Dart: Support for Quick Fixes like in Android Studio

[MaxGyver83]

When I press Alt-Enter with the cursor on a widget in Android Studio, I get a list of actions, delivered by the language server:

I thought, I could get the same in (Neo)vim with :ALECodeAction but the result is only "No code actions received from server".

Then I have activated dart language-server's logging in Android Studio. I believe that these are the relevant requests and responses, probably only the request and the response with id=9 (reformatted for better readability):

1724096755735:Req:
{
  "id": "9",
  "method": "edit.getAssists",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "offset": 1051,
    "length": 0
  },
  "clientRequestTime": 1724096753939
}

1724096755748:Noti:
{
  "event": "analysis.highlights",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "regions": [
      {
        "type": "DIRECTIVE",
        "offset": 0,
        "length": 50
      },
      {
        "type": "BUILT_IN",
        "offset": 0,
        "length": 6
      },
      ...
      {
        "type": "COMMENT_END_OF_LINE",
        "offset": 1776,
        "length": 14
      },
      {
        "type": "COMMENT_END_OF_LINE",
        "offset": 1961,
        "length": 19
      }
    ]
  }
}
1724096755782:Noti:
{
  "event": "analysis.navigation",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "regions": [
      {
        "offset": 7,
        "length": 42,
        "targets": [
          0
        ]
      },
      ...
      {
        "kind": "FIELD",
        "fileIndex": 13,
        "offset": 3886,
        "length": 6,
        "startLine": 106,
        "startColumn": 16
      }
    ],
    "files": [
      "file:///home/max/.pub-cache/hosted/pub.dev/english_words-4.0.0/lib/english_words.dart",
      "file:///opt/flutter/packages/flutter/lib/material.dart",
      "file:///home/max/.pub-cache/hosted/pub.dev/provider-6.1.2/lib/provider.dart",
      "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
      "file:///opt/flutter/packages/flutter/lib/src/widgets/binding.dart",
      "file:///opt/flutter/packages/flutter/lib/src/widgets/framework.dart",
      "file:///opt/flutter/bin/cache/pkg/sky_engine/lib/core/annotations.dart",
      "file:///home/max/.pub-cache/hosted/pub.dev/provider-6.1.2/lib/src/change_notifier_provider.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/app.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/theme_data.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/color_scheme.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/colors.dart",
      "file:///opt/flutter/packages/flutter/lib/src/foundation/change_notifier.dart",
      "file:///home/max/.pub-cache/hosted/pub.dev/english_words-4.0.0/lib/src/word_pair.dart",
      "file:///home/max/.pub-cache/hosted/pub.dev/provider-6.1.2/lib/src/provider.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/scaffold.dart",
      "file:///opt/flutter/packages/flutter/lib/src/widgets/basic.dart",
      "file:///opt/flutter/packages/flutter/lib/src/rendering/flex.dart",
      "file:///opt/flutter/packages/flutter/lib/src/widgets/text.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/elevated_button.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/theme.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/text_theme.dart",
      "file:///opt/flutter/packages/flutter/lib/src/painting/text_style.dart",
      "file:///opt/flutter/packages/flutter/lib/src/material/card.dart",
      "file:///opt/flutter/packages/flutter/lib/src/painting/edge_insets.dart"
    ]
  }
}
1724096755787:Noti:
{
  "event": "analysis.closingLabels",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "labels": [
      {
        "offset": 298,
        "length": 303,
        "label": "ChangeNotifierProvider"
      },
      {
        "offset": 376,
        "length": 218,
        "label": "MaterialApp"
      },
      {
        "offset": 432,
        "length": 125,
        "label": "ThemeData"
      },
      {
        "offset": 1005,
        "length": 540,
        "label": "Scaffold"
      },
      {
        "offset": 1027,
        "length": 511,
        "label": "Center"
      },
      {
        "offset": 1050,
        "length": 479,
        "label": "Column"
      },
      {
        "offset": 1313,
        "length": 192,
        "label": "ElevatedButton"
      },
      {
        "offset": 1912,
        "length": 310,
        "label": "Card"
      },
      {
        "offset": 2014,
        "length": 201,
        "label": "Padding"
      },
      {
        "offset": 2081,
        "length": 125,
        "label": "Text"
      }
    ]
  }
}
1724096755800:Noti:
{
  "event": "analysis.outline",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "kind": "LIBRARY",
    "outline": {
      "element": {
        "kind": "COMPILATION_UNIT",
        "name": "<unit>",
        "location": {
          "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
          "offset": 0,
          "length": 2232,
          "startLine": 1,
          "startColumn": 1,
          "endLine": 99,
          "endColumn": 1
        },
        "flags": 0
      },
      "offset": 0,
      "length": 2232,
      "codeOffset": 0,
      "codeLength": 2232,
      "children": [
      ...
      ]
    }
  }
}
1724096755828:Noti:
{
  "event": "analysis.overrides",
  "params": {
    "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
    "overrides": [
      {
        "offset": 257,
        "length": 5,
        "superclassMember": {
          "element": {
            "kind": "METHOD",
            "name": "build",
            "location": {
