From 2d8b96589f17bad9988f54ac79ef241dfe001e7d Mon Sep 17 00:00:00 2001
From: Michael Taranto <michaeltaranto@users.noreply.github.com>
Date: Thu, 27 May 2021 09:44:37 +1000
Subject: [PATCH] feat(editor): Add line numbers (#224)

---
 cypress/support/utils.js                    | 15 +++++---
 src/Playroom/CodeEditor/CodeEditor.less     | 42 +++++++++++++++------
 src/Playroom/CodeEditor/CodeEditor.tsx      | 10 ++++-
 src/Playroom/SplashScreen/SplashScreen.less |  2 +-
 src/Playroom/variables.less                 | 14 ++++---
 5 files changed, 59 insertions(+), 24 deletions(-)

diff --git a/cypress/support/utils.js b/cypress/support/utils.js
index bc4597a9..218b7fa7 100644
--- a/cypress/support/utils.js
+++ b/cypress/support/utils.js
@@ -86,11 +86,16 @@ export const assertFirstFrameContains = (text) => {
 };
 
 export const assertCodePaneContains = (text) => {
-  getCodeEditor().then(($el) => {
-    const code = $el.get(0).innerText;
-    // removes code mirrors invisible last line character placeholder
-    // which is inserted to preserve prettiers new line at end of string.
-    expect(code.replace(/[\u200b]$/, '')).to.eq(text);
+  getCodeEditor().within(() => {
+    const lines = [];
+    cy.get('.CodeMirror-line')
+      .each(($el) => lines.push($el.text()))
+      .then(() => {
+        const code = lines.join('\n');
+        // removes code mirrors invisible last line character placeholder
+        // which is inserted to preserve prettiers new line at end of string.
+        expect(code.replace(/[\u200b]$/, '')).to.eq(text);
+      });
   });
 };
 
diff --git a/src/Playroom/CodeEditor/CodeEditor.less b/src/Playroom/CodeEditor/CodeEditor.less
index 357c289b..21de005c 100644
--- a/src/Playroom/CodeEditor/CodeEditor.less
+++ b/src/Playroom/CodeEditor/CodeEditor.less
@@ -14,13 +14,29 @@
 }
 
 .marker {
-  width: @code-marker-size;
-  height: @code-marker-size;
-  border-radius: (@code-marker-size / 2);
-  background-color: @code-marker-color;
+  @keyframes fadeIn {
+    90% {
+      opacity: 0;
+    }
+    100% {
+      opacity: 1;
+    }
+  }
+
+  border-radius: @radius-large;
+  background-color: @critical-light;
+  color: @critical-dark;
   position: relative;
-  top: (@code-marker-size / 2);
-  left: 10px;
+  left: 4px;
+  margin-right: 4px;
+  text-align: right;
+  opacity: 0;
+  padding-right: 10px;
+  animation-name: fadeIn;
+  animation-duration: 1s;
+  animation-timing-function: ease;
+  animation-iteration-count: 1;
+  animation-fill-mode: forwards;
 }
 
 :global {
@@ -41,10 +57,6 @@
     width: @code-gutter-size;
   }
 
-  .CodeMirror-gutter-elt {
-    position: relative;
-  }
-
   .CodeMirror pre,
   .CodeMirror-linenumber {
     font-size: 16px;
@@ -102,7 +114,15 @@
       background: @code-selection;
     }
     .CodeMirror-linenumber {
-      color: @white;
+      box-sizing: border-box;
+      width: @code-gutter-size !important;
+      padding-left: 8px;
+      padding-right: @code-line-gutter;
+      color: @gray-4;
+      transition: @transition-fast;
+      &:not(:hover) {
+        opacity: 0.4;
+      }
     }
     .cm-tag {
       color: @code-format-tag;
diff --git a/src/Playroom/CodeEditor/CodeEditor.tsx b/src/Playroom/CodeEditor/CodeEditor.tsx
index 105178fc..9f8dd42d 100644
--- a/src/Playroom/CodeEditor/CodeEditor.tsx
+++ b/src/Playroom/CodeEditor/CodeEditor.tsx
@@ -76,7 +76,14 @@ const validateCode = (editorInstance: Editor, code: string) => {
     if (lineNumber) {
       const marker = document.createElement('div');
       marker.classList.add(styles.marker);
-      marker.setAttribute('title', err.message);
+      marker.setAttribute(
+        'title',
+        // Remove our wrapping Fragment from error message
+        (err.message || '')
+          .replace(/\<React\.Fragment\>/, '')
+          .replace(/\<\/React\.Fragment\>$/, '')
+      );
+      marker.innerText = String(lineNumber);
       editorInstance.setGutterMarker(lineNumber - 1, styles.gutter, marker);
     }
   }
@@ -251,6 +258,7 @@ export const CodeEditor = ({ code, onChange, previewCode, hints }: Props) => {
         gutters: [styles.gutter],
         hintOptions: { schemaInfo: hints },
         viewportMargin: 50,
+        lineNumbers: true,
         extraKeys: {
           Tab: (cm) => {
             if (cm.somethingSelected()) {
diff --git a/src/Playroom/SplashScreen/SplashScreen.less b/src/Playroom/SplashScreen/SplashScreen.less
index 9ff8bd03..7a94f82a 100644
--- a/src/Playroom/SplashScreen/SplashScreen.less
+++ b/src/Playroom/SplashScreen/SplashScreen.less
@@ -15,7 +15,7 @@
   align-items: center;
   justify-content: center;
   text-align: center;
-  background: @gray-5;
+  background: @gray-6;
   color: @white;
   transition: @transition-speed-slow;
 }
diff --git a/src/Playroom/variables.less b/src/Playroom/variables.less
index cbb21979..7cee556d 100644
--- a/src/Playroom/variables.less
+++ b/src/Playroom/variables.less
@@ -12,7 +12,7 @@
 @text-standard: normal 14px @typography-family;
 @text-small: normal 12px @typography-family;
 @text-xsmall: normal 10px @typography-family;
-@text-neutral: @gray-4;
+@text-neutral: @gray-5;
 
 // Weight
 @bold: 700;
@@ -27,12 +27,14 @@
 @green-2: #1da584;
 @red-1: #fed6e1;
 @red-2: #e52b50;
+@red-3: #c3183a;
 @white: #fff;
 @gray-1: #f4f4f4;
 @gray-2: #e8e8e8;
 @gray-3: #a7a7a7;
-@gray-4: #515151;
-@gray-5: #1e1e1e;
+@gray-4: #767676;
+@gray-5: #515151;
+@gray-6: #1e1e1e;
 @black: #000;
 
 // Tones
@@ -40,6 +42,7 @@
 @positive: @green-2;
 @critical-light: @red-1;
 @critical: @red-2;
+@critical-dark: @red-3;
 @neutral: @gray-2;
 
 // Highlights
@@ -76,9 +79,8 @@
 // Code Editor
 @code-background: @white;
 @code-font-family: Source Code Pro, Firacode, Hasklig, Menlo, monospace;
-@code-gutter-size: @gutter-width;
-@code-marker-size: @grid * 3;
-@code-marker-color: @highlight;
+@code-gutter-size: @gutter-width * 1.75;
+@code-line-gutter: 20px;
 @code-format-tag: @blue-4;
 @code-format-attribute: @blue-2;
 @code-format-string: @blue-3;