Add --svg option (close #50)

.gitignore

@@ -3,4 +3,5 @@ releases
 dist
 *.pdf
 *.ps
-*.png
+*.png
+*.svg

CHANGELOG.md

@@ -1,3 +1,5 @@
+- Add `--svg` command line option (#50).
+- Improve Lilypond commandline option parsing.
 - Remove non-functional `--open` switch.
 - Improve error reporting (print backtrace only when `--verbose` is specified).
 - Add `--music`/`--music-relative` command line switch for quickly entering music on the command line (#47).

lib/lyp/lilypond.rb

@@ -75,6 +75,8 @@ def parse_lilypond_arg(arg, argv, argv_clean, options)
         options[:mode] = :system
       when '--invoke-quiet'
         options[:mode] = :quiet
+      when '--svg'
+        argv_clean.concat ['-dbackend=svg']
       else
         argv_clean << arg
       end

spec/lilypond_spec.rb

@@ -527,4 +527,11 @@
     expect(o).to eq({verbose: true})
     expect(a).to eq(["--verbose", "myfile.ly"])
   end
+
+  it "supports --svg" do
+    argv = ["--svg", "myfile.ly"]
+    o, a = Lyp::Lilypond.preprocess_argv(argv)
+    expect(o).to eq({})
+    expect(a).to eq(["-dbackend=svg", "myfile.ly"])
+  end
 end