Adds diffWithRevision command

src/commands/diffWithRevision.ts

@@ -0,0 +1,81 @@
+'use strict';
+import { commands, TextDocumentShowOptions, TextEditor, Uri, window } from 'vscode';
+import { ActiveEditorCommand, CommandContext, Commands, getCommandUri } from './common';
+import { BuiltInCommands, GlyphChars } from '../constants';
+import { GitService, GitUri } from '../gitService';
+import { Logger } from '../logger';
+import { Messages } from '../messages';
+import { CommandQuickPickItem, FileHistoryQuickPick } from '../quickPicks';
+import * as path from 'path';
+
+export interface DiffWithRevisionCommandArgs {
+    line?: number;
+    maxCount?: number;
+    showOptions?: TextDocumentShowOptions;
+}
+
+export class DiffWithRevisionCommand extends ActiveEditorCommand {
+
+    constructor(private git: GitService) {
+        super(Commands.DiffWithRevision);
+    }
+
+    async run(context: CommandContext, args: DiffWithRevisionCommandArgs = {}): Promise<any> {
+        // Since we can change the args and they could be cached -- make a copy
+        switch (context.type) {
+            case 'uri':
+                return this.execute(context.editor, context.uri, { ...args });
+            case 'scm-states':
+                const resource = context.scmResourceStates[0];
+                return this.execute(undefined, resource.resourceUri, { ...args });
+            case 'scm-groups':
+                return undefined;
+            default:
+                return this.execute(context.editor, undefined, { ...args });
+        }
+    }
+
+    async execute(editor: TextEditor | undefined, uri?: Uri, args: DiffWithRevisionCommandArgs = {}): Promise<any> {
+        uri = getCommandUri(uri, editor);
+        if (uri === undefined) return undefined;
+
+        if (args.line === undefined) {
+            args.line = editor === undefined ? 0 : editor.selection.active.line;
+        }
+
+        const gitUri = await GitUri.fromUri(uri, this.git);
+        if (args.maxCount == null) {
+            args.maxCount = this.git.config.advanced.maxQuickHistory;
+        }
+
+        const progressCancellation = FileHistoryQuickPick.showProgress(gitUri);
+        try {
+            const log = await this.git.getLogForFile(gitUri.repoPath, gitUri.fsPath, gitUri.sha, { maxCount: args.maxCount });
+            if (log === undefined) return Messages.showFileNotUnderSourceControlWarningMessage('Unable to open history compare');
+
+            if (progressCancellation.token.isCancellationRequested) return undefined;
+
+            const pick = await FileHistoryQuickPick.show(this.git, log, gitUri, progressCancellation, { pickerOnly: true });
+            if (pick === undefined) return undefined;
+
+            if (pick instanceof CommandQuickPickItem) return pick.execute();
+
+            const compare = await this.git.getVersionedFile(gitUri.repoPath, gitUri.fsPath, pick.commit.sha);
+
+            await commands.executeCommand(BuiltInCommands.Diff,
+                Uri.file(compare),
+                gitUri.fileUri(),
+                `${path.basename(gitUri.fsPath)} (${pick.commit.shortSha}) ${GlyphChars.ArrowLeftRight} ${path.basename(gitUri.fsPath)}`,
+                args.showOptions);
+
+            if (args.line === undefined || args.line === 0) return undefined;
+
+            // TODO: Figure out how to focus the left pane
+            return await commands.executeCommand(BuiltInCommands.RevealLine, { lineNumber: args.line, at: 'center' });
+        }
+        catch (ex) {
+            Logger.error(ex, 'DiffWithRevisionCommand', 'getVersionedFile');
+            return window.showErrorMessage(`Unable to open history compare. See output channel for more details`);
+        }
+    }
+}