first commit

2026-10-07 18:56:27 +02:00
commit 2a8a60b725
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+#!/usr/bin/env node
+
+import os from 'node:os';
+import pidtree from '../index.js';
+
+function help() {
+  console.log(
+    '  Usage\n' +
+      '  $ pidtree <ppid>\n' +
+      '\n' +
+      'Options\n' +
+      '  --list                     To print the pids as a list.\n' +
+      '\n' +
+      'Examples\n' +
+      '  $ pidtree\n' +
+      '  $ pidtree --list\n' +
+      '  $ pidtree 1\n' +
+      '  $ pidtree 1 --list\n',
+  );
+}
+
+function list(ppid) {
+  pidtree(ppid === undefined ? -1 : ppid, (error, list) => {
+    if (error) {
+      console.error(error.message);
+      return;
+    }
+
+    console.log(list.join(os.EOL));
+  });
+}
+
+function tree(ppid) {
+  pidtree(ppid, {advanced: true}, (error, list) => {
+    if (error) {
+      console.error(error.message);
+      return;
+    }
+
+    const parents = {}; // Hash Map of parents
+    const tree = {}; // Adjacency Hash Map
+    while (list.length > 0) {
+      const element = list.pop();
+      if (tree[element.ppid]) {
+        tree[element.ppid].push(element.pid);
+      } else {
+        tree[element.ppid] = [element.pid];
+      }
+
+      if (ppid === -1) {
+        parents[element.pid] = element.ppid;
+      }
+    }
+
+    let roots = [ppid];
+    if (ppid === -1) {
+      // Get all the roots.
+      roots = Object.keys(tree).filter((node) => parents[node] === undefined);
+    }
+
+    for (const root of roots) {
+      print(tree, root);
+    }
+  });
+
+  function print(tree, start) {
+    function printBranch(node, branch) {
+      const isGraphHead = branch.length === 0;
+      const children = tree[node] || [];
+
+      let branchHead = '';
+      if (!isGraphHead) {
+        branchHead = children.length > 0 ? '┬ ' : '─ ';
+      }
+
+      console.log(branch + branchHead + node);
+
+      let baseBranch = branch;
+      if (!isGraphHead) {
+        const isChildOfLastBranch = branch.slice(-2) === '└─';
+        baseBranch = branch.slice(0, -2) + (isChildOfLastBranch ? '  ' : '| ');
+      }
+
+      const nextBranch = baseBranch + '├─';
+      const lastBranch = baseBranch + '└─';
+      for (const [index, child] of children.entries()) {
+        printBranch(
+          child,
+          children.length - 1 === index ? lastBranch : nextBranch,
+        );
+      }
+    }
+
+    printBranch(start, '');
+  }
+}
+
+function run() {
+  let flag;
+  let ppid;
+  for (let i = 2; i < process.argv.length; i++) {
+    if (process.argv[i].startsWith('--')) {
+      flag = process.argv[i];
+    } else {
+      ppid = process.argv[i];
+    }
+  }
+
+  if (ppid === undefined) {
+    ppid = -1;
+  }
+
+  if (flag === '--list') {
+    list(ppid);
+  } else if (flag === undefined) {
+    tree(ppid);
+  } else {
+    help();
+  }
+}
+
+run();