Support Perl/CPAN external dependencies

WhoHas requires LWP::UserAgent.

2 files changed, 17 insertions, 1 deletions

diff --git a/Library/Formula/whohas.rb b/Library/Formula/whohas.rb
index 2749555da..336f944a1 100644
--- a/Library/Formula/whohas.rb
+++ b/Library/Formula/whohas.rb
@@ -4,6 +4,8 @@ class Whohas <Formula
   url 'http://www.philippwesche.org/200811/whohas/whohas-0.23.tar.gz'
   homepage 'http://www.philippwesche.org/200811/whohas/intro.html'
   md5 '0895fb6353950fe2e686fa867aaf0416'
+  
+  depends_on 'LWP::UserAgent' => :perl
 
   def install
     bin.install 'program/whohas'
diff --git a/Library/Homebrew/formula_installer.rb b/Library/Homebrew/formula_installer.rb
index efa84e0ff..3c94602e2 100644
--- a/Library/Homebrew/formula_installer.rb
+++ b/Library/Homebrew/formula_installer.rb
@@ -20,6 +20,7 @@ class FormulaInstaller
     end
     deps
   end
+  
   def pyerr dep
     brew_pip = ' brew install pip &&' unless Formula.factory('pip').installed?
     <<-EOS
@@ -30,11 +31,24 @@ Homebrew does not provide formula for Python dependencies, pip does:
 
     EOS
   end
+  def plerr dep; <<-EOS
+Unsatisfied dependency, #{dep}
+Homebrew does not provide formula for Perl dependencies, cpan does:
+
+    cpan -i #{dep}
+  
+    EOS
+  end
 
   def check_external_deps f
+    return unless f.external_deps
+
     f.external_deps[:python].each do |dep|
       raise pyerr(dep) unless quiet_system "/usr/bin/python", "-c", "import #{dep}"
-    end if f.external_deps
+    end
+    f.external_deps[:perl].each do |dep|
+      raise plerr(dep) unless quiet_system "/usr/bin/perl", "-e", "use #{dep}"
+    end
   end
 
   def install f