feat(pre): add initial version of command

lib/type/analyze.js

@@ -0,0 +1,20 @@
+'use strict'
+
+module.exports = function (commits) {
+  var type = null
+
+  commits.every(function (commit) {
+    if (commit.breaks.length) {
+      type = 'major'
+      return false
+    }
+
+    if (commit.type === 'feat') type = 'minor'
+
+    if (!type && commit.type === 'fix') type = 'patch'
+
+    return true
+  })
+
+  return type
+}

lib/type/commits.js

@@ -0,0 +1,14 @@
+'use strict'
+
+var git = require('conventional-changelog/lib/git')
+
+module.exports = function (cb) {
+  git.latestTag(function (err, from) {
+    if (err) return cb(err)
+
+    git.getCommits({from: from}, function (err, commits) {
+      if (err) return cb(err)
+      cb(null, commits)
+    })
+  })
+}

lib/type/index.js

@@ -0,0 +1,12 @@
+'use strict'
+
+var commits = require('./commits')
+var analyze = require('./analyze')
+
+module.exports = function (cb) {
+  commits(function (err, commits) {
+    if (err) return cb(err)
+
+    cb(null, analyze(commits))
+  })
+}