feat(core): add Electron runtime, services, and app composition

src/window-trackers/x11-tracker.ts

@@ -0,0 +1,199 @@
+/*
+  SubMiner - All-in-one sentence mining overlay
+  Copyright (C) 2024 sudacode
+
+  This program is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  This program is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <https://www.gnu.org/licenses/>.
+*/
+
+import { execFile } from 'child_process';
+import { BaseWindowTracker } from './base-tracker';
+
+type CommandRunner = (command: string, args: string[]) => Promise<string>;
+
+function execFileUtf8(command: string, args: string[]): Promise<string> {
+  return new Promise((resolve, reject) => {
+    execFile(command, args, { encoding: 'utf-8' }, (error, stdout) => {
+      if (error) {
+        reject(error);
+        return;
+      }
+      resolve(stdout);
+    });
+  });
+}
+
+export function parseX11WindowGeometry(winInfo: string): {
+  x: number;
+  y: number;
+  width: number;
+  height: number;
+} | null {
+  const xMatch = winInfo.match(/Absolute upper-left X:\s*(\d+)/);
+  const yMatch = winInfo.match(/Absolute upper-left Y:\s*(\d+)/);
+  const widthMatch = winInfo.match(/Width:\s*(\d+)/);
+  const heightMatch = winInfo.match(/Height:\s*(\d+)/);
+  if (!xMatch || !yMatch || !widthMatch || !heightMatch) {
+    return null;
+  }
+  return {
+    x: parseInt(xMatch[1]!, 10),
+    y: parseInt(yMatch[1]!, 10),
+    width: parseInt(widthMatch[1]!, 10),
+    height: parseInt(heightMatch[1]!, 10),
+  };
+}
+
+export function parseX11WindowPid(raw: string): number | null {
+  const pidMatch = raw.match(/= (\d+)/);
+  if (!pidMatch) {
+    return null;
+  }
+  const pid = Number.parseInt(pidMatch[1]!, 10);
+  return Number.isInteger(pid) ? pid : null;
+}
+
+export class X11WindowTracker extends BaseWindowTracker {
+  private pollInterval: ReturnType<typeof setInterval> | null = null;
+  private readonly targetMpvSocketPath: string | null;
+  private readonly runCommand: CommandRunner;
+  private pollInFlight = false;
+  private currentPollIntervalMs = 750;
+  private readonly stablePollIntervalMs = 250;
+
+  constructor(targetMpvSocketPath?: string, runCommand: CommandRunner = execFileUtf8) {
+    super();
+    this.targetMpvSocketPath = targetMpvSocketPath?.trim() || null;
+    this.runCommand = runCommand;
+  }
+
+  start(): void {
+    this.resetPollInterval(this.currentPollIntervalMs);
+    this.pollGeometry();
+  }
+
+  stop(): void {
+    if (this.pollInterval) {
+      clearInterval(this.pollInterval);
+      this.pollInterval = null;
+    }
+  }
+
+  private resetPollInterval(intervalMs: number): void {
+    if (this.pollInterval) {
+      clearInterval(this.pollInterval);
+      this.pollInterval = null;
+    }
+    this.pollInterval = setInterval(() => this.pollGeometry(), intervalMs);
+  }
+
+  private pollGeometry(): void {
+    if (this.pollInFlight) {
+      return;
+    }
+    this.pollInFlight = true;
+    void this.pollGeometryAsync()
+      .catch(() => {
+        this.updateGeometry(null);
+      })
+      .finally(() => {
+        this.pollInFlight = false;
+      });
+  }
+
+  private async pollGeometryAsync(): Promise<void> {
+    const windowIdsOutput = await this.runCommand('xdotool', ['search', '--class', 'mpv']);
+    const windowIds = windowIdsOutput.trim();
+    if (!windowIds) {
+      this.updateGeometry(null);
+      return;
+    }
+
+    const windowIdList = windowIds.split(/\s+/).filter(Boolean);
+    if (windowIdList.length === 0) {
+      this.updateGeometry(null);
+      return;
+    }
+
+    const windowId = await this.findTargetWindowId(windowIdList);
+    if (!windowId) {
+      this.updateGeometry(null);
+      return;
+    }
+
+    const winInfo = await this.runCommand('xwininfo', ['-id', windowId]);
+    const geometry = parseX11WindowGeometry(winInfo);
+    if (!geometry) {
+      this.updateGeometry(null);
+      return;
+    }
+
+    this.updateGeometry(geometry);
+    if (this.pollInterval && this.currentPollIntervalMs !== this.stablePollIntervalMs) {
+      this.currentPollIntervalMs = this.stablePollIntervalMs;
+      this.resetPollInterval(this.currentPollIntervalMs);
+    }
+  }
+
+  private async findTargetWindowId(windowIds: string[]): Promise<string | null> {
+    if (!this.targetMpvSocketPath) {
+      return windowIds[0] ?? null;
+    }
+
+    for (const windowId of windowIds) {
+      if (await this.isWindowForTargetSocket(windowId)) {
+        return windowId;
+      }
+    }
+
+    return null;
+  }
+
+  private async isWindowForTargetSocket(windowId: string): Promise<boolean> {
+    const pid = await this.getWindowPid(windowId);
+    if (pid === null) {
+      return false;
+    }
+
+    const commandLine = await this.getWindowCommandLine(pid);
+    if (!commandLine) {
+      return false;
+    }
+
+    return (
+      commandLine.includes(`--input-ipc-server=${this.targetMpvSocketPath}`) ||
+      commandLine.includes(`--input-ipc-server ${this.targetMpvSocketPath}`)
+    );
+  }
+
+  private async getWindowPid(windowId: string): Promise<number | null> {
+    let windowPid: string;
+    try {
+      windowPid = await this.runCommand('xprop', ['-id', windowId, '_NET_WM_PID']);
+    } catch {
+      return null;
+    }
+    return parseX11WindowPid(windowPid);
+  }
+
+  private async getWindowCommandLine(pid: number): Promise<string | null> {
+    let raw: string;
+    try {
+      raw = await this.runCommand('ps', ['-p', String(pid), '-o', 'args=']);
+    } catch {
+      return null;
+    }
+    const commandLine = raw.trim();
+    return commandLine || null;
+  }
+}