feat(pipes): init pipes

src/app/pipes/pipes.module.ts

@@ -0,0 +1,13 @@
+import { NgModule } from '@angular/core';
+
+import { StringTruncatemPipe } from './stringTruncate.pipe';
+
+export const pipes = [
+  StringTruncatemPipe,
+];
+
+@NgModule({
+  declarations: [pipes],
+  exports: [pipes],
+})
+export class PipesModule {}

src/app/pipes/stringTruncate.pipe.ts

@@ -0,0 +1,15 @@
+import { Pipe, PipeTransform } from '@angular/core';
+
+@Pipe({
+  name: 'StringTruncate'
+})
+export class StringTruncatemPipe implements PipeTransform {
+  transform(value?: string, args?: any): any {
+    const bitnum = args;
+    if (value && value.length > bitnum) {
+      return value.substr(0, bitnum) + '...';
+    } else {
+      return value;
+    }
+  }
+}