Closes #646 - adds open revision from branch command

package.json

@@ -2114,6 +2114,11 @@
                 "category": "GitLens"
             },
             {
+                "command": "gitlens.openFileRevisionFromBranch",
+                "title": "Open Revision from Branch or Tag...",
+                "category": "GitLens"
+            },
+            {
                 "command": "gitlens.openRepoInRemote",
                 "title": "Open Repository on Remote",
                 "category": "GitLens",
@@ -3037,6 +3042,10 @@
                     "when": "gitlens:activeFileStatus =~ /tracked/"
                 },
                 {
+                    "command": "gitlens.openFileRevisionFromBranch",
+                    "when": "gitlens:activeFileStatus =~ /tracked/"
+                },
+                {
                     "command": "gitlens.openRepoInRemote",
                     "when": "gitlens:hasRemotes"
                 },

src/commands.ts

@@ -23,6 +23,7 @@ export * from './commands/openChangedFiles';
 export * from './commands/openCommitInRemote';
 export * from './commands/openFileInRemote';
 export * from './commands/openFileRevision';
+export * from './commands/openFileRevisionFromBranch';
 export * from './commands/openInRemote';
 export * from './commands/openRepoInRemote';
 export * from './commands/openWorkingFile';

src/commands/common.ts

@@ -51,6 +51,7 @@ export enum Commands {
     OpenCommitInRemote = 'gitlens.openCommitInRemote',
     OpenFileInRemote = 'gitlens.openFileInRemote',
     OpenFileRevision = 'gitlens.openFileRevision',
+    OpenFileRevisionFromBranch = 'gitlens.openFileRevisionFromBranch',
     OpenInRemote = 'gitlens.openInRemote',
     OpenRepoInRemote = 'gitlens.openRepoInRemote',
     OpenWorkingFile = 'gitlens.openWorkingFile',

src/commands/openFileRevision.ts

@@ -51,7 +51,7 @@ export class OpenFileRevisionCommand extends ActiveEditorCommand {
         super(Commands.OpenFileRevision);
     }
 
-    async execute(editor: TextEditor, uri?: Uri, args: OpenFileRevisionCommandArgs = {}) {
+    async execute(editor: TextEditor | undefined, uri?: Uri, args: OpenFileRevisionCommandArgs = {}) {
         args = { ...args };
         if (args.line === undefined) {
             args.line = editor == null ? 0 : editor.selection.active.line;

src/commands/openFileRevisionFromBranch.ts

@@ -0,0 +1,58 @@
+'use strict';
+import { Range, TextDocumentShowOptions, TextEditor, Uri } from 'vscode';
+import { GlyphChars } from '../constants';
+import { GitBranch, GitTag, GitUri } from '../git/gitService';
+import { BranchesAndTagsQuickPick, BranchQuickPickItem, TagQuickPickItem } from '../quickpicks';
+import { Strings } from '../system';
+import { ActiveEditorCommand, command, Commands, getCommandUri, openEditor } from './common';
+
+export interface OpenFileRevisionFromBranchCommandArgs {
+    branchOrTag?: GitBranch | GitTag;
+
+    line?: number;
+    showOptions?: TextDocumentShowOptions;
+}
+
+@command()
+export class OpenFileRevisionFromBranchCommand extends ActiveEditorCommand {
+    constructor() {
+        super(Commands.OpenFileRevisionFromBranch);
+    }
+
+    async execute(editor: TextEditor | undefined, uri?: Uri, args: OpenFileRevisionFromBranchCommandArgs = {}) {
+        uri = getCommandUri(uri, editor);
+        if (uri == null) return undefined;
+
+        const gitUri = await GitUri.fromUri(uri);
+        if (!gitUri.repoPath) return undefined;
+
+        if (args.branchOrTag === undefined) {
+            const placeHolder = `Open revision of ${gitUri.getFormattedPath()}${
+                gitUri.sha ? ` ${Strings.pad(GlyphChars.Dot, 1, 1)} ${gitUri.shortSha}` : ''
+            } from Branch or Tag${GlyphChars.Ellipsis}`;
+
+            const pick = await new BranchesAndTagsQuickPick(gitUri.repoPath).show(placeHolder, {
+                allowCommitId: false
+            });
+            if (pick === undefined) return undefined;
+
+            if (!(pick instanceof BranchQuickPickItem) && !(pick instanceof TagQuickPickItem)) {
+                return undefined;
+            }
+
+            args.branchOrTag = pick.item;
+        }
+
+        if (args.line !== undefined && args.line !== 0) {
+            if (args.showOptions === undefined) {
+                args.showOptions = {};
+            }
+            args.showOptions.selection = new Range(args.line, 0, args.line, 0);
+        }
+
+        return openEditor(GitUri.toRevisionUri(args.branchOrTag.ref, gitUri.fsPath, gitUri.repoPath), {
+            ...args.showOptions,
+            rethrow: true
+        });
+    }
+}

src/quickpicks/branchesAndTagsQuickPick.ts

@@ -115,7 +115,7 @@ export interface BranchesAndTagsQuickPickOptions {
 
 export class BranchesAndTagsQuickPick {
     constructor(
-        public readonly repoPath: string
+        public readonly repoPath: string | undefined
     ) {}
 
     async show(
@@ -177,7 +177,10 @@ export class BranchesAndTagsQuickPick {
                             quickpick.busy = true;
                             quickpick.enabled = false;
 
-                            if (await Container.git.validateReference(this.repoPath, ref)) {
+                            if (
+                                this.repoPath === undefined ||
+                                (await Container.git.validateReference(this.repoPath, ref))
+                            ) {
                                 resolve(new RefQuickPickItem(ref));
                             }
                             else {