/**
* Copyright (c) 2026 Ivan Iraci <ivan.iraci@professioneit.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
import type { DiagnosticsInput } from '../schemas/tool-schemas.js';
import type { DiagnosticsResponse, DiagnosticResult } from '../types.js';
import { prepareFile, getDiagnosticSeverityName } from './utils.js';
import { fromLspRange, getLineContent } from '../utils/position.js';
const SEVERITY_ORDER = { error: 1, warning: 2, info: 3, hint: 4 };
/**
* Handle lsp_diagnostics tool call.
*/
export async function handleDiagnostics(
input: DiagnosticsInput
): Promise<DiagnosticsResponse> {
const { file_path, severity_filter } = input;
const { client, uri, content } = await prepareFile(file_path);
// Get cached diagnostics
const diagnostics = client.getCachedDiagnostics(uri);
// Convert and filter
const results: DiagnosticResult[] = [];
let errors = 0;
let warnings = 0;
let info = 0;
let hints = 0;
for (const diag of diagnostics) {
const severity = getDiagnosticSeverityName(diag.severity);
// Count all for summary
switch (severity) {
case 'error': errors++; break;
case 'warning': warnings++; break;
case 'info': info++; break;
case 'hint': hints++; break;
}
// Filter by severity
if (severity_filter !== 'all') {
const filterLevel = SEVERITY_ORDER[severity_filter];
const diagLevel = SEVERITY_ORDER[severity];
if (diagLevel > filterLevel) {
continue;
}
}
const { start, end } = fromLspRange(diag.range, content);
const contextLine = getLineContent(content, start.line) ?? '';
const result: DiagnosticResult = {
range: { start, end },
severity,
message: diag.message,
context: contextLine.trim(),
};
if (diag.code !== undefined) {
result.code = diag.code;
}
if (diag.source) {
result.source = diag.source;
}
results.push(result);
}
return {
diagnostics: results,
summary: { errors, warnings, info, hints },
note: 'Diagnostics are cached from language server notifications. If file was recently modified, re-open it to refresh.',
};
}
