dap-python, Flask support

dap-python.el

@@ -225,10 +225,22 @@ strings, for the sake of launch.json feature parity."
        ;; them to unspecified instead. Some templates in this file set such
        ;; properties (e.g. :module) to nil instead of leaving them undefined. To
        ;; support them, sanitize CONF before passing it on.
-       (when program
-         (if module
-             (push program python-args)
-           (plist-put conf :program program)))
+       (if (string-equal module "flask")
+           ;; For flask module we need to strip filename from launch parameters
+           ;; parameters are mostly ("<pathToFile/file.py", "parameters")
+           ;; but when you launch flask, you should only launch run in the directory
+           ;; with flask app
+           ;; So in the next code we search for run in the array and everything before
+           ;; will be deleted. Else run original code
+           (catch 'found
+             (dolist (p python-args)
+               (when (equal p "run")
+                 (throw 'found p))
+               (cdr python-args)))
+           (when program
+             (if module
+                 (push program python-args)
+                 (plist-put conf :program program))))
 
        (cl-remf conf :args)
        (plist-put conf :args (or python-args []))

docs/page/configuration.md

@@ -163,6 +163,33 @@ settings.
             :request "launch"
             :name "My App"))
     ```
+    2.1 Flask app
+
+    Default template from vscode can be used to launch flask app. Please create file **launch.json** in **.vscode** subfolder of project's root folder. And the contents can look like this example.
+    ```
+    {
+      "version": "0.2.0",
+      "configurations": [
+        {
+          "name": "<ProjectName>",
+          "type": "python",
+          "request": "launch",
+          "module": "flask",
+          "env": {
+            "FLASK_APP": "<location of app.py file>",
+            "FLASK_DEBUG": "1"
+          },
+          "args": [
+            "run",
+            "--no-debugger",
+            "--no-reload"
+          ],
+          "jinja": true,
+          "justMyCode": true
+        }
+      ]
+    }
+    ```
 
 3. Template parameters