Initial commit -- very basic blame support

src/git.ts

@@ -0,0 +1,68 @@
+'use strict';
+import {spawn} from 'child_process';
+import {dirname} from 'path';
+
+export declare interface IBlameLine {
+    line: number;
+    author: string;
+    date: Date;
+    sha: string;
+    //code: string;
+}
+
+export function gitRepoPath(cwd)  {
+    const mapper = (input, output) => {
+        output.push(input.toString().replace(/\r?\n|\r/g, ''))
+    };
+
+    return new Promise<string>((resolve, reject) => {
+        gitCommand(cwd, mapper, 'rev-parse', '--show-toplevel')
+            .then(result => resolve(result[0]))
+            .catch(reason => reject(reason));
+    });
+}
+
+const blameMatcher = /^(.*)\t\((.*)\t(.*)\t(.*?)\)(.*)$/gm;
+
+export function gitBlame(fileName: string) {
+    const mapper = (input, output) => {
+        let m: Array<string>;
+        while ((m = blameMatcher.exec(input.toString())) != null) {
+            output.push({
+                line: parseInt(m[4], 10),
+                author: m[2],
+                date: new Date(m[3]),
+                sha: m[1]
+                //code: m[5]
+            });
+        }
+    };
+
+    return gitCommand(dirname(fileName), mapper, 'blame', '-c', '-M', '-w', '--', fileName) as Promise<IBlameLine[]>;
+}
+
+function gitCommand(cwd: string, map: (input: Buffer, output: Array<any>) => void, ...args): Promise<any> {
+    return new Promise<any>((resolve, reject) => {
+        let spawn = require('child_process').spawn;
+        let process = spawn('git', args, { cwd: cwd });
+
+        let output: Array<any> = [];
+        process.stdout.on('data', data => {
+            map(data, output);
+        });
+
+        let errors: Array<string> = [];
+        process.stderr.on('data', err => {
+            errors.push(err.toString());
+        });
+
+        process.on('close', (exitCode, exitSignal) => {
+            if (exitCode && errors.length) {
+                reject(errors.toString());
+                return;
+            }
+
+            resolve(output);
+        });
+    });
+}