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#!/usr/bin/env node
'use strict';
var os = require('os');
var pidtree = require('..');
// The method startsWith is not defined on string objects in node 0.10
// eslint-disable-next-line no-extend-native
String.prototype.startsWith = function(suffix) {
return this.substring(0, suffix.length) === suffix;
};
function help() {
var help =
' 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';
console.log(help);
}
function list(ppid) {
pidtree(ppid === undefined ? -1 : ppid, function(err, list) {
if (err) {
console.error(err.message);
return;
}
console.log(list.join(os.EOL));
});
}
function tree(ppid) {
pidtree(ppid, {advanced: true}, function(err, list) {
if (err) {
console.error(err.message);
return;
}
var parents = {}; // Hash Map of parents
var tree = {}; // Adiacency Hash Map
while (list.length > 0) {
var 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;
}
}
var roots = [ppid];
if (ppid === -1) {
// Get all the roots
roots = Object.keys(tree).filter(function(node) {
return parents[node] === undefined;
});
}
roots.forEach(function(root) {
print(tree, root);
});
});
function print(tree, start) {
function printBranch(node, branch) {
var isGraphHead = branch.length === 0;
var children = tree[node] || [];
var branchHead = '';
if (!isGraphHead) {
branchHead = children.length > 0 ? '┬ ' : '─ ';
}
console.log(branch + branchHead + node);
var baseBranch = branch;
if (!isGraphHead) {
var isChildOfLastBranch = branch.slice(-2) === '└─';
baseBranch = branch.slice(0, -2) + (isChildOfLastBranch ? ' ' : '| ');
}
var nextBranch = baseBranch + '├─';
var lastBranch = baseBranch + '└─';
children.forEach(function(child, index) {
printBranch(
child,
children.length - 1 === index ? lastBranch : nextBranch
);
});
}
printBranch(start, '');
}
}
function run() {
var flag;
var ppid;
for (var 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();
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