feat: Enable visualisation of the Status settings

resources/sample_vaults/Tasks-Demo/.gitignore

@@ -0,0 +1 @@
+Tasks Plugin - Review and check your Statuses*

src/Config/SettingsTab.ts

@@ -4,6 +4,7 @@ import type TasksPlugin from '../main';
 import { StatusRegistry } from '../StatusRegistry';
 import { Status } from '../Status';
 import type { StatusCollection } from '../StatusCollection';
+import { createStatusRegistryReport } from '../StatusRegistryReport';
 import * as Themes from './Themes';
 import { type HeadingState, TASK_FORMATS } from './Settings';
 import { getSettings, isFeatureEnabled, updateGeneralSetting, updateSettings } from './Settings';
@@ -569,6 +570,36 @@ export class SettingsTab extends PluginSettingTab {
         });
         addAllUnknownStatuses.infoEl.remove();
 
+        /* -------------------- 'Review and check your Statuses' button -------------------- */
+        const createMermaidDiagram = new Setting(containerEl).addButton((button) => {
+            const buttonName = 'Review and check your Statuses';
+            button
+                .setButtonText(buttonName)
+                .setCta()
+                .onClick(async () => {
+                    // Generate a new file unique file name, in the root of the vault
+                    const now = window.moment();
+                    const formattedDateTime = now.format('YYYY-MM-DD HH-mm-ss');
+                    const filename = `Tasks Plugin - ${buttonName} ${formattedDateTime}.md`;
+
+                    // Create the report
+                    const version = this.plugin.manifest.version;
+                    const statusRegistry = StatusRegistry.getInstance();
+                    const fileContent = createStatusRegistryReport(statusRegistry, buttonName, version);
+
+                    // Save the file
+                    const file = await app.vault.create(filename, fileContent);
+
+                    // And open the new file
+                    const leaf = this.app.workspace.getLeaf(true);
+                    await leaf.openFile(file);
+                });
+            button.setTooltip(
+                'Create a new file in the root of the vault, containing a Mermaid diagram of the current status settings.',
+            );
+        });
+        createMermaidDiagram.infoEl.remove();
+
         /* -------------------- 'Reset Custom Status Types to Defaults' button -------------------- */
         const clearCustomStatuses = new Setting(containerEl).addButton((button) => {
             button

src/StatusRegistryReport.ts

@@ -0,0 +1,19 @@
+import type { StatusRegistry } from './StatusRegistry';
+
+export function createStatusRegistryReport(statusRegistry: StatusRegistry, buttonName: string, versionString: string) {
+    // Ideas for further improvement
+    // - Actually make it an informative report, that shows any issues in settings with duplicate symbols.
+    // - Show any 'next status symbols' that are not known to the plugin.
+    // - Show any status transitions that won't work with recurring tasks currently, as DONE not followed by TODO.
+
+    const detailed = true;
+    const mermaidText = statusRegistry.mermaidDiagram(detailed);
+    return `# ${buttonName}
+
+This file was created by the Obsidian Tasks plugin (version ${versionString}) to help visualise the task statuses in this vault.
+
+You can delete this file any time.
+
+<!-- Switch to Live Preview or Reading Mode to see the diagram. -->
+${mermaidText}`;
+}

tests/StatusRegistryReport.test.StatusRegistryReport_should_create_a_report.approved.md

@@ -0,0 +1,23 @@
+# Review and check your Statuses
+
+This file was created by the Obsidian Tasks plugin (version x.y.z) to help visualise the task statuses in this vault.
+
+You can delete this file any time.
+
+<!-- Switch to Live Preview or Reading Mode to see the diagram. -->
+
+```mermaid
+flowchart LR
+1["'Todo'<br>[ ] -> [x]<br>(TODO)"]
+2["'In Progress'<br>[/] -> [x]<br>(IN_PROGRESS)"]
+3["'Done'<br>[x] -> [ ]<br>(DONE)"]
+4["'Cancelled'<br>[-] -> [ ]<br>(CANCELLED)"]
+5["'Question'<br>[Q] -> [A]<br>(NON_TASK)"]
+6["'Answer'<br>[A] -> [Q]<br>(NON_TASK)"]
+1 --> 3
+2 --> 3
+3 --> 1
+4 --> 1
+5 --> 6
+6 --> 5
+```

tests/StatusRegistryReport.test.ts

@@ -0,0 +1,21 @@
+import { StatusRegistry } from '../src/StatusRegistry';
+import { StatusConfiguration, StatusType } from '../src/StatusConfiguration';
+import { createStatusRegistryReport } from '../src/StatusRegistryReport';
+import { verifyWithFileExtension } from './TestingTools/ApprovalTestHelpers';
+
+describe('StatusRegistryReport', function () {
+    it('should create a report', () => {
+        // Arrange
+        const statusRegistry = new StatusRegistry();
+        statusRegistry.add(new StatusConfiguration('Q', 'Question', 'A', false, StatusType.NON_TASK));
+        statusRegistry.add(new StatusConfiguration('A', 'Answer', 'Q', false, StatusType.NON_TASK));
+        const reportName = 'Review and check your Statuses';
+
+        // Act
+        const version = 'x.y.z'; // lower-case, as the capitalised version would get edited at the next release.
+        const report = createStatusRegistryReport(statusRegistry, reportName, version);
+
+        // Assert
+        verifyWithFileExtension(report, '.md');
+    });
+});