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import * as vscode from 'vscode';
const fnRegex = /^\t*(.*)err\s?:=.+?$/
export function activate(context: vscode.ExtensionContext) {
context.subscriptions.push(
vscode.languages.registerCodeActionsProvider(
'go',
new ErrorsWrapper(),
{ providedCodeActionKinds: ErrorsWrapper.providedCodeActionKinds }
)
);
context.subscriptions.push(
vscode.commands.registerCommand('gotools.wrap-error', wrapError)
);
}
export function deactivate() { }
export class ErrorsWrapper implements vscode.CodeActionProvider {
public static readonly providedCodeActionKinds = [
vscode.CodeActionKind.RefactorRewrite
];
public provideCodeActions(document: vscode.TextDocument, range: vscode.Range): vscode.CodeAction[] | undefined {
const editor = vscode.window.activeTextEditor;
if (!editor) {
return undefined;
}
const line = document.lineAt(editor.selection.start.line);
if (!fnRegex.test(line.text)) {
return undefined;
}
const action = new vscode.CodeAction('Add error checking', vscode.CodeActionKind.RefactorRewrite);
action.command = { command: 'gotools.wrap-error', title: 'Add error checking block', tooltip: '' };
return [
action,
];
}
}
const wrapError = () => {
const editor = vscode.window.activeTextEditor;
if (!editor) {
return;
}
const document = editor.document;
const line = document.lineAt(editor.selection.start.line);
const matches = line.text.match(fnRegex);
if (matches == null || matches.length == 0) {
return;
}
const extravars = matches[1].split(',').map(x => x.trim()).filter(x => x);
if (extravars.filter(x => x != "_").length > 0) {
editor.insertSnippet(
new vscode.SnippetString(`\nif err != nil {\n\t\${1:return \${2:nil, }\${3:err}}\n}\n`),
new vscode.Position(line.range.end.line, line.range.end.character + line.firstNonWhitespaceCharacterIndex),
)
} else {
editor.insertSnippet(
new vscode.SnippetString(`if `),
new vscode.Position(line.range.start.line, line.range.start.character + line.firstNonWhitespaceCharacterIndex),
)
editor.insertSnippet(
new vscode.SnippetString(`; err != nil {\n\t\${1:return \${2:nil, }\${3:err}}\n}\n`),
new vscode.Position(line.range.end.line, line.range.end.character + line.firstNonWhitespaceCharacterIndex + 3),
{
undoStopAfter: true,
undoStopBefore: false,
}
)
}
};
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