From d6ca48b46a4c829dc908c739efbe287b13ed9298 Mon Sep 17 00:00:00 2001
From: Andrew Kingston <aptkingston@ssl-mail.com>
Date: Fri, 8 Oct 2021 12:06:52 +0100
Subject: [PATCH] Add QOL addons to CodeMirror editor

---
 .../components/common/CodeMirrorEditor.svelte | 146 ++++++++++++++++++
 .../src/components/integration/codemirror.js  |  18 ++-
 2 files changed, 160 insertions(+), 4 deletions(-)

diff --git a/packages/builder/src/components/common/CodeMirrorEditor.svelte b/packages/builder/src/components/common/CodeMirrorEditor.svelte
index e69de29bb2..047f9874a7 100644
--- a/packages/builder/src/components/common/CodeMirrorEditor.svelte
+++ b/packages/builder/src/components/common/CodeMirrorEditor.svelte
@@ -0,0 +1,146 @@
+<script context="module">
+  export const EditorModes = {
+    JS: {
+      name: "javascript",
+      json: false,
+    },
+    JSON: {
+      name: "javascript",
+      json: true,
+    },
+    SQL: {
+      name: "sql",
+    },
+    Handlebars: {
+      name: "handlebars",
+      base: "text/html",
+    },
+  }
+</script>
+
+<script>
+  import CodeMirror from "components/integration/codemirror"
+  import { themeStore } from "builderStore"
+  import { createEventDispatcher, onMount } from "svelte"
+
+  export let mode = EditorModes.JS
+  export let value = ""
+  export let height = 300
+  export let readonly = false
+  export let hints = []
+
+  const dispatch = createEventDispatcher()
+  let textarea
+  let editor
+
+  // Keep editor up to date with value
+  $: editor?.setValue(value || "")
+
+  // Creates an instance of a code mirror editor
+  async function createEditor(mode, value) {
+    if (!CodeMirror || !textarea || editor) {
+      return
+    }
+
+    // Configure CM options
+    const lightTheme = $themeStore.theme.includes("light")
+    const options = {
+      mode,
+      value: value || "",
+      readOnly: readonly,
+      theme: lightTheme ? "default" : "tomorrow-night-eighties",
+
+      // Style
+      lineNumbers: true,
+      lineWrapping: true,
+      indentWithTabs: true,
+      indentUnit: 2,
+      tabSize: 2,
+
+      // QOL addons
+      extraKeys: { "Ctrl-Space": "autocomplete" },
+      styleActiveLine: { nonEmpty: true },
+      autoCloseBrackets: true,
+      matchBrackets: true,
+    }
+
+    // Register hints plugin if desired
+    if (hints?.length) {
+      CodeMirror.registerHelper("hint", "dictionaryHint", function (editor) {
+        const cursor = editor.getCursor()
+        return {
+          list: hints,
+          from: CodeMirror.Pos(cursor.line, cursor.ch),
+          to: CodeMirror.Pos(cursor.line, cursor.ch),
+        }
+      })
+      CodeMirror.commands.autocomplete = function (cm) {
+        CodeMirror.showHint(cm, CodeMirror.hint.dictionaryHint)
+      }
+    }
+
+    // Construct CM instance
+    editor = CodeMirror.fromTextArea(textarea, options)
+
+    // Use a blur handler to update the value
+    editor.on("blur", instance => {
+      dispatch("change", instance.getValue())
+    })
+  }
+
+  // Export a function to expose caret position
+  export const getCaretPosition = () => {
+    const cursor = editor.getCursor()
+    return {
+      start: cursor.ch,
+      end: cursor.ch,
+    }
+  }
+
+  onMount(() => {
+    // Create the editor with initial value
+    createEditor(mode, value)
+
+    // Clean up editor on unmount
+    return () => {
+      if (editor) {
+        editor.toTextArea()
+      }
+    }
+  })
+</script>
+
+<div style={`--code-mirror-height: ${height}px`}>
+  <textarea tabindex="0" bind:this={textarea} readonly {value} />
+</div>
+
+<style>
+  div :global(.CodeMirror) {
+    height: var(--code-mirror-height);
+    font-family: monospace;
+    line-height: 1.3;
+    border: var(--spectrum-alias-border-size-thin) solid;
+    border-color: var(--spectrum-alias-border-color);
+    overflow: hidden;
+    border-radius: var(--border-radius-s);
+  }
+
+  /* Override default active line highlight colour in dark theme */
+  div
+    :global(.CodeMirror-focused.cm-s-tomorrow-night-eighties
+      .CodeMirror-activeline-background) {
+    background: rgba(255, 255, 255, 0.075);
+  }
+
+  /* Remove active line styling when not focused */
+  div
+    :global(.CodeMirror:not(.CodeMirror-focused)
+      .CodeMirror-activeline-background) {
+    background: unset;
+  }
+
+  /* Add a spectrum themed border when focused */
+  div :global(.CodeMirror-focused) {
+    border-color: var(--spectrum-alias-border-color-mouse-focus);
+  }
+</style>
diff --git a/packages/builder/src/components/integration/codemirror.js b/packages/builder/src/components/integration/codemirror.js
index 85a7d05004..c4afd8488c 100644
--- a/packages/builder/src/components/integration/codemirror.js
+++ b/packages/builder/src/components/integration/codemirror.js
@@ -1,12 +1,22 @@
 import CodeMirror from "codemirror"
 import "codemirror/lib/codemirror.css"
-import "codemirror/theme/tomorrow-night-eighties.css"
-import "codemirror/addon/hint/show-hint.css"
-import "codemirror/theme/neo.css"
+
+// Modes
+import "codemirror/mode/javascript/javascript"
 import "codemirror/mode/sql/sql"
 import "codemirror/mode/css/css"
 import "codemirror/mode/handlebars/handlebars"
-import "codemirror/mode/javascript/javascript"
+
+// Hints
 import "codemirror/addon/hint/show-hint"
+import "codemirror/addon/hint/show-hint.css"
+
+// Theming
+import "codemirror/theme/tomorrow-night-eighties.css"
+
+// Functional addons
+import "codemirror/addon/selection/active-line"
+import "codemirror/addon/edit/closebrackets"
+import "codemirror/addon/edit/matchbrackets"
 
 export default CodeMirror