Preprocessor writes to file (or fails to)

[ghazel]

The C::Preprocessor attempts to write a temp file in the directory where the input file is. This is problematic for system includes where the user does not have permission to write. (i.e. C::Preprocessor.new.preprocess_file('/usr/include/math.h')) Yes, pwd can be set manually, but I can't help thinking it would be better to just send the input data to the compiler over stdin.

That is, if the Preprocessor isn't going to be entirely replaced with ruby code.

[oggy]

Looks to me like it should be writing to the temp directory (it's doing Tempfile.open, which I believes writes to this location).

Are you not seeing this?

[ghazel]

$ irb
1.9.3p286 :001 > require 'cast'
 => true 
1.9.3p286 :002 > C::Preprocessor.new.preprocess_file('/usr/include/math.h')
Errno::ENOENT: No such file or directory - /usr/include/cast-preprocessor-input.20140218-12133-xon498.c.lock
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:346:in `rmdir'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:346:in `rmdir'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:338:in `ensure in locking'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:338:in `locking'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:144:in `block in initialize'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tmpdir.rb:133:in `create'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:134:in `initialize'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:316:in `new'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/tempfile.rb:316:in `open'
    from /Users/ghazel/.rvm/gems/ruby-1.9.3-p286/gems/cast-0.2.1/lib/cast/preprocessor.rb:30:in `preprocess'
    from /Users/ghazel/.rvm/gems/ruby-1.9.3-p286/gems/cast-0.2.1/lib/cast/preprocessor.rb:45:in `block in preprocess_file'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/fileutils.rb:125:in `chdir'
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/lib/ruby/1.9.1/fileutils.rb:125:in `cd'
    from /Users/ghazel/.rvm/gems/ruby-1.9.3-p286/gems/cast-0.2.1/lib/cast/preprocessor.rb:44:in `preprocess_file'
    from (irb):2
    from /Users/ghazel/.rvm/rubies/ruby-1.9.3-p286/bin/irb:16:in `<main>'
1.9.3p286 :003 > 

[oggy]

Ah - got it. Yeah that seems reasonable.