#!/usr/bin/env node

var fs = require("fs");

var text = "";

process.stdin.resume();

process.stdin.on("data", function(data) {

text += data.toString("utf8");

});

process.stdin.on("end", function() {

var mark = hash(startAndEnd(toPlainText(text)));

process.stdout.write("<a class=p_ident id=\"p_" + mark + "\" href=\"#p_" + mark + "\"></a>" + text, "utf8");

});

function hash(string) {

var sum = require("crypto").createHash("sha1");

sum.update(string);

return sum.digest("base64").slice(0, 10);

}

function toPlainText(text) {

return text.replace(/<[^>]+>|&[^;]+;/g, "");

}

function startAndEnd(text) {

var words = text.split(/\W+/);

if (!words[0]) words.shift();

if (!words[words.length - 1]) words.pop();

if (words.length <= 6) return words.join(" ");

return words.slice(0, 3).join(" ") + " " + words.slice(words.length - 3).join(" ");

}