Add(concat): prefix and suffix options (fix #48)

hopp.lock

@@ -1 +1 @@
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packages/hopp-plugin-babel/.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "git.ignoreLimitWarning": true
+}

packages/hopp-plugin-concat/example/.gitignore

@@ -1,2 +1,3 @@
+.vscode
 hopp.lock
 dist

packages/hopp-plugin-concat/example/hoppfile.js

@@ -4,5 +4,7 @@ hopp.load(`${__dirname}/../`)
 
 exports.default =
   hopp('src/*.js')
-    .concat()
-    .dest('dist')
+    .concat({
+      prefix:"@Rock"
+    })
+    .dest('dist.lock')

packages/hopp-plugin-concat/example/src/tmp.js

@@ -0,0 +1 @@
+console.log("this is opts js")

packages/hopp-plugin-concat/lib/index.js

@@ -2,7 +2,7 @@
  * @file index.src.js
  * @license MIT
  */
-
+let tmp = false
 /**
  * For node v4.
  */
@@ -18,7 +18,36 @@ export const config = {
 
 /**
  * We don't need to do any real transformation.
+ * suffix and prefix features added
  */
 export default async (ctx, data) => {
+  /**
+   * unexpected num of arguments handling
+   */
+  if (ctx.args.length > 1) {
+    throw new Error('Unexpected numbers of arguments.')
+  }
+
+  /**
+   * options assign
+   *  @param suffix adding string at the end of the each file
+   *  @param prefix adding string at the beginning of the first packet
+   */
+  const opts = ctx.args[0] || {}
+
+  if (config.bundle && !tmp) {
+    // prefix
+    if (opts.prefix) {
+      data.size += opts.prefix.length
+      data.body = opts.prefix + data.body.toString()
+    }
+    // suffix
+    if (opts.suffix) {
+      data.size += opts.suffix.length
+      data.body = data.body.toString() + opts.suffix
+    }
+    tmp = true
+  }
+
   return data
 }