              "file": "file:///opt/flutter/packages/flutter/lib/src/widgets/framework.dart",
              "offset": 23424,
              "length": 5,
              "startLine": 569,
              "startColumn": 10,
              "endLine": 569,
              "endColumn": 15
            },
            "flags": 1,
            "parameters": "(BuildContext context)",
            "returnType": "Widget"
          },
          "className": "StatelessWidget"
        }
      },
      {
        "offset": 851,
        "length": 5,
        "superclassMember": {
          "element": {
            "kind": "METHOD",
            "name": "build",
            "location": {
              "file": "file:///opt/flutter/packages/flutter/lib/src/widgets/framework.dart",
              "offset": 23424,
              "length": 5,
              "startLine": 569,
              "startColumn": 10,
              "endLine": 569,
              "endColumn": 15
            },
            "flags": 1,
            "parameters": "(BuildContext context)",
            "returnType": "Widget"
          },
          "className": "StatelessWidget"
        }
      },
      {
        "offset": 1703,
        "length": 5,
        "superclassMember": {
          "element": {
            "kind": "METHOD",
            "name": "build",
            "location": {
              "file": "file:///opt/flutter/packages/flutter/lib/src/widgets/framework.dart",
              "offset": 23424,
              "length": 5,
              "startLine": 569,
              "startColumn": 10,
              "endLine": 569,
              "endColumn": 15
            },
            "flags": 1,
            "parameters": "(BuildContext context)",
            "returnType": "Widget"
          },
          "className": "StatelessWidget"
        }
      }
    ]
  }
}
1724096755854:Res:
{
  "id": "8",
  "result": {
    "hovers": [
      {
        "offset": 1027,
        "length": 6,
        "containingLibraryPath": "/opt/flutter/packages/flutter/lib/src/widgets/basic.dart",
        "containingLibraryName": "package:flutter/src/widgets/basic.dart",
        "containingClassDescription": "Center",
        "dartdoc": "Creates a widget that centers its child.",
        "elementDescription": "(new) Center Center({\n  Key? key,\n  double? widthFactor,\n  double? heightFactor,\n  Widget? child,\n})",
        "elementKind": "constructor",
        "isDeprecated": false
      }
    ]
  }
}
1724096755961:Res:
{
  "id": "9",
  "result": {
    "assists": [
      {
        "message": "t Wrap with widget...",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "widget(\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n            children: [\n              Text('A random AWESOME idea:'),\n              // Text(pair.asLowerCase),\n              BigCard(pair: pair),\n              SizedBox(height: 10),\n              ElevatedButton(\n                onPressed: () {\n                  // print('button pressed!');\n                  appState.getNext();\n                },\n                child: Text('Next'),\n              ),\n            ],\n          ),\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [
          {
            "positions": [
              {
                "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
                "offset": 1050
              }
            ],
            "length": 6,
            "suggestions": []
          },
          {
            "positions": [
              {
                "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
                "offset": 1068
              }
            ],
            "length": 5,
            "suggestions": []
          }
        ],
        "id": "dart.assist.flutter.wrap.generic"
      },
      {
        "message": "Wrap with Builder",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Builder(\n          builder: (context) {\n            return Column(\n              mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n              children: [\n                Text('A random AWESOME idea:'),\n                // Text(pair.asLowerCase),\n                BigCard(pair: pair),\n                SizedBox(height: 10),\n                ElevatedButton(\n                  onPressed: () {\n                    // print('button pressed!');\n                    appState.getNext();\n                  },\n                  child: Text('Next'),\n                ),\n              ],\n            );\n          }\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "id": "dart.assist.flutter.wrap.builder"
      },
      {
        "message": "Wrap with Center",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Center(\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n            children: [\n              Text('A random AWESOME idea:'),\n              // Text(pair.asLowerCase),\n              BigCard(pair: pair),\n              SizedBox(height: 10),\n              ElevatedButton(\n                onPressed: () {\n                  // print('button pressed!');\n                  appState.getNext();\n                },\n                child: Text('Next'),\n              ),\n            ],\n          ),\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "selection": {
          "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
          "offset": 1057
        },
        "selectionLength": 0,
        "id": "dart.assist.flutter.wrap.center"
      },
      {
