microsoft · lhecker · Jan 26, 2026 · Jan 26, 2026 · Jan 26, 2026 · Jan 27, 2026
diff --git a/.vscode/launch.json b/.vscode/launch.json
@@ -10,7 +10,7 @@
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
+                "${workspaceFolder}/assets/highlighting-tests/markdown.md"
             ],
         },
         {
@@ -23,7 +23,7 @@
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
+                "${workspaceFolder}/assets/highlighting-tests/markdown.md"
             ],
         },
         {
@@ -40,7 +40,7 @@
             "program": "${workspaceFolder}/target/debug/edit",
             "cwd": "${workspaceFolder}",
             "args": [
-                "${workspaceFolder}/crates/edit/src/bin/edit/main.rs"
+                "${workspaceFolder}/assets/highlighting-tests/markdown.md"
             ],
         },
         {

diff --git a/Cargo.lock b/Cargo.lock
diff --git a/assets/highlighting-tests/bash.sh b/assets/highlighting-tests/bash.sh
@@ -0,0 +1,71 @@
+#!/usr/bin/env bash
+
+# This is a comment
+
+readonly VAR1="Hello"   # String literal
+VAR2=42                 # Integer literal
+VAR3=$((VAR2 + 8))      # Arithmetic expansion
+VAR4=$(echo "World")    # Command substitution
+
+function greet() {      # Function definition
+    local name="$1"     # Local variable, parameter expansion
+    echo "${VAR1}, $name! $VAR4"  # String, parameter expansion, variable
+}
+
+greet "User"            # Function call, string literal
+
+if [[ $VAR2 -gt 40 && $VAR3 -eq 50 ]]; then  # Conditional, test, operators
+    echo "Numbers are correct"   # String literal
+elif (( VAR2 < 40 )); then       # Arithmetic test
+    echo 'VAR2 is less than 40'  # Single-quoted string
+else
+    echo "Other case"
+fi
+
+for i in {1..3}; do     # Brace expansion, for loop
+    echo "Loop $i"      # String, variable
+done
+
+case "$VAR4" in         # Case statement
+    World) echo "It's World";;   # Pattern, string
+    *) echo "Unknown";;          # Wildcard
+esac
+
+arr=(one two three)     # Array
+echo "${arr[1]}"        # Array access
+
+declare -A assoc        # Associative array
+assoc[key]="value"
+echo "${assoc[key]}"
+
+# Here document
+cat <<EOF
+Multi-line
+string with $VAR1
+EOF
+
+# Here string
+grep H <<< "$VAR1"
+
+# Subshell
+(subshell_var=99; echo $subshell_var)
+
+# Redirection
+echo "Redirected" > /dev/null
+
+# Background job
+sleep 1 &
+
+# Arithmetic assignment
+let VAR2+=1
+
+# Process substitution
+diff <(echo foo) <(echo bar)
+
+# Command grouping
+{ echo "Group 1"; echo "Group 2"; }
+
+# Escaped characters
+echo "A quote: \" and a backslash: \\"
+
+# End of file
diff --git a/assets/highlighting-tests/batch.bat b/assets/highlighting-tests/batch.bat
@@ -0,0 +1,41 @@
+@echo off
+REM --- String, Variable, Label, Command, Operator, Number, Delimiter, Comment ---
+
+:: Label
+:Start
+
+:: Variable assignment and usage
+set "VAR1=Hello"
+set VAR2=World
+
+:: String with spaces and special characters
+set "STR=Batch ^& CMD!"
+
+:: Arithmetic operation (number, operator)
+set /a SUM=5+10
+
+:: IF statement (keyword, operator, string, variable)
+if "%VAR1%"=="Hello" (
+    echo %VAR1%, %VAR2%! %STR%
+) else (
+    echo Not matched!
+)
+
+:: FOR loop (keyword, variable, delimiter, string)
+for %%F in (*.bat) do (
+    echo Found file: %%F
+)
+
+:: CALL command (keyword, label)
+call :SubRoutine
+
+:: GOTO command (keyword, label)
+goto :End
+
+:: Subroutine with parameter
+:SubRoutine
+echo In subroutine with SUM=%SUM%
+goto :eof
+
+:End
+REM End of script
diff --git a/assets/highlighting-tests/html.html b/assets/highlighting-tests/html.html
@@ -0,0 +1,51 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>HTML Syntax Test &amp; Demo</title>
+    <!-- Comment with special chars: <>&"' -->
+    <style>
+        body {
+            margin: 0;
+            padding: 20px;
+        }
+
+        .test {
+            color: #ff0000;
+        }
+    </style>
+</head>
+
+<body>
+    <h1 id="main" class='header' data-value="123">Heading</h1>
+
+    <!-- Various elements -->
+    <p>Text with &lt; &gt; &amp; &quot; &apos; &#65; &#x41; entities</p>
+    <br />
+    <hr>
+    <img src="image.png" alt="Description" />
+
+    <!-- Attributes -->
+    <input type="text" disabled required value="" data-custom="attr">
+    <button onclick="test()">Click</button>
+
+    <!-- Nested elements -->
+    <div>
+        <span>Inline <strong>bold</strong> text</span>
+        <ul>
+            <li>Item 1</li>
+            <li>Item 2</li>
+        </ul>
+    </div>
+
+    <!-- Script -->
+    <script>
+        function test() {
+            return x < 10 && y > 5;
+        }
+    </script>
+</body>
+
+</html>
diff --git a/assets/highlighting-tests/markdown.md b/assets/highlighting-tests/markdown.md
@@ -0,0 +1,75 @@
+# H1
+
+## H2
+
+### H3
+
+#### H4
+
+##### H5
+
+###### H6
+
+regular
+*italic*
+_italic_
+**bold**
+__bold__
+***bold italic***
+**_bold italic_**
+__*bold italic*__
+~~strikethrough~~
+`inline code`
+`` `literal` ``
+\*not\* \_italic\_ # not a heading
+
+* Unordered item
+  - Nested item
+    * Third level
+* Task list:
+  * [ ] To do
+  * [x] Done
+  * [ ] *Mixed* **formatting** with `code`
+1. Ordered can start anywhere
+2. …like here (intentional)
+   1. Nested ordered
+   2. Multiple paragraphs within a list item:
+      Still the same item.
+
+> A single-level quote
+>
+> > A nested quote with **bold** and `code`
+>
+> * List in a quote
+> * [Link in quote](#links)
+
+Inline: [Example](https://example.com "Example Title")
+Reference: [Ref Link][ref] and [Another][another-ref]
+Relative: [This section](#tables)
+Footnote: [^note]
+[ref]: https://example.com
+[another-ref]: https://github.com
+[^note]: This is a footnote with **formatting** and a [link](https://github.com).
+
+Inline: ![Alt text](https://github.githubassets.com/images/modules/logos_page/GitHub-Mark.png "GitHub Mark")
+Reference: ![Logo][logo-ref]
+[logo-ref]: https://github.githubassets.com/images/modules/logos_page/GitHub-Logo.png "GitHub Logo"
+
+| Left        |   Center   | Right |
+| :---------- | :--------: | ----: |
+| *italic*    |   `code`   |   123 |
+| **bold**    | ~~strike~~ |  4.56 |
+| [link][ref] |   :tada:   | `end` |
+
+```bash
+# Shell
+echo "Hello, world" | tr a-z A-Z
+```
+
+```json
+{
+  "name": "gfm-kitchen-sink",
+  "private": true,
+  "scripts": { "test": "echo ok" }
+}
+```