lumis

# Word Diff

```elixir
Mix.install([
  {:lumis, "~> 0.9"},
  {:lumis_wasm_diff, "~> 0.26.0"},
  {:lumis_wasm_elixir, "~> 0.26.0"}
])
```

`lumis_wasm_diff` carries the diff grammar. `lumis_wasm_elixir` colours the hunks,
because the `+++` header names an `.ex` file.

## Example

With `word_diff: true`, a `diff` document also marks the words that changed between
removed lines and the added lines that replace them. The colour comes from the
theme's diff colours. `Logger.debug` has no removed line to pair with, so it keeps
the plain line colour.

```elixir
diff = ~S'''
diff --git a/lib/varsel/cve/cvelint.ex b/lib/varsel/cve/cvelint.ex
--- a/lib/varsel/cve/cvelint.ex
+++ b/lib/varsel/cve/cvelint.ex
@@ -44,6 +44,7 @@ defmodule Varsel.CVE.Cvelint do
   def lint(cve_id, cve_json) do
-    tmp_dir = System.tmp_dir!()
+    tmp_dir = System.tmp_dir!() |> Path.join("lumis")
     File.mkdir_p!(tmp_dir)
     path = Path.join(tmp_dir, "#{cve_id}.json")
-    File.write!(path, Jason.encode!(cve_json))
+    File.write!(path, JSON.encode!(cve_json))
+    Logger.debug("wrote #{path}")
'''

Lumis.highlight!(diff,
  word_diff: true,
  formatter: {:html_inline, language: "diff", theme: "catppuccin_mocha"}
)
```

## In the terminal

```elixir
diff
|> Lumis.highlight!(
  word_diff: true,
  formatter: {:terminal, language: "diff", theme: "catppuccin_mocha"}
)
|> IO.puts()
```