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import * as child_process from 'child_process';
import * as path from 'path';
import * as timers from 'timers';
import * as vscode from 'vscode';
import {StatusDisplay} from './watch_status';
export class CargoWatchProvider {
private diagnosticCollection?: vscode.DiagnosticCollection;
private cargoProcess?: child_process.ChildProcess;
private outBuffer: string = '';
private statusDisplay?: StatusDisplay;
public activate(subscriptions: vscode.Disposable[]) {
subscriptions.push(this);
this.diagnosticCollection = vscode.languages.createDiagnosticCollection('rustc');
this.statusDisplay = new StatusDisplay(subscriptions);
// Start the cargo watch with json message
this.cargoProcess = child_process.spawn('cargo',
['watch', '-x', '\"check --message-format json\"'],
{
// stdio: ['ignore', 'pipe', 'ignore'],
shell: true,
cwd: vscode.workspace.rootPath,
});
this.cargoProcess.stdout.on('data', (s: string) => {
this.processOutput(s);
});
this.cargoProcess.stderr.on('data', (s: string) => {
// console.error('Error on cargo watch : ' + s);
});
this.cargoProcess.on('error', (err: Error) => {
// console.error('Error on spawn cargo process : ' + err);
});
}
public dispose(): void {
if (this.diagnosticCollection) {
this.diagnosticCollection.clear();
this.diagnosticCollection.dispose();
}
if (this.cargoProcess) {
this.cargoProcess.kill();
}
}
private parseLine(line: string) {
if (line.startsWith('[Running')) {
this.diagnosticCollection!.clear();
this.statusDisplay!.show();
}
if (line.startsWith('[Finished running')) {
this.statusDisplay!.hide();
}
function getLevel(s: string): vscode.DiagnosticSeverity {
if (s === 'error') {
return vscode.DiagnosticSeverity.Error;
}
if (s.startsWith('warn')) {
return vscode.DiagnosticSeverity.Warning;
}
return vscode.DiagnosticSeverity.Information;
}
// cargo-watch itself output non json format
// Ignore these lines
let data = null;
try {
data = JSON.parse(line.trim());
} catch (error) {
return;
}
// Only handle compiler-message now
if (data.reason !== 'compiler-message') {
return;
}
let spans: any[] = data.message.spans;
spans = spans.filter(o => o.is_primary);
// We only handle primary span right now.
if (spans.length > 0) {
const o = spans[0];
const rendered = data.message.rendered;
const level = getLevel(data.message.level);
const range = new vscode.Range(
new vscode.Position(o.line_start - 1, o.column_start - 1),
new vscode.Position(o.line_end - 1, o.column_end - 1)
);
const fileName = path.join(vscode.workspace.rootPath!, o.file_name);
const diagnostic = new vscode.Diagnostic(range, rendered, level);
diagnostic.source = 'rustc';
diagnostic.code = data.message.code.code;
diagnostic.relatedInformation = [];
const fileUrl = vscode.Uri.file(fileName!);
const diagnostics: vscode.Diagnostic[] = [...(this.diagnosticCollection!.get(fileUrl) || [])];
diagnostics.push(diagnostic);
this.diagnosticCollection!.set(fileUrl, diagnostics);
}
}
private processOutput(chunk: string) {
// The stdout is not line based, convert it to line based for proceess.
this.outBuffer += chunk;
let eolIndex = this.outBuffer.indexOf('\n');
while (eolIndex >= 0) {
// line includes the EOL
const line = this.outBuffer.slice(0, eolIndex + 1);
this.parseLine(line);
this.outBuffer = this.outBuffer.slice(eolIndex + 1);
eolIndex = this.outBuffer.indexOf('\n');
}
}
}
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