feat: higher level API (to_html and to_ansi)

README.md

@@ -45,18 +45,35 @@ $ tartrazine whatever.c -t catppuccin-macchiato --line-numbers \
 
 ## Usage as a Library
 
-This works:
+This is the high level API:
 
 ```crystal
 require "tartrazine"
 
-lexer = Tartrazine.lexer("crystal")
-theme = Tartrazine.theme("catppuccin-macchiato")
-formatter = Tartrazine::Html.new
-formatter.theme = theme
-puts formatter.format(File.read(ARGV[0]), lexer)
+html = Tartrazine.to_html(
+  "puts \"Hello, world!\"",
+  language: "crystal",
+  theme: "catppuccin-macchiato",
+  standalone: true,
+  line_numbers: true
+)
 ```
 
+This does more or less the same thing, but more manually:
+
+```crystal
+lexer = Tartrazine.lexer("crystal")
+formatter = Tartrazine::Html.new (
+  theme: Tartrazine.theme("catppuccin-macchiato"),
+  line_numbers: true,
+  standalone: true,
+)
+puts formatter.format("puts \"Hello, world!\"", lexer)
+```
+
+The reason you may want to use the manual version is to reuse
+the lexer and formatter objects for performance reasons.
+
 ## Contributing
 
 1. Fork it (<https://github.com/ralsina/tartrazine/fork>)

spec/tartrazine_spec.cr

@@ -69,6 +69,31 @@ describe Tartrazine do
       end
     end
   end
+
+  describe "to_html" do
+    it "should do basic highlighting" do
+      html = Tartrazine.to_html("puts 'Hello, World!'", "ruby", standalone: false)
+      html.should eq(
+        "<pre class=\"b\" ><code class=\"b\"><span class=\"nb\">puts</span><span class=\"t\"> </span><span class=\"lss\">&#39;Hello, World!&#39;</span></code></pre>"
+      )
+    end
+  end
+  describe "to_ansi" do
+    it "should do basic highlighting" do
+      ansi = Tartrazine.to_ansi("puts 'Hello, World!'", "ruby")
+      if ENV.fetch("CI", nil)
+        # In Github Actions there is no terminal so these don't
+        # really work
+        ansi.should eq(
+          "puts 'Hello, World!'"
+        )
+      else
+        ansi.should eq(
+          "\e[38;2;171;70;66mputs\e[0m\e[38;2;216;216;216m \e[0m'Hello, World!'"
+        )
+      end
+    end
+  end
 end
 
 # Helper that creates lexer and tokenizes

src/formatters/ansi.cr

@@ -1,6 +1,15 @@
 require "../formatter"
 
 module Tartrazine
+  def self.to_ansi(text : String, language : String,
+                   theme : String = "default-dark",
+                   line_numbers : Bool = false) : String
+    Tartrazine::Ansi.new(
+      theme: Tartrazine.theme(theme),
+      line_numbers: line_numbers
+    ).format(text, Tartrazine.lexer(name: language))
+  end
+
   class Ansi < Formatter
     property? line_numbers : Bool = false
 

src/formatters/html.cr

@@ -3,6 +3,17 @@ require "../formatter"
 require "html"
 
 module Tartrazine
+  def self.to_html(text : String, language : String,
+                   theme : String = "default-dark",
+                   standalone : Bool = true,
+                   line_numbers : Bool = false) : String
+    Tartrazine::Html.new(
+      theme: Tartrazine.theme(theme),
+      standalone: standalone,
+      line_numbers: line_numbers
+    ).format(text, Tartrazine.lexer(name: language))
+  end
+
   class Html < Formatter
     # property line_number_in_table : Bool = false
     # property with_classes : Bool = true