Added Taskwarrior import/export script.

taskwarrior/info.json

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+{
+  "name": "Taskwarrior import/export",
+  "identifier": "taskwarrior",
+  "script": "taskwarrior.qml",
+  "version": "0.0.1",
+  "minAppVersion": "17.06.1",
+  "authors": ["@fmakowski"],
+  "description" : "This script creates menu items and buttons to import and export Taskwarrior tasks."
+}

taskwarrior/taskwarrior.qml

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+import QtQml 2.0
+import QOwnNotesTypes 1.0
+
+/**
+ * This script is used for manual interaction with Taskwarrior by either
+ * importing tasks from a certain project, or exporting them from a note.
+ */
+QtObject {
+    /**
+     * Initializes the custom actions
+     */
+    function init() {
+        // export selected data to Taskwarrior 
+        script.registerCustomAction("exportToTaskwarrior", "Export selected list as Taskwarrior tasks", "Export to Taskwarrior");
+
+        // create a menu entry "Create meeting note" with a button and a freedesktop theme icon
+        // script.registerCustomAction("importFromTaskwarrior", "Import tasks from Taskwarrior as a list", "Import from Taskwarrior");
+    }
+
+    /**
+     * This function is invoked when a custom action is triggered
+     * in the menu or via button
+     * 
+     * @param identifier string the identifier defined in registerCustomAction
+     */
+    function customActionInvoked(identifier) {
+
+        switch (identifier) {
+            // export selected lines to Taskwarriors as tasks.
+            // The project name will be taken from "Project:" keyword detected in first lines.
+            case "exportToTaskwarrior":
+                // Get selected text and separate it by lines.
+                
+                var text = script.noteTextEditSelectedText();
+                var separatedByLines;
+                // Consider Windows different newline method.
+                if (script.platformIsWindows()) {
+                    separatedByLines = text.split('\r\n');
+                } else {
+                    separatedByLines = text.split('\n');
+                }
+                
+                // Starting with an empty default project name.
+                var projectName;
+                
+                // For each line, we are gathering data to properly create tasks.
+                separatedByLines.forEach(function (line){
+                    // We are trying to get the name of the project. 
+                    // To do so, we are getting the substring of a line by using regexp group.
+                    var projectRegExp = /project:[\s*]?(.+)?[\s*]?/i;
+                    var isProjectNameLine = projectRegExp.exec(line);
+                    if (isProjectNameLine) {
+                        projectName = isProjectNameLine[1];
+                        // We expect, that the project name would be the only thing in line, hence `return`.
+                        return;
+                    }
+                    
+                    // We are trying to get the task description.
+                    // It should be started with either - (minus) or * (asterisk) to indicate list item.
+                    var taskRegExp = /[\*\-][\s*]?(.+)[\s*]?/; 
+                    var taskDescription;
+                    
+                    var isTask = taskRegExp.exec(line);
+                    if (isTask) {
+                        taskDescription = isTask[1];
+                        script.log(taskDescription);
+                        script.startDetachedProcess("/usr/bin/task",
+                                                    [
+                                                        "add",
+                                                        "pro:" + projectName,
+                                                        taskDescription
+                                                    ]);
+                        // We expect, that the task description would be the only thing in the line, hence `return`.
+                        return;
+                    }
+                });
+        }
+    }
+}