new & opt.

- new: support suspend and WOL #172
- opt.: `execWithPwd` when cancel
- opt.: extentions

lib/view/widget/omit_start_text.dart

@@ -0,0 +1,52 @@
+import 'package:flutter/material.dart';
+
+class OmitStartText extends StatelessWidget {
+  final String text;
+  final int? maxLines;
+  final TextStyle? style;
+  final TextOverflow? overflow;
+
+  const OmitStartText(
+    this.text, {
+    Key? key,
+    this.maxLines,
+    this.style,
+    this.overflow,
+  }) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return LayoutBuilder(builder: (context, size) {
+      bool exceeded = false;
+      int len = 0;
+      for (; !exceeded && len < text.length; len++) {
+        // Build the textspan
+        var span = TextSpan(
+          text: 'A' * 7 + text.substring(text.length - len),
+          style: style ?? Theme.of(context).textTheme.bodyMedium,
+        );
+
+        // Use a textpainter to determine if it will exceed max lines
+        var tp = TextPainter(
+          maxLines: maxLines ?? 1,
+          textDirection: TextDirection.ltr,
+          text: span,
+        );
+
+        // trigger it to layout
+        tp.layout(maxWidth: size.maxWidth);
+
+        // whether the text overflowed or not
+        exceeded = tp.didExceedMaxLines;
+      }
+
+      return Text(
+        (exceeded ? '...' : '') + text.substring(text.length - len),
+        overflow: overflow ?? TextOverflow.fade,
+        softWrap: false,
+        maxLines: maxLines ?? 1,
+        style: style,
+      );
+    });
+  }
+}