Render post edits and diffs

1 files changed, 77 insertions, 0 deletions

diff --git a/lib/serve.js b/lib/serve.js
index db99b49..b0e1267 100644
--- a/lib/serve.js
+++ b/lib/serve.js
@@ -376,6 +376,7 @@ Serve.prototype.path = function (url) {
     case '/npm-readme': return this.npmReadme(m[2])
     case '/npm-registry': return this.npmRegistry(m[2])
     case '/markdown': return this.markdown(m[2])
+    case '/edit-diff': return this.editDiff(m[2])
     case '/zip': return this.zip(m[2])
     case '/web': return this.web(m[2])
   }
@@ -3466,3 +3467,79 @@ Serve.prototype.emojis = function (path) {
     this.respondSink(200)
   )
 }
+
+Serve.prototype.editDiff = function (url) {
+  var self = this
+  var id
+  try {
+    id = decodeURIComponent(url.substr(1))
+  } catch(err) {
+    return ph('div', u.renderError(err).outerHTML)
+  }
+  return pull(
+    ph('section', {}, [
+      'diff: ',
+      ph('a', {href: self.app.render.toUrl(id)}, id.substr(0, 8) + '…'),
+      u.readNext(function (cb) {
+        self.getMsgDecryptedMaybeOoo(id, function (err, msg) {
+          if (err) return cb(null, pull.once(u.renderError(err).outerHTML))
+          var c = msg.value.content || {}
+          self.getMsgDecryptedMaybeOoo(c.updated, function (err, oldMsg) {
+            if (err) return cb(null, pull.once(u.renderError(err).outerHTML))
+            cb(null, self.postEditDiffTable(oldMsg, msg))
+          })
+        })
+      })
+    ]),
+    self.wrapPage('diff: ' + id),
+    self.respondSink(200)
+  )
+}
+
+Serve.prototype.postEditDiffTable = function (oldMsg, newMsg) {
+  var oldC = oldMsg.value.content || {}
+  var newC = newMsg.value.content || {}
+  var diff = Diff.structuredPatch('', '', String(oldC.text), String(newC.text))
+  var self = this
+  return pull(
+    ph('table', [
+      pull(
+        pull.values(diff.hunks),
+        pull.map(function (hunk) {
+          var oldLine = hunk.oldStart
+          var newLine = hunk.newStart
+          return [
+            ph('tr', [
+              ph('td', {colspan: 2}),
+              ph('td', ph('pre',
+                '@@ -' + oldLine + ',' + hunk.oldLines + ' ' +
+                '+' + newLine + ',' + hunk.newLines + ' @@'))
+            ]),
+            pull(
+              pull.values(hunk.lines),
+              pull.map(function (line) {
+                var s = line[0]
+                if (s == '\\') return
+                var lineNums = [s == '+' ? '' : oldLine++, s == '-' ? '' : newLine++]
+                return [
+                  ph('tr', {
+                    class: s == '+' ? 'diff-new' : s == '-' ? 'diff-old' : ''
+                  }, [
+                    lineNums.map(function (num, i) {
+                      return ph('td', String(num))
+                    }),
+                    ph('td', [
+                     ph('code', s),
+                     u.unwrapP(self.app.render.markdown(line.substr(1),
+                       s == '-' ? oldC.mentions : newC.mentions))
+                    ])
+                  ])
+                ]
+              })
+            )
+          ]
+        })
+      )
+    ])
+  )
+}