First kennson version

.gitignore

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+# Files and directories created by pub.
+.dart_tool/
+.packages
+
+# Conventional directory for build output.
+build/
+
+# VS Code
+.vscode

CHANGELOG.md

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+# Changelog
+
+## 1.0.0
+
+- Initial version.

README.md

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+# kennson
+
+A terminal utility to pretty print JSON.

analysis_options.yaml

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+# Defines a default set of lint rules enforced for projects at Google. For
+# details and rationale, see
+# https://github.com/dart-lang/pedantic#enabled-lints.
+
+include: package:pedantic/analysis_options.yaml
+
+# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
+
+# Uncomment to specify additional rules.
+# linter:
+#   rules:
+#     - camel_case_types
+
+# analyzer:
+#   exclude:
+#     - path/to/excluded/files/**

bin/ansi_format.dart

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+const String ESC = '\x1b';
+const String CSI = '$ESC[';
+
+class TextFormat {
+  final List<TextFormat> children;
+
+  const TextFormat({required this.children});
+
+  @override
+  String toString() {
+    return children.join('');
+  }
+}
+
+class ANSIColorText extends TextFormat {
+  final ANSIColor? foreground;
+  final ANSIColor? background;
+
+  ANSIColorText({this.foreground, this.background, required List<TextFormat> children}) : super(children: children);
+
+  @override
+  String toString() {
+    var result = '';
+    for (final child in children) {
+      result += foreground?.enabler ?? '';
+      result += background?.backgroundEnabler ?? '';
+      result += child.toString();
+    }
+    result += foreground?.disabler ?? '';
+    result += background?.backgroundDisabler ?? '';
+    return result;
+  }
+}
+
+class ANSIFormat extends TextFormat {
+  final bool? bold;
+  final bool? italic;
+  final bool? underline;
+  final bool? reverseColor;
+
+  ANSIFormat({this.bold, this.italic, this.underline, this.reverseColor, required List<TextFormat> children}) : super(children: children);
+
+  @override
+  String toString() {
+    var result = '';
+    for (final child in children) {
+      if (bold != null) {
+        result += bold! ? ANSIBold().enabler : ANSIBold().disabler;
+      }
+      if (italic != null) {
+        result += italic! ? ANSIItalic().enabler : ANSIItalic().disabler;
+      }
+      if (underline != null) {
+        result += underline! ? ANSIUnderline().enabler : ANSIUnderline().disabler;
+      }
+      if (reverseColor != null) {
+        result += reverseColor! ? ANSIReverseVideo().enabler : ANSIReverseVideo().disabler;
+      }
+      result += child.toString();
+    }
+    if (bold != null) {
+      result += bold! ? ANSIBold().disabler : ANSIBold().enabler;
+    }
+    if (italic != null) {
+      result += italic! ? ANSIItalic().disabler : ANSIItalic().enabler;
+    }
+    if (underline != null) {
+      result += underline! ? ANSIUnderline().disabler : ANSIUnderline().enabler;
+    }
+    if (reverseColor != null) {
+      result += reverseColor! ? ANSIReverseVideo().disabler : ANSIReverseVideo().enabler;
+    }
+    return result;
+  }
+}
+
+class Text extends TextFormat {
+  final String value;
+  const Text(this.value) : super(children: const []);
+  @override
+  String toString() {
+    return value;
+  }
+}
+
+class ANSIEscape {
+  final String enabler;
+  final String disabler;
+
+  const ANSIEscape({required this.enabler, required this.disabler});
+}
+
+class ANSIBold extends ANSIEscape {
+  const ANSIBold() : super(enabler: '${CSI}1m', disabler: '${CSI}22m');
+}
+
+class ANSIItalic extends ANSIEscape {
+  const ANSIItalic() : super(enabler: '${CSI}3m', disabler: '${CSI}23m');
+}
+
+class ANSIUnderline extends ANSIEscape {
+  const ANSIUnderline() : super(enabler: '${CSI}4m', disabler: '${CSI}24m');
+}
+
+class ANSIReverseVideo extends ANSIEscape {
+  const ANSIReverseVideo() : super(enabler: '${CSI}7m', disabler: '${CSI}27m');
+}
+
+class ANSIColor extends ANSIEscape {
+  const ANSIColor.index(int index, [bool bright = false]) : super(enabler: '$CSI${bright ? 9 : 3}${index}m', disabler: '${CSI}39m');
+  const ANSIColor.value(String value) : super(enabler: '$CSI${value}m', disabler: '${CSI}39m');
+  String get backgroundEnabler {
+    final noCSI = enabler.substring(CSI.length);
+    final nom = noCSI.substring(0, noCSI.length - 1);
+    final number = int.parse(nom);
+    return '$CSI${number + 10}m';
+  }
+  final String backgroundDisabler = '${CSI}49m';
+}
+
+class ANSIColors {
+  static const ANSIColor black = ANSIColor.index(0); 
+  static const ANSIColor red = ANSIColor.index(1);
+  static const ANSIColor green = ANSIColor.index(2);
+  static const ANSIColor yellow = ANSIColor.index(3); 
+  static const ANSIColor blue = ANSIColor.index(4);
+  static const ANSIColor magenta = ANSIColor.index(5); 
+  static const ANSIColor cyan = ANSIColor.index(6);
+  static const ANSIColor white = ANSIColor.index(7);
+  static const ANSIColor brightBlack = ANSIColor.index(0, true); 
+  static const ANSIColor brightRed = ANSIColor.index(1, true);
+  static const ANSIColor brightGreen = ANSIColor.index(2, true);
+  static const ANSIColor brightYellow = ANSIColor.index(3, true); 
+  static const ANSIColor brightBlue = ANSIColor.index(4, true);
+  static const ANSIColor brightMagenta = ANSIColor.index(5, true); 
+  static const ANSIColor brightCyan = ANSIColor.index(6, true);
+  static const ANSIColor brightWhite = ANSIColor.index(7, true);
+}

