1 files changed, 80 insertions, 0 deletions
diff --git a/lib/util.js b/lib/util.js
new file mode 100644
index 0000000..d6c3133
--- /dev/null
+++ b/lib/util.js
@@ -0,0 +1,80 @@
+var pull = require('pull-stream')
+var cat = require('pull-cat')
+var h = require('hyperscript')
+var u = exports
+
+u.ssbRefRegex = /((?:@|%|&)[A-Za-z0-9\/+]{43}=\.[\w\d]+)/g
+
+u.isRef = function (str) {
+  u.ssbRefRegex.lastIndex = 0
+  return u.ssbRefRegex.test(str)
+}
+
+u.readNext = function (fn) {
+  var next
+  return function (end, cb) {
+    if (next) return next(end, cb)
+    fn(function (err, _next) {
+      if (err) return cb(err)
+      next = _next
+      next(null, cb)
+    })
+  }
+}
+
+u.pullReverse = function () {
+  return function (read) {
+    return u.readNext(function (cb) {
+      pull(read, pull.collect(function (err, items) {
+        cb(err, items && pull.values(items.reverse()))
+      }))
+    })
+  }
+}
+
+u.toHTML = function (el) {
+  if (!el) return ''
+  if (typeof el === 'string' || Array.isArray(el)) {
+    return h('div', el).innerHTML
+  }
+  var html = el.outerHTML || String(el)
+  if (el.nodeName === 'html') html = '<!doctype html>' + html + '\n'
+  return html
+}
+
+u.hyperwrap = function (fn) {
+  var token = '__HYPERWRAP_' + Math.random() + '__'
+  return function (read) {
+    return u.readNext(function (cb) {
+      fn(token, function (err, el) {
+        if (err) return cb(err)
+        var parts = u.toHTML(el).split(token)
+        switch (parts.length) {
+          case 0: return cb(null, pull.empty())
+          case 1: return cb(null, pull.once(parts[0]))
+          case 2: return cb(null,
+            cat([pull.once(parts[0]), read, pull.once(parts[1])]))
+          default: return cb(new Error('duplicate wrap'))
+        }
+      })
+    })
+  }
+}
+
+u.linkDest = function (link) {
+  return typeof link === 'string' ? link : link && link.link || link
+}
+
+u.toArray = function (x) {
+  return !x ? [] : Array.isArray(x) ? x : [x]
+}
+
+u.fromArray = function (arr) {
+  return Array.isArray(arr) && arr.length === 1 ? arr[0] : arr
+}
+
+u.renderError = function(err) {
+  return h('div.error',
+    h('h3', err.name),
+    h('pre', err.stack))
+}