angular-cn/tools/broccoli/tree-differ.ts

117 lines
3.3 KiB
TypeScript

/// <reference path="../typings/node/node.d.ts" />
import fs = require('fs');
import path = require('path');
export class TreeDiffer {
private fingerprints: {[key: string]: string} = Object.create(null);
private nextFingerprints: {[key: string]: string} = Object.create(null);
private rootDirName: string;
constructor(private rootPath: string) { this.rootDirName = path.basename(rootPath); }
public diffTree(): DiffResult {
let result = new DirtyCheckingDiffResult(this.rootDirName);
this.dirtyCheckPath(this.rootPath, result);
this.detectDeletionsAndUpdateFingerprints(result);
result.endTime = Date.now();
return result;
}
private dirtyCheckPath(rootDir: string, result: DirtyCheckingDiffResult) {
fs.readdirSync(rootDir).forEach((segment) => {
let absolutePath = path.join(rootDir, segment);
let pathStat = fs.statSync(absolutePath);
if (pathStat.isDirectory()) {
result.directoriesChecked++;
this.dirtyCheckPath(absolutePath, result);
} else {
result.filesChecked++;
if (this.isFileDirty(absolutePath, pathStat)) {
result.changedPaths.push(path.relative(this.rootPath, absolutePath));
}
}
});
return result;
}
private isFileDirty(path: string, stat: fs.Stats): boolean {
let oldFingerprint = this.fingerprints[path];
let newFingerprint = `${stat.mtime.getTime()} # ${stat.size}`;
this.nextFingerprints[path] = newFingerprint;
if (oldFingerprint) {
this.fingerprints[path] = null;
if (oldFingerprint === newFingerprint) {
// nothing changed
return false;
}
}
return true;
}
private detectDeletionsAndUpdateFingerprints(result: DiffResult) {
for (let absolutePath in this.fingerprints) {
if (this.fingerprints[absolutePath] !== null) {
let relativePath = path.relative(this.rootPath, absolutePath);
result.removedPaths.push(relativePath);
}
}
this.fingerprints = this.nextFingerprints;
this.nextFingerprints = Object.create(null);
}
}
export interface DiffResult {
changedPaths: string[];
removedPaths: string[];
log(verbose: boolean): void;
toString(): string;
}
class DirtyCheckingDiffResult {
public filesChecked: number = 0;
public directoriesChecked: number = 0;
public changedPaths: string[] = [];
public removedPaths: string[] = [];
public startTime: number = Date.now();
public endTime: number = null;
constructor(public name: string) {}
toString() {
return `${pad(this.name, 40)}, ` +
`duration: ${pad(this.endTime - this.startTime, 5)}ms, ` +
`${pad(this.changedPaths.length + this.removedPaths.length, 5)} changes detected ` +
`(files: ${pad(this.filesChecked, 5)}, directories: ${pad(this.directoriesChecked, 4)})`;
}
log(verbose) {
let prefixedPaths =
this.changedPaths.map((p) => `* ${p}`).concat(this.removedPaths.map((p) => `- ${p}`));
console.log(`Tree diff: ${this}` +
((verbose && prefixedPaths.length) ? ` [\n ${prefixedPaths.join('\n ')}\n]` : ''));
}
}
function pad(value, length) {
value = '' + value;
let whitespaceLength = (value.length < length) ? length - value.length : 0;
whitespaceLength = whitespaceLength + 1;
return new Array(whitespaceLength).join(' ') + value;
}