bin/kennson.dart

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+import 'dart:convert';
+import 'dart:io';
+
+import 'package:args/args.dart';
+import 'package:json_path/json_path.dart';
+import 'package:rfc_6901/rfc_6901.dart';
+
+import 'ppjson.dart';
+
+void main(List<String> arguments) {
+  final parser = ArgParser()
+    ..addOption('file', abbr: 'f', help: 'Read JSON from file instead of stdin', valueHelp: 'filename')
+    ..addOption('input', help: 'Read input as parameter instead of stdin', valueHelp: 'json input')
+    ..addOption('jsonpath', aliases: ['path'], help: 'Display only the matches of the JSON document', valueHelp: 'JSONPath query')
+    ..addOption('jsonpointer', aliases: ['pointer'], abbr: 'p', help: 'Display only the matches of the JSON pointer')
+    ..addOption('indent', abbr: 'i', help: 'Set space indentation level (prefix with t for tab indentation)', defaultsTo: '2')
+    ..addOption('max-depth', abbr: 'm', help: 'Specify maximum nesting before stopping printing');
+    // ..addFlag('force-color', help: "Output using colors even when the environment doesn't allow them", hide: true);
+  final ArgResults parsedArgs;
+  try {
+    parsedArgs = parser.parse(arguments);
+  }
+  on ArgParserException catch(e) {
+    print(e.message);
+    print('');
+    print(parser.usage);
+    exit(1);
+  }
+
+  // Get indent
+  final indentArg = parsedArgs['indent'] as String;
+  final indent = indentArg[0] == 't' ? '\t' * int.parse(indentArg.substring(1)) : ' ' * int.parse(indentArg);
+
+  // Get max depth
+  final maxDepthArg = parsedArgs['max-depth'] as String?;
+  final maxDepth = int.tryParse(maxDepthArg ?? '');
+
+  // Get JSONPath
+  final jsonPath = parsedArgs['jsonpath'] as String?;
+
+  // Get JSON Pointer
+  final jsonPointer = parsedArgs['jsonpointer'] as String?;
+
+  // Read
+  String jsonInput;
+  if (parsedArgs['file'] != null) {
+    jsonInput = File(parsedArgs['file']).readAsStringSync();
+  }
+  else if (parsedArgs['input'] != null) {
+    jsonInput = parsedArgs['input'];
+  }
+  else {
+    jsonInput = '';
+    while (true) {
+      final line = stdin.readLineSync(retainNewlines: true);
+      if (line != null) {
+        jsonInput += line;
+      }
+      else {
+        break;
+      }
+    }
+  }
+
+  // Parse
+  final decodedData;
+  try {
+    decodedData = jsonDecode(jsonInput);
+  }
+  catch(_) {
+    stderr.writeln('Unable to parse JSON input.');
+    exit(1);
+  }
+  final List<dynamic> data;
+  try {
+    data = jsonPath != null ? followJsonPath(decodedData, jsonPath) : jsonPointer != null ? followJsonPointer(decodedData, jsonPointer) : [decodedData];
+  }
+  catch (e) {
+    stderr.writeln('JSONPath Error: $e');
+    exit(1);
+  } 
+
+  // Print
+  if (data.isEmpty) {
+    stderr.writeln('No match');
+  }
+  else if (data.length == 1) {
+    stdout.write(prettyPrintJson(data[0], indent, maxDepth));
+  }
+  else {
+    for (final match in data) {
+      print(prettyPrintJson(match, indent, maxDepth));
+    }
+  }
+}
+
+List<dynamic> followJsonPath(dynamic object, String jsonPath) {
+  final path = JsonPath(jsonPath);
+  return path.read(object).map((e) => e.value).toList(growable: false);
+}
+
+List<dynamic> followJsonPointer(dynamic object, String jsonPointer) {
+  final pointer = JsonPointer(jsonPointer);
+  return [pointer.read(object)];
+}

