make syntax highlighting colors configurable

CHANGELOG.md

@@ -5,6 +5,11 @@
 
 # Changelog
 
+## Unreleased
+
+### Enhancement
+ - Syntax highlighting colors are configurable with `config :sql, :syntax_colors`.
+
 ## v0.6.0 (2026-10-06)
 
 ### Enhancement

README.md

@@ -119,6 +119,18 @@ end
   [%User{id: 1, email: "john@example.com"}, %User{id: 2, email: "jane@example.com"}]
 ```
 
+## Syntax highlighting
+
+Override keyword, literal, enclosed, and error colors in `config.exs`:
+
+```elixir
+config :sql, :syntax_colors,
+  keyword: IO.ANSI.magenta(),
+  literal: IO.ANSI.yellow(),
+  enclosed: IO.ANSI.green(),
+  error: IO.ANSI.red()
+```
+
 ## Compile time warning
 Run `mix sql.get` to generate your `sql.lock` file for error reporting.
 

lib/format.ex

@@ -5,11 +5,11 @@ defmodule SQL.Format do
   @moduledoc false
   @moduledoc since: "0.4.0"
 
-  @error IO.ANSI.red()
+  @error Application.compile_env(:sql, [:syntax_colors, :error], IO.ANSI.red())
   @reset IO.ANSI.reset()
-  @keyword IO.ANSI.magenta()
-  @literal IO.ANSI.yellow()
-  @enclosed IO.ANSI.green()
+  @keyword Application.compile_env(:sql, [:syntax_colors, :keyword], IO.ANSI.magenta())
+  @literal Application.compile_env(:sql, [:syntax_colors, :literal], IO.ANSI.yellow())
+  @enclosed Application.compile_env(:sql, [:syntax_colors, :enclosed], IO.ANSI.green())
 
   @compile {:inline, indention: 3, newline: 2, pad: 1, keyword: 2, color: 3}
 

lib/inspect.ex

@@ -4,7 +4,7 @@
 defmodule SQL.Inspect do
   @moduledoc false
 
-  @error IO.ANSI.red()
+  @error Application.compile_env(:sql, [:syntax_colors, :error], IO.ANSI.red())
   @reset IO.ANSI.reset()
 
   defimpl Inspect, for: SQL do