        "message": "Wrap with Column",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Column(\n          children: [\n            Column(\n              mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n              children: [\n                Text('A random AWESOME idea:'),\n                // Text(pair.asLowerCase),\n                BigCard(pair: pair),\n                SizedBox(height: 10),\n                ElevatedButton(\n                  onPressed: () {\n                    // print('button pressed!');\n                    appState.getNext();\n                  },\n                  child: Text('Next'),\n                ),\n              ],\n            ),\n          ],\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "id": "dart.assist.flutter.wrap.column"
      },
      {
        "message": "Wrap with Container",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Container(\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n            children: [\n              Text('A random AWESOME idea:'),\n              // Text(pair.asLowerCase),\n              BigCard(pair: pair),\n              SizedBox(height: 10),\n              ElevatedButton(\n                onPressed: () {\n                  // print('button pressed!');\n                  appState.getNext();\n                },\n                child: Text('Next'),\n              ),\n            ],\n          ),\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "selection": {
          "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
          "offset": 1060
        },
        "selectionLength": 0,
        "id": "dart.assist.flutter.wrap.container"
      },
      {
        "message": "Wrap with Padding",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Padding(\n          padding: const EdgeInsets.all(8.0),\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n            children: [\n              Text('A random AWESOME idea:'),\n              // Text(pair.asLowerCase),\n              BigCard(pair: pair),\n              SizedBox(height: 10),\n              ElevatedButton(\n                onPressed: () {\n                  // print('button pressed!');\n                  appState.getNext();\n                },\n                child: Text('Next'),\n              ),\n            ],\n          ),\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "selection": {
          "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
          "offset": 1058
        },
        "selectionLength": 0,
        "id": "dart.assist.flutter.wrap.padding"
      },
      {
        "message": "Wrap with Row",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "Row(\n          children: [\n            Column(\n              mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n              children: [\n                Text('A random AWESOME idea:'),\n                // Text(pair.asLowerCase),\n                BigCard(pair: pair),\n                SizedBox(height: 10),\n                ElevatedButton(\n                  onPressed: () {\n                    // print('button pressed!');\n                    appState.getNext();\n                  },\n                  child: Text('Next'),\n                ),\n              ],\n            ),\n          ],\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "id": "dart.assist.flutter.wrap.row"
      },
      {
        "message": "Wrap with SizedBox",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "SizedBox(\n          child: Column(\n            mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n            children: [\n              Text('A random AWESOME idea:'),\n              // Text(pair.asLowerCase),\n              BigCard(pair: pair),\n              SizedBox(height: 10),\n              ElevatedButton(\n                onPressed: () {\n                  // print('button pressed!');\n                  appState.getNext();\n                },\n                child: Text('Next'),\n              ),\n            ],\n          ),\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [],
        "selection": {
          "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
          "offset": 1059
        },
        "selectionLength": 0,
        "id": "dart.assist.flutter.wrap.sizedBox"
      },
      {
        "message": "Wrap with StreamBuilder",
        "edits": [
          {
            "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
            "fileStamp": 0,
            "edits": [
              {
                "offset": 1050,
                "length": 479,
                "replacement": "StreamBuilder<Object>(\n          stream: null,\n          builder: (context, snapshot) {\n            return Column(\n              mainAxisAlignment: MainAxisAlignment.center,  // ← Add this.\n              children: [\n                Text('A random AWESOME idea:'),\n                // Text(pair.asLowerCase),\n                BigCard(pair: pair),\n                SizedBox(height: 10),\n                ElevatedButton(\n                  onPressed: () {\n                    // print('button pressed!');\n                    appState.getNext();\n                  },\n                  child: Text('Next'),\n                ),\n              ],\n            );\n          }\n        )"
              }
            ]
          }
        ],
        "linkedEditGroups": [
          {
            "positions": [
              {
                "file": "file:///media/home/max/dev/flutter/namer_app/lib/main.dart",
                "offset": 1064
              }
            ],
            "length": 6,
            "suggestions": []
          }
        ],
        "id": "dart.assist.flutter.wrap.streamBuilder"
      }
    ]
  }
}

