From 1da076773d523f6cd0cd8f233e6f8ae73a693391 Mon Sep 17 00:00:00 2001
From: Oliverpool <oliverpool@hotmail.fr>
Date: Mon, 9 Nov 2015 07:30:11 +0100
Subject: [PATCH] Test for lilypond compiler before starting compilation

---
 patacrep/build.py | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/patacrep/build.py b/patacrep/build.py
index a720b9b1..f3391744 100644
--- a/patacrep/build.py
+++ b/patacrep/build.py
@@ -123,6 +123,9 @@ class Songbook(object):
 
         renderer.render_tex(output, config)
 
+    def requires_lilypond(self):
+        return 'lilypond' in self.config.get('bookoptions', [])
+
 def _log_pipe(pipe):
     """Log content from `pipe`."""
     while 1:
@@ -227,6 +230,20 @@ class SongbookBuilder(object):
         except Exception as error:
             raise errors.ExecutableNotFound(compiler)
 
+        # Test if lilypond compiler is accessible
+        lilypond_compiler = 'lilypond'
+        if self.songbook.requires_lilypond():
+            try:
+                check_call(
+                    [lilypond_compiler, "--version"],
+                    stdin=PIPE,
+                    stdout=PIPE,
+                    stderr=PIPE,
+                    universal_newlines=True,
+                    )
+            except Exception as error:
+                raise errors.ExecutableNotFound(lilypond_compiler)
+
         # Perform compilation
         try:
             process = Popen(