initial concept

README.md

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+# slackify-html
+
+convert html to slack markdown

package.json

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+{
+  "name": "slackify-html",
+  "version": "1.0.0",
+  "description": "convert simple html to slack markdown",
+  "main": "slackify-html.js",
+  "scripts": {
+    "test": "tap tests.js"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/mrq-cz/slackify-html.git"
+  },
+  "keywords": [
+    "html",
+    "parser",
+    "slack",
+    "to",
+    "html",
+    "markdown"
+  ],
+  "author": "mrq",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/mrq-cz/slackify-html/issues"
+  },
+  "homepage": "https://github.com/mrq-cz/slackify-html",
+  "dependencies": {
+    "html-entities": "^1.1.3",
+    "htmlparser": "^1.7.7"
+  },
+  "devDependencies": {
+    "tap": "^1.4.0"
+  }
+}

slackify-html.js

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+var htmlparser = require('htmlparser'),
+    Entities = require('html-entities').AllHtmlEntities;
+
+entities = new Entities();
+
+module.exports = function slackify(html) {
+  var handler = new htmlparser.DefaultHandler(function (error, dom) {
+    // error ignored
+  });
+  var parser = new htmlparser.Parser(handler);
+  parser.parseComplete(html);
+  var dom = handler.dom;
+  if (dom)
+    return entities.decode(walk(dom));
+  else
+    return '';
+}
+
+function walk(dom) {
+  var out = '';
+  if (dom)
+    dom.forEach(function (el) {
+      if ('text' === el.type) {
+        out += el.data;
+      }
+      if ('tag' === el.type) {
+        switch (el.name) {
+          case 'a':
+            out += '<' + el.attribs.href + '|' + walk(el.children) + '>';
+            break;
+          case 'strong':
+          case 'b':
+            out += '*' + walk(el.children) + '*';
+            break;
+          case 'i':
+          case 'em':
+            out += '_' + walk(el.children) + '_';
+            break;
+          default:
+            out += walk(el.children);
+        }
+      }
+    });
+  return out;
+}

tests.js

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+var tap = require('tap'),
+    slackify = require('./slackify-html');
+
+tap.test('simple', function simple(t) {
+  t.equals(slackify('test'), 'test');
+  t.equals(slackify('test 1'), 'test 1');
+  t.end();
+});
+
+tap.test('tags', function tags(t) {
+  t.equals(slackify('test <b>bold</b>'), 'test *bold*');
+  t.equals(slackify('test <a href="http://example.com">example link</b>'), 'test <http://example.com|example link>');
+  t.end();
+});
+
+tap.test('malformed html', function invalid(t) {
+  t.equals(slackify('test <b>asd'), 'test *asd*');
+  t.equals(slackify('<sad>sab tag</sad>'), 'sab tag');
+  t.equals(slackify('<sad'), '');
+  t.end();
+});
+
+tap.test('empty', function empty(t) {
+  t.equals(slackify(''), '');
+  t.end();
+});
+
+tap.test('vcheck example', function vcheck(t) {
+  t.equals(slackify('<b>2.4-SNAPSHOT</b> &bull; revision <a href="https://a-team.csint.cz/stash/projects/webapi/repos/webapi/commits/a245dc97ec7bbe9ed6cb9fc1025dd846fefc7c89">a245dc9</a> &bull; build 2015-09-07 14:06 &bull; wbl 1.3.33 &bull; <a href="http://www.csast.csas.cz/at/webapi/api/v1/version">details &raquo;</a>'),
+    '*2.4-SNAPSHOT* • revision <https://a-team.csint.cz/stash/projects/webapi/repos/webapi/commits/a245dc97ec7bbe9ed6cb9fc1025dd846fefc7c89|a245dc9> • build 2015-09-07 14:06 • wbl 1.3.33 • <http://www.csast.csas.cz/at/webapi/api/v1/version|details »>');
+  t.end();
+});