Would it be possible to get the same in vim-ale?

By the way, the example code used here is coming from the Flutter tutorial: Write your first app | Flutter

[MaxGyver83]

One difference I noticed is that dart language-server supports two protocols:

[analyzer]                      Dart's analysis server protocol (https://dart.dev/go/analysis-server-protocol)
[lsp] (default)                 The Language Server Protocol (https://microsoft.github.io/language-server-protocol)

Android Studio uses the first one, vim-ale uses the second one (LSP). This edit.getAssists method shown in my log snippet seems to be specific to Dart's analysis server protocol. Maybe there is an equivalent for this in LSP.

[MaxGyver83]

Next, I have tried vim-lsc + vim-lsc-dart. Using these, I get code actions/quick fixes:

The requests sent by ale and vim-lsc look identical:

ale:

1724231095505:Req:{"method":: "textDocument/codeAction", "jsonrpc":: "2.0", "id":: 8, "params":: {"context":: {"diagnostics":: []}, "range":: {"end":: {"character":: 17, "line":: 73}, "start":: {"character":: 16, "line":: 73}}, "textDocument":: {"uri":: "file::///media/home/max/dev/flutter/namer_app/lib/main.dart"}}}

vim-lsc + vim-lsc-dart:

1724230931471:Req:{"method":: "textDocument/codeAction", "jsonrpc":: "2.0", "id":: 7, "params":: {"context":: {"diagnostics":: []}, "range":: {"end":: {"character":: 17, "line":: 73}, "start":: {"character":: 16, "line":: 73}}, "textDocument":: {"uri":: "file::///media/home/max/dev/flutter/namer_app/lib/main.dart"}}}

Maybe the difference is in the initialization?

ale:

1724231075086:Req:{"method":: "initialize", "jsonrpc":: "2.0", "id":: 1, "params":: {"initializationOptions":: {}, "rootUri":: "file::///media/home/max/dev/flutter", "capabilities":: {"workspace":: {"workspaceFolders":: false, "configuration":: false, "symbol":: {"dynamicRegistration":: false}, "applyEdit":: false, "didChangeConfiguration":: {"dynamicRegistration":: false}}, "textDocument":: {"documentSymbol":: {"dynamicRegistration":: false, "hierarchicalDocumentSymbolSupport":: false}, "references":: {"dynamicRegistration":: false}, "publishDiagnostics":: {"relatedInformation":: true}, "rename":: {"dynamicRegistration":: false}, "completion":: {"completionItem":: {"snippetSupport":: false, "commitCharactersSupport":: false, "preselectSupport":: false, "deprecatedSupport":: false, "documentationFormat":: ["plaintext", "markdown"]}, "contextSupport":: false, "dynamicRegistration":: false}, "synchronization":: {"didSave":: true, "willSaveWaitUntil":: false, "willSave":: false, "dynamicRegistration":: false}, "codeAction":: {"codeActionLiteralSupport":: {"codeActionKind":: {"valueSet":: []}}, "dynamicRegistration":: false}, "typeDefinition":: {"dynamicRegistration":: false}, "hover":: {"dynamicRegistration":: false, "contentFormat":: ["plaintext", "markdown"]}, "implementation":: {"dynamicRegistration":: false, "linkSupport":: false}, "definition":: {"dynamicRegistration":: false, "linkSupport":: false}}}, "rootPath":: "/media/home/max/dev/flutter", "processId":: 12799}}

vim-lsc + vim-lsc-dart:

1724230914878:Req:{"method":: "initialize", "jsonrpc":: "2.0", "id":: 1, "params":: {"rootUri":: "file::///media/home/max/dev/flutter/namer_app", "initializationOptions":: {"onlyAnalyzeProjectsWithOpenFiles":: true}, "capabilities":: {"workspace":: {"configuration":: true, "applyEdit":: true}, "textDocument":: {"publishDiagnostics":: {"dataSupport":: false, "relatedInformation":: false, "codeDescriptionSupport":: false, "versionSupport":: false}, "completion":: {"completionItem":: {"snippetSupport":: false, "tagSupport":: {"valueSet":: [1]}, "deprecatedSupport":: true}}, "synchronization":: {"willSaveWaitUntil":: false, "willSave":: false, "didSave":: false}, "codeAction":: {"codeActionLiteralSupport":: {"codeActionKind":: {"valueSet":: ["quickfix", "refactor", "source"]}}}, "signatureHelp":: {"dynamicRegistration":: false}, "hover":: {"contentFormat":: ["plaintext", "markdown"]}, "definition":: {"dynamicRegistration":: false}}}, "clientInfo":: {"name":: "vim-lsc"}, "processId":: 12134, "trace":: "off"}}