bin/ppjson.dart

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+import 'ansi_format.dart';
+
+String prettyPrintJson(dynamic object, String indent, [int? maxDepth]) {
+  var result = '';
+  final stack = <_PrettyPrintStackObject>[];
+  stack.add(_PrettyPrintStackObject(object, 0));
+  while (stack.isNotEmpty) {
+    final elem = stack.removeLast();
+    final obj = elem.object is _PrettyPrintTrailingComma ? elem.object.object : elem.object;
+    final trailingComma = elem.object is _PrettyPrintTrailingComma;
+    var suppressTrailingComma = false;
+
+    result += indent * elem.level;
+    String formatObject(dynamic obj) {
+      if (obj is Map) {
+        String startStr;
+        if (obj.isEmpty) {
+          startStr = '{}';
+        }
+        else if (elem.level == maxDepth) {
+          startStr = '{...}';
+        }
+        else {
+          startStr = '{';
+          suppressTrailingComma = true;
+        }
+        final thisResult = ANSIColorText(
+          foreground: ANSIColors.blue,
+          children: [Text(startStr),],
+        ).toString();
+        if (elem.level != maxDepth && obj.isNotEmpty) {
+          stack.add(_PrettyPrintStackObject(trailingComma ? _PrettyPrintTrailingComma(_PrettyPrintMapEnd()) : _PrettyPrintMapEnd(), elem.level));
+          final entries = obj.entries;
+          stack.add(_PrettyPrintStackObject(entries.last, elem.level + 1));
+          stack.addAll(entries.toList(growable: false).reversed.skip(1).map((e) => _PrettyPrintStackObject(_PrettyPrintTrailingComma(e), elem.level + 1)));
+        }
+        return thisResult;
+      }
+      else if (obj is List) {
+        String startStr;
+        if (obj.isEmpty) {
+          startStr = '[]';
+        }
+        else if (elem.level == maxDepth) {
+          startStr = '[...]';
+        }
+        else {
+          startStr = '[';
+          suppressTrailingComma = true;
+        }
+        final thisResult = ANSIColorText(
+          foreground: ANSIColors.cyan,
+          children: [Text(startStr),],
+        ).toString();
+        if (elem.level != maxDepth && obj.isNotEmpty) {
+          stack.add(_PrettyPrintStackObject(trailingComma ? _PrettyPrintTrailingComma(_PrettyPrintArrayEnd()) : _PrettyPrintArrayEnd(), elem.level));
+          stack.add(_PrettyPrintStackObject(obj.last, elem.level + 1));
+          stack.addAll(obj.reversed.skip(1).map((o) => _PrettyPrintStackObject(_PrettyPrintTrailingComma(o), elem.level + 1)));
+        }
+        return thisResult;
+      }
+      else if (obj is MapEntry) {
+        return TextFormat(
+          children: [
+            ANSIColorText(
+              foreground: ANSIColors.brightYellow,
+              children: [Text('"${obj.key}"'),]
+            ),
+            Text(': '),
+            Text(formatObject(obj.value)),
+          ],
+        ).toString();
+      }
+      else if (obj is String) {
+        return ANSIColorText(
+          foreground: ANSIColors.magenta,
+          children: [Text('"$obj"'),],
+        ).toString();
+      }
+      else if (obj is double || obj is int) {
+        return ANSIColorText(
+          foreground: ANSIColors.brightCyan,
+          children: [Text(obj.toString()),],
+        ).toString();
