feat(tasks): adds edit task

src/tasks/create/edit.ts

@@ -0,0 +1,49 @@
+import { Task, Context } from '../../definitions';
+import { getPaths, useSource } from '../../helpers/paths';
+import { isCancelled } from '../../utils';
+import { log } from './log';
+import { Serial } from 'type-core';
+import { into } from 'pipettes';
+import fs from 'fs-extra';
+
+export interface EditOptions {
+  glob?: boolean;
+  strict?: boolean;
+}
+
+export function edit(
+  paths: string | string[],
+  cb: (
+    buffer: Buffer,
+    path: string
+  ) => Buffer | Serial.Type | Promise<Buffer | Serial.Type>,
+  options?: EditOptions
+): Task.Async {
+  return async (ctx: Context): Promise<void> => {
+    into(ctx, log('debug', 'Edit:', paths));
+
+    const opts = Object.assign({ glob: false, strict: false }, options);
+    const sources = await getPaths(paths, ctx, {
+      glob: opts.glob,
+      strict: opts.strict
+    });
+
+    for (const source of sources) {
+      if (await isCancelled(ctx)) return;
+
+      await useSource(source, ctx, { strict: opts.strict }, async () => {
+        const buffer = await fs.readFile(source);
+        const content = await cb(buffer, source);
+
+        if (await isCancelled(ctx)) return;
+
+        const data = Buffer.isBuffer(content)
+          ? content
+          : typeof content === 'object'
+          ? JSON.stringify(content, null, 2)
+          : String(content);
+        await fs.writeFile(source, data);
+      });
+    }
+  };
+}

src/tasks/create/index.ts

@@ -1,5 +1,6 @@
 export * from './clear';
 export * from './copy';
+export * from './edit';
 export * from './exec';
 export * from './log';
 export * from './mkdir';