Create a stub implementation

This implementation is designed to allow people to start using this
package in other projects. The Revise integration will come later.

Author: timholy

Project.toml

@@ -1,5 +1,5 @@
 name = "CodeTracking"
-uuid = "e566d876-1fe1-11e9-33c3-297fb9d9bdc3"
+uuid = "da1fd8a2-8d9e-5ec2-8556-3022fb5608a2"
 authors = ["Tim Holy <[email protected]>"]
 version = "0.1.0"
 

README.md

@@ -1 +1,20 @@
 # CodeTracking
+
+CodeTracking is a minimal package designed to work with (a future version of)
+[Revise.jl](https://github.com/timholy/Revise.jl).
+Its main purpose is to allow packages that need to know the location
+(file and line number) of code that might move around as it's edited.
+
+CodeTracking is a very lightweight dependency.
+
+Demo:
+
+```julia
+julia> using CodeTracking
+
+julia> m = @which sum([1,2,3])
+sum(a::AbstractArray) in Base at reducedim.jl:648
+
+julia> file, line = whereis(m)
+("/home/tim/src/julia-1/usr/share/julia/base/reducedim.jl", 648)
+```

src/CodeTracking.jl

@@ -1,5 +1,15 @@
 module CodeTracking
 
-greet() = print("Hello World!")
+export whereis
+
+# This is just a stub implementation for now
+function whereis(method::Method)
+    file, line = String(method.file), method.line
+    if !isabspath(file)
+        # This is a Base method
+        file = Base.find_source_file(file)
+    end
+    return normpath(file), line
+end
 
 end # module