helpers.jsonFromFile(folders.sketchPluginsPath + folders.pluginFolder + '/config.json', true);
+        // helpers.jsonFromFile();
+    },
+
+    updateBaseDensity: function() {
+        this.getDensityScaleFromPrompt();
     }
 }