+      }
+      else if (obj == true) {
+        return ANSIFormat(
+          underline: true,
+          children: [
+            ANSIColorText(
+              foreground: ANSIColors.green,
+              children: [Text(obj.toString()),],
+            ),
+          ],
+        ).toString();
+      }
+      else if (obj == false) {
+        return ANSIFormat(
+          underline: true,
+          children: [
+            ANSIColorText(
+              foreground: ANSIColors.red,
+              children: [Text(obj.toString()),],
+            ),
+          ],
+        ).toString();
+      }
+      else if (obj == null) {
+        return ANSIFormat(
+          underline: true,
+          children: [
+            ANSIColorText(
+              foreground: ANSIColors.brightBlue,
+              children: [Text('null'),],
+            ),
+          ],
+        ).toString();
+      }
+      else if (obj is _PrettyPrintMapEnd) {
+        return ANSIColorText(
+          foreground: ANSIColors.blue,
+          children: [Text('}'),],
+        ).toString();
+      }
+      else if (obj is _PrettyPrintArrayEnd) {
+        return ANSIColorText(
+          foreground: ANSIColors.cyan,
+          children: [Text(']'),],
+        ).toString();
+      }
+      else {
+        throw Exception('Unexpected object of unknown type: $obj ${obj.runtimeType}');
+      }
+    }
+    result += formatObject(obj);
+
+    if (trailingComma && !suppressTrailingComma) {
+      result += ',';
+    }
+
+    result += '\n';
+  }
+  return result;
+}
+
+class _PrettyPrintStackObject {
+  final dynamic object;
+  final int level;
+  _PrettyPrintStackObject(this.object, this.level);
+}
+
+class _PrettyPrintTrailingComma {
+  final dynamic object;
+  _PrettyPrintTrailingComma(this.object);
+}
+
+class _PrettyPrintMapEnd {}
+class _PrettyPrintArrayEnd {}

pubspec.lock

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+# Generated by pub
+# See https://dart.dev/tools/pub/glossary#lockfile
+packages:
+  args:
+    dependency: "direct main"
+    description:
+      name: args
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.2.0"
+  json_path:
+    dependency: "direct main"
+    description:
+      name: json_path
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.3.0"
+  meta:
+    dependency: transitive
+    description:
+      name: meta
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.7.0"
+  pedantic:
+    dependency: "direct dev"
+    description:
+      name: pedantic
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "1.11.1"
+  petitparser:
+    dependency: transitive
+    description:
+      name: petitparser
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "4.2.0"
+  rfc_6901:
+    dependency: "direct main"
+    description:
+      name: rfc_6901
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "0.1.0"
+sdks:
+  dart: ">=2.13.0 <3.0.0"

pubspec.yaml

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+name: kennson
+description: A simple command-line application.
+version: 1.0.0
+# homepage: https://www.example.com
+
+environment:
+  sdk: '>=2.12.0 <3.0.0'
+
+dependencies:
+  args: ^2.2.0
+  json_path: ^0.3.0
+  rfc_6901: ^0.1.0
+#   path: ^1.8.0
+
+dev_dependencies:
+  pedantic: ^1.10.0