Add simple syntax highlighting

.cargo/debug_refcell.toml

@@ -0,0 +1,3 @@
+[unstable]
+build-std = ["std"]
+build-std-features = ["debug_refcell"]

.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/json.json"
             ],
         },
         {

Cargo.toml

@@ -7,7 +7,7 @@ resolver = "2"
 edition = "2024"
 license = "MIT"
 repository = "https://github.com/microsoft/edit"
-rust-version = "1.88"
+rust-version = "1.92"
 
 # We use `opt-level = "s"` as it significantly reduces binary size.
 # We could then use the `#[optimize(speed)]` attribute for spot optimizations.
@@ -28,5 +28,7 @@ lto = "thin"                # Similarly, speed up linking by a ton
 
 [workspace.dependencies]
 edit = { path = "./crates/edit" }
+lsh = { path = "./crates/lsh" }
+lsh-bin = { path = "./crates/lsh-bin" }
 stdext = { path = "./crates/stdext" }
 unicode-gen = { path = "./crates/unicode-gen" }

assets/highlighting-tests/COMMIT_EDITMSG

@@ -0,0 +1,62 @@
+lsh: flip legacy flag, add follow-up hook & diff test
+
+Refactors placeholder logic and introduces a lightweight follow-up hook.
+Adds diff highlighting test and removes outdated asset to streamline visuals.
+
+# Please enter the commit message for your changes. Lines starting
+# with '#' will be ignored, and an empty message aborts the commit.
+#
+# On branch foobar
+# Your branch is up to date with 'origin/foobar'.
+#
+# Changes to be committed:
+#	renamed:    foo.rs -> bar.rs
+#	modified:   src/lsh/definitions.rs
+#	deleted:    assets/old_logo.svg
+#	new file:   baz.rs
+#
+# ------------------------ >8 ------------------------
+# Do not modify or remove the line above.
+# Everything below it will be ignored.
+diff --git a/src/lsh/definitions.rs b/src/lsh/definitions.rs
+index a1b2c3d..d4c3b2a 100644
+--- a/src/lsh/definitions.rs
++++ b/src/lsh/definitions.rs
+@@ -12,9 +12,11 @@ // context line 12
+ // context line 13
+-// old placeholder logic A
+-const LEGACY_FLAG: bool = true;
+-// end legacy block
++// updated placeholder logic A
++const LEGACY_FLAG: bool = false; // flipped for test
++// added note: migration in progress
++// end legacy block
+ // context line 19
+ // context line 20
+@@ -42,7 +44,12 @@ // context line 42
+ // context line 43
+-    do_placeholder_action(alpha, beta);
++    // Split actions for clarity
++    do_placeholder_prepare(alpha);
++    do_placeholder_action(alpha, beta);
++    if (enable_extra()) {
++        do_placeholder_followup(beta);
++    }
+ // context line 50
+ // context line 51
+ // context line 52
+@@ -90,6 +97,15 @@ // context line 90
+ // context line 91
+ // context line 92
++/// Added lightweight fake helper
++fn enable_extra() -> bool {
++    // Pretend this consults a config value
++    true
++}
++
++// Temporary debug instrumentation (to be removed)
++const _DEBUG_HOOK: &str = "lsh:extra";
++
+ // context line 93
+ // context line 94
+ // context line 95

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

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