resolves asciidoctor#268 provide a human-readable error message when …

…we fail to find Kindlegen
slonopotamus · Jan 26, 2020 · 71e0815 · 71e0815
1 parent 2c48ffd
commit 71e0815
Show file tree

Hide file tree

Showing 2 changed files with 6 additions and 1 deletion.
diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
@@ -8,6 +8,7 @@ For a detailed view of what has changed, refer to the {uri-repo}/commits/master[
 == Unreleased
 
 * make `KINDLEGEN` env var work again (#269)
+* provide a human-readable error message when we fail to find Kindlegen (#268)
 
 == 1.5.0.alpha.11 (2020-01-26) - @slonopotamus
 

diff --git a/lib/asciidoctor-epub3/packager.rb b/lib/asciidoctor-epub3/packager.rb
@@ -619,7 +619,11 @@ def distill_epub_to_mobi epub_file, target, compress
         if !(kindlegen_cmd = ENV['KINDLEGEN']).nil?
           argv = [kindlegen_cmd]
         else
-          require 'kindlegen' unless defined? ::Kindlegen
+          begin
+            require 'kindlegen' unless defined? ::Kindlegen
+          rescue LoadError => e
+            raise 'Unable to find Kindlegen. Either do "gem install kindlegen" or set KINDLEGEN environment variable with path to Kindlegen executable', cause: e
+          end
           argv = [::Kindlegen.command.to_s]
         end
         mobi_file = ::File.basename target.sub(EpubExtensionRx, '.mobi')