Improve rendering of commit branching graph

Summary:
Fixes T9323. Two minor fixes:

  - On the first commit, don't render a downward line.
  - Clean up a 1px spacing issue that had cropped up a while ago when we added icons or something, I think.

Test Plan:
Before:

{F1057248}

After:

{F1057249}

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T9323

Differential Revision: https://secure.phabricator.com/D14974

resources/celerity/map.php

@@ -13,7 +13,7 @@ return array(
     'differential.pkg.css' => '2de124c9',
     'differential.pkg.js' => '64e69521',
     'diffusion.pkg.css' => 'f45955ed',
-    'diffusion.pkg.js' => 'ca1c8b5a',
+    'diffusion.pkg.js' => '3a9a8bfa',
     'maniphest.pkg.css' => '4845691a',
     'maniphest.pkg.js' => '949a7498',
     'rsrc/css/aphront/aphront-bars.css' => '231ac33c',
@@ -391,7 +391,7 @@ return array(
     'rsrc/js/application/diffusion/DiffusionLocateFileSource.js' => 'b42eddc7',
     'rsrc/js/application/diffusion/behavior-audit-preview.js' => 'd835b03a',
     'rsrc/js/application/diffusion/behavior-commit-branches.js' => 'bdaf4d04',
-    'rsrc/js/application/diffusion/behavior-commit-graph.js' => '9007c197',
+    'rsrc/js/application/diffusion/behavior-commit-graph.js' => '5a0b1a64',
     'rsrc/js/application/diffusion/behavior-jump-to.js' => '73d09eef',
     'rsrc/js/application/diffusion/behavior-load-blame.js' => '42126667',
     'rsrc/js/application/diffusion/behavior-locate-file.js' => '6d3e1947',
@@ -598,7 +598,7 @@ return array(
     'javelin-behavior-differential-toggle-files' => 'ca3f91eb',
     'javelin-behavior-differential-user-select' => 'a8d8459d',
     'javelin-behavior-diffusion-commit-branches' => 'bdaf4d04',
-    'javelin-behavior-diffusion-commit-graph' => '9007c197',
+    'javelin-behavior-diffusion-commit-graph' => '5a0b1a64',
     'javelin-behavior-diffusion-jump-to' => '73d09eef',
     'javelin-behavior-diffusion-locate-file' => '6d3e1947',
     'javelin-behavior-diffusion-pull-lastmodified' => 'f01586dc',
@@ -1218,6 +1218,11 @@ return array(
       'javelin-vector',
       'javelin-dom',
     ),
+    '5a0b1a64' => array(
+      'javelin-behavior',
+      'javelin-dom',
+      'javelin-stratcom',
+    ),
     '5b2e3e2b' => array(
       'javelin-stratcom',
       'javelin-request',
@@ -1523,11 +1528,6 @@ return array(
       'javelin-dom',
       'javelin-workflow',
     ),
-    '9007c197' => array(
-      'javelin-behavior',
-      'javelin-dom',
-      'javelin-stratcom',
-    ),
     '901935ef' => array(
       'javelin-behavior',
       'javelin-dom',

src/applications/diffusion/controller/DiffusionHistoryController.php

@@ -52,6 +52,7 @@ final class DiffusionHistoryController extends DiffusionController {
     if ($show_graph) {
       $history_table->setParents($history_results['parents']);
       $history_table->setIsHead(!$pager->getOffset());
+      $history_table->setIsTail(!$pager->getHasMorePages());
     }
 
     $history_panel = new PHUIObjectBoxView();

src/applications/diffusion/view/DiffusionHistoryTableView.php

@@ -6,6 +6,7 @@ final class DiffusionHistoryTableView extends DiffusionView {
   private $revisions = array();
   private $handles = array();
   private $isHead;
+  private $isTail;
   private $parents;
 
   public function setHistory(array $history) {
@@ -60,6 +61,11 @@ final class DiffusionHistoryTableView extends DiffusionView {
     return $this;
   }
 
+  public function setIsTail($is_tail) {
+    $this->isTail = $is_tail;
+    return $this;
+  }
+
   public function render() {
     $drequest = $this->getDiffusionRequest();
 
@@ -344,6 +350,16 @@ final class DiffusionHistoryTableView extends DiffusionView {
       );
     }
 
+    // If this is the last page in history, replace the "o" with an "x" so we
+    // do not draw a connecting line downward, and replace "^" with an "X" for
+    // repositories with exactly one commit.
+    if ($this->isTail && $graph) {
+      $last = array_pop($graph);
+      $last['line'] = str_replace('o', 'x', $last['line']);
+      $last['line'] = str_replace('^', 'X', $last['line']);
+      $graph[] = $last;
+    }
+
     // Render into tags for the behavior.
 
     foreach ($graph as $k => $meta) {

src/view/phui/PHUIPagerView.php

@@ -58,6 +58,10 @@ final class PHUIPagerView extends AphrontView {
     return $this->hasMorePages;
   }
 
+  public function getHasMorePages() {
+    return $this->hasMorePages;
+  }
+
   public function setSurroundingPages($pages) {
     $this->surroundingPages = max(0, $pages);
     return $this;

webroot/rsrc/js/application/diffusion/behavior-commit-graph.js

@@ -37,6 +37,7 @@ JX.behavior('diffusion-commit-graph', function(config) {
 
   // Stroke with fill (for commit circles).
   function fstroke(c) {
+    cxt.lineWidth = 1;
     cxt.fillStyle = color(c);
     cxt.strokeStyle = '#ffffff';
     cxt.fill();
@@ -52,7 +53,7 @@ JX.behavior('diffusion-commit-graph', function(config) {
       return (col * cell) + (cell / 2);
     };
 
-    var h = 30;
+    var h = 32;
     var w = cell * config.count;
 
     var canvas = JX.$N('canvas', {width: w, height: h});
@@ -117,16 +118,17 @@ JX.behavior('diffusion-commit-graph', function(config) {
         case 'o':
         case '^':
         case '|':
-          if (c == 'o' || c == '^') {
-            origin = xpos(jj);
-          }
+        case 'x':
+        case 'X':
 
+          if (c !== 'X') {
             cxt.beginPath();
             cxt.moveTo(xpos(jj), (c == '^' ? h/2 : 0));
-          cxt.lineTo(xpos(jj), h);
+            cxt.lineTo(xpos(jj), (c == 'x' ? h/2 : h));
             lstroke(jj);
+          }
 
-          if (c == 'o' || c == '^') {
+          if (c == 'o' || c == '^' || c == 'x' || c == 'X') {
             cxt.beginPath();
             cxt.arc(xpos(jj), h/2, 3, 0, 2 * Math.PI, true);
             fstroke(jj);