Added show non-printing option.

bin/dcat.dart

@@ -8,33 +8,43 @@ import 'package:args/args.dart';
 import 'package:dcat/dcat.dart';
 import 'package:indent/indent.dart';
 
-const appName = libName;
+const appName = 'dcat';
 const appVersion = '1.0.0';
 const helpFlag = 'help';
 const nonBlankFlag = 'number-nonblank';
 const numberFlag = 'number';
+const showAllFlag = 'show-all';
 const showEndsFlag = 'show-ends';
+const showNonPrintingEndsFlag = 'show-nonprinting-ends';
+const showNonPrintingFlag = 'show-nonprinting';
+const showNonPrintingTabsFlag = 'show-nonprinting-tabs';
 const showTabsFlag = 'show-tabs';
 const squeezeBlank = 'squeeze-blank';
 const versionFlag = 'version';
 
 /// Concatenates files specified in [arguments].
 ///
-/// Usage: `dcat [OPTION]... [FILE]...`
+/// Usage: `dcat [option] [file]…`
 Future<int> main(List<String> arguments) async {
   final parser = ArgParser();
   Future<int> returnCode;
   exitCode = exitSuccess;
+  parser.addFlag(showAllFlag,
+      negatable: false, abbr: 'A', help: 'equivalent to -vET');
   parser.addFlag(nonBlankFlag,
       negatable: false,
       abbr: 'b',
       help: 'number nonempty output lines, overrides -n');
+  parser.addFlag(showNonPrintingEndsFlag,
+      negatable: false, abbr: 'e', help: 'equivalent to -vE');
   parser.addFlag(showEndsFlag,
       negatable: false, abbr: 'E', help: 'display \$ at end of each line');
   parser.addFlag(helpFlag,
       negatable: false, abbr: 'h', help: 'display this help and exit');
   parser.addFlag(numberFlag,
       negatable: false, abbr: 'n', help: 'number all output lines');
+  parser.addFlag(showNonPrintingTabsFlag,
+      negatable: false, abbr: 't', help: 'equivalent to -vT');
   parser.addFlag(showTabsFlag,
       negatable: false, abbr: 'T', help: 'display TAB characters as ^I');
   parser.addFlag(squeezeBlank,
@@ -43,6 +53,11 @@ Future<int> main(List<String> arguments) async {
       help: 'suppress repeated empty output lines');
   parser.addFlag(versionFlag,
       negatable: false, help: 'output version information and exit');
+  parser.addFlag('ignored', negatable: false, hide: true, abbr: 'u');
+  parser.addFlag(showNonPrintingFlag,
+      negatable: false,
+      abbr: 'v',
+      help: 'use ^ and M- notation, except for LFD and TAB');
 
   final ArgResults argResults;
   try {
@@ -59,12 +74,30 @@ Future<int> main(List<String> arguments) async {
     returnCode = printVersion();
   } else {
     final paths = argResults.rest;
+    var showEnds = argResults[showEndsFlag];
+    var showTabs = argResults[showTabsFlag];
+    var showNonPrinting = argResults[showNonPrintingFlag];
+
+    if (argResults[showNonPrintingEndsFlag]) {
+      showNonPrinting = showEnds = true;
+    }
+
+    if (argResults[showNonPrintingTabsFlag]) {
+      showNonPrinting = showTabs = true;
+    }
+
+    if (argResults[showAllFlag]) {
+      showNonPrinting = showEnds = showTabs = true;
+    }
+
     returnCode = cat(paths,
-        showEnds: argResults[showEndsFlag],
+        appName: appName,
+        showEnds: showEnds,
         showLineNumbers: argResults[numberFlag],
         numberNonBlank: argResults[nonBlankFlag],
-        showTabs: argResults[showTabsFlag],
-        squeezeBlank: argResults[squeezeBlank]);
+        showTabs: showTabs,
+        squeezeBlank: argResults[squeezeBlank],
+        showNonPrinting: showNonPrinting);
   }
 
   exitCode = await returnCode;
@@ -76,7 +109,7 @@ Future<int> printVersion() async {
   print('''$appName (Dart cat) $appVersion
 Copyright (C) 2021 Erik C. Thauvin
 License: 3-Clause BSD <https://opensource.org/licenses/BSD-3-Clause>
- 
+
 Inspired by <https://dart.dev/tutorials/server/cmdline>
 Written by Erik C. Thauvin <https://erik.thauvin.net/>''');
   return exitSuccess;
@@ -93,7 +126,7 @@ ${options.indent(2)}
 Examples:
   $appName f - g  Output f's contents, then standard input, then g's contents.
   $appName        Copy standard input to standard output.
-  
- Source and documentation: <https://github.com/ethauvin/dcat>''');
+
+Source and documentation: <https://github.com/ethauvin/dcat>''');
   return exitSuccess;
 }