warning: print file and line of the calling frame

We want to print the calling frame, so we can point out who exactly triggered
it. The current behaviour is less useful (we print the line that called the
warning).

2 files changed, 4 insertions, 6 deletions

diff --git a/lib/pry/warning.rb b/lib/pry/warning.rb
index 6f7bee76..5585ce20 100644
--- a/lib/pry/warning.rb
+++ b/lib/pry/warning.rb
@@ -9,12 +9,12 @@ class Pry
     # @return [void]
     def self.warn(message)
       if Kernel.respond_to?(:caller_locations)
-        location = caller_locations(1..1).first
+        location = caller_locations(2..2).first
         path = location.path
         lineno = location.lineno
       else
         # Ruby 1.9.3 support.
-        frame = caller.first.split(':') # rubocop:disable Performance/Caller
+        frame = caller[1].split(':') # rubocop:disable Performance/Caller
         path = frame.first
         lineno = frame[1]
       end
diff --git a/spec/warning_spec.rb b/spec/warning_spec.rb
index 3f7328ce..18bfa219 100644
--- a/spec/warning_spec.rb
+++ b/spec/warning_spec.rb
@@ -1,9 +1,7 @@
 RSpec.describe Pry::Warning do
   describe "#warn" do
-    it "prints a warning with file and line" do
-      expect(Kernel).to receive(:warn).with(
-        "#{__FILE__}:#{__LINE__ + 2}: warning: foo bar"
-      )
+    it "prints message with file and line of the calling frame" do
+      expect(Kernel).to receive(:warn).with(/.+\.rb:\d+: warning: foo bar/)
       described_class.warn('foo bar')
     end
   end