Adds code actions to open diffs

Adds context menus for toggling blame
Adds context menus for opening diffs
More refactoring and many bug fixes

src/gitCodeActionProvider.ts

@@ -0,0 +1,39 @@
+'use strict';
+import {CancellationToken, CodeActionContext, CodeActionProvider, Command, DocumentSelector, ExtensionContext, Range, TextDocument, Uri, window} from 'vscode';
+import {Commands, DocumentSchemes} from './constants';
+import GitProvider from './gitProvider';
+import {DiagnosticSource} from './constants';
+
+export default class GitCodeActionProvider implements CodeActionProvider {
+    static selector: DocumentSelector = { scheme: DocumentSchemes.File };
+
+    constructor(context: ExtensionContext, private git: GitProvider) { }
+
+    provideCodeActions(document: TextDocument, range: Range, context: CodeActionContext, token: CancellationToken): Command[] | Thenable<Command[]> {
+        if (!context.diagnostics.some(d => d.source !== DiagnosticSource)) {
+            return [];
+        }
+
+        return this.git.getBlameForLine(document.fileName, range.start.line)
+            .then(blame => {
+                const actions: Command[] = [];
+                if (blame.commit.sha) {
+                    actions.push({
+                        title: `GitLens: Diff ${blame.commit.sha} with working tree`,
+                        command: Commands.DiffWithWorking,
+                        arguments: [Uri.file(document.fileName), blame.commit.sha, range]
+                    });
+                }
+
+                if (blame.commit.sha && blame.commit.previousSha) {
+                    actions.push({
+                        title: `GitLens: Diff ${blame.commit.sha} with previous ${blame.commit.previousSha}`,
+                        command: Commands.DiffWithPrevious,
+                        arguments: [Uri.file(document.fileName), blame.commit.sha, blame.commit.previousSha, range]
+                    });
+                }
+
+                return actions;
+            });
+    }
+}