Adds shortenSha method

src/git/git.ts

@@ -99,7 +99,7 @@ export class Git {
     static async getVersionedFile(repoPath: string | undefined, fileName: string, branchOrSha: string) {
         const data = await Git.show(repoPath, fileName, branchOrSha, 'binary');
 
-        const suffix = Git.isSha(branchOrSha) ? branchOrSha.substring(0, 8) : branchOrSha;
+        const suffix = Git.isSha(branchOrSha) ? Git.shortenSha(branchOrSha) : branchOrSha;
         const ext = path.extname(fileName);
         return new Promise<string>((resolve, reject) => {
             tmp.file({ prefix: `${path.basename(fileName, ext)}-${suffix}__`, postfix: ext },
@@ -134,6 +134,10 @@ export class Git {
         return fileName && fileName.replace(/\\/g, '/');
     }
 
+    static shortenSha(sha: string) {
+        return sha.substring(0, 8);
+    }
+
     static splitPath(fileName: string, repoPath: string | undefined, extract: boolean = true): [string, string] {
         if (repoPath) {
             fileName = this.normalizePath(fileName);

src/git/gitUri.ts

@@ -56,7 +56,7 @@ export class GitUri extends Uri {
     }
 
     get shortSha() {
-        return this.sha && this.sha.substring(0, 8);
+        return this.sha && GitService.shortenSha(this.sha);
     }
 
     fileUri() {

src/git/models/commit.ts

@@ -51,7 +51,7 @@ export class GitCommit {
     }
 
     get shortSha() {
-        return this.sha.substring(0, 8);
+        return Git.shortenSha(this.sha);
     }
 
     get isUncommitted(): boolean {
@@ -62,7 +62,7 @@ export class GitCommit {
     }
 
     get previousShortSha() {
-        return this.previousSha && this.previousSha.substring(0, 8);
+        return this.previousSha && Git.shortenSha(this.previousSha);
     }
 
     get previousUri(): Uri {

src/git/models/logCommit.ts

@@ -1,6 +1,7 @@
 'use strict';
 import { Uri } from 'vscode';
 import { GitCommit, GitCommitType } from './commit';
+import { Git } from '../git';
 import { GitStatusFileStatus, IGitStatusFile } from './status';
 import * as path from 'path';
 
@@ -49,7 +50,7 @@ export class GitLogCommit extends GitCommit {
     }
 
     get nextShortSha() {
-        return this.nextSha && this.nextSha.substring(0, 8);
+        return this.nextSha && Git.shortenSha(this.nextSha);
     }
 
     get nextUri(): Uri {