Write debug output to stderr. Optionally print the source filename and line number, or the source of the debug statement. Easily print debug from the middle of call chains.
License: Other
Try using the method_source gem to get the lambda source.
wayne@treebeard:~$ irb
2.1.2 :001 > require 'cute_print'
=> true
2.1.2 :002 > q {1 + 2}
Errno::ENOENT: No such file or directory @ rb_sysopen - (irb)
The gem currently reads the source from a file. With irb, there is no file.
The wrong gem's #d method has special code to make it work with irb. We should probably do what it does.
If source code is modified while it is running, cute_print causes a "Method call not found (RuntimeError)" stack trace.
Run this program
require "cute_print"
loop do
ql {1 + 2}
sleep 1
end
While the program is running, edit it. Comment out the "ql" line and save your edits.
This stack trace results:
...
foo.rb:6: (1 + 2) is 3
foo.rb:6: (1 + 2) is 3
/home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/ruby_parser/method_call.rb:17:in `call?': undefined method `[]' for nil:NilClass (NoMethodError)
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/ruby_parser/method_call.rb:13:in `call_to_method?'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/ruby_parser/parsed_code.rb:24:in `method_call_node'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/ruby_parser/parsed_code.rb:18:in `first_call_to_method'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/source_label.rb:21:in `block_code'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/source_label.rb:13:in `to_s'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/formatter.rb:72:in `join'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/formatter.rb:72:in `make_label'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/formatter.rb:65:in `label'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/formatter.rb:32:in `block in write'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/formatter.rb:31:in `write'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/printer.rb:61:in `ql'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/cute_print.rb:54:in `ql'
from /home/wayne/.rvm/gems/ruby-2.2.0/gems/cute_print-1.0.1/lib/cute_print/mixin.rb:18:in `ql'
from /tmp/foo.rb:6:in `block in <main>'
from /tmp/foo.rb:5:in `loop'
from /tmp/foo.rb:5:in `<main>'
The library prints using #puts. It should use #print, because #puts is not necessarily atomic (it is allowed to write the string and the new-line separately). This can cause jumbled output when multiple threads are printing.
Since q and qq already look like dyslexic version of p and pp you could also have:
object.taq # "tack"
object.taql # "tackle"
Add Kernel#qq. It should work like Kernel#q, but should format the inspected objects like Kernel#pp from the pp (pretty-print) library.
The terminal width is currently hard coded. Instead, detect it.
When tests are run with ruby-2.4.3 or ruby-2.5.0:
/home/wayne/.rvm/gems/ruby-2.5.0/gems/hirb-0.7.3/lib/hirb/helpers/table.rb:254: warning: `+' after local variable or literal is interpreted as binary operator
/home/wayne/.rvm/gems/ruby-2.5.0/gems/hirb-0.7.3/lib/hirb/helpers/table.rb:254: warning: even though it seems like unary operator
These are caused by this expression in ~/.rvm/gems/ruby-2.5.0/gems/hirb-0.7.3/lib/hirb/helpers/:
format_values(@headers).join(' ' + chars[:top][:vertical][:inside] +' ') + | pry-byebug (3.6.0)
' ' + chars[:top][:vertical][:outside] | byebug (~> 10.0)
hirb is no longer maintained. cute_print is using the latest version of hirb, which was released on Jan. 23rd, 2015. cute_print should probably be modified to no longer use hirb. If we need a quick fix, we can monkey-patch hirb.
cute_print evaluates its argument twice. This script:
require "cute_print"
class Foo
include Enumerable
def each
p "each"
end
end
foo = Foo.new
ql {foo.count}
outputs:
"each"
"each"
foo.rb:11: foo.count is 0
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