Add full version string

Currently we only provide the version from `package.json`. This means
that during updates of instances, e.g. the demo instance, which runs
latest master instead of a stable release, changes are not reflected to
the webclient.

This patch adds a fullversion string that contains the current commit
and this way makes that clients are notified about changes.

Signed-off-by: Sheogorath <sheogorath@shivering-isles.com>

lib/config/utils.js

@@ -1,5 +1,8 @@
 'use strict'
 
+const fs = require('fs')
+const path = require('path')
+
 exports.toBooleanConfig = function toBooleanConfig (configValue) {
   if (configValue && typeof configValue === 'string') {
     return (configValue === 'true')
@@ -20,3 +23,33 @@ exports.toIntegerConfig = function toIntegerConfig (configValue) {
   }
   return configValue
 }
+
+exports.getGitCommit = function getGitCommit (repodir) {
+  if (!fs.existsSync(repodir + '/.git/HEAD')) {
+    return undefined
+  }
+  let reference = fs.readFileSync(repodir + '/.git/HEAD', 'utf8')
+  if (reference.startsWith('ref: ')) {
+    reference = reference.substr(5).replace('\n', '')
+    reference = fs.readFileSync(path.resolve(repodir + '/.git', reference), 'utf8')
+  }
+  reference = reference.substr(5).replace('\n', '')
+  return reference
+}
+
+exports.getGitHubURL = function getGitHubURL (repo, reference) {
+  // if it's not a github reference, we handle handle that anyway
+  if (!repo.startsWith('https://github.com') && !repo.startsWith('git@github.com')) {
+    return repo
+  }
+  if (repo.startsWith('git@github.com') || repo.startsWith('ssh://git@github.com')) {
+    repo = repo.replace(/^(ssh:\/\/)?git@github.com:/, 'https://github.com/')
+  }
+
+  if (repo.endsWith('.git')) {
+    repo = repo.replace(/\.git$/, '/')
+  } else if (!repo.endsWith('/')) {
+    repo = repo + '/'
+  }
+  return repo + 'tree/' + reference
+}