[erlang-questions] where did my code come from?
Tue Sep 13 09:19:13 CEST 2011
I had an idea on my way to work ...
When you write code, you have *implicit* knowledge of where the
external code comes from.
When I write the following:
X = lists:reverse(...),
Y = elib1_misc:zap(...)
Z = misultin:request(...)
I "know" that lists is part of my local OTP install, elib1_misc is my
own library installed
in ~/code/elib2_1/ebin and misultin is an imported project stored in
I also know that my paths etc are setup so this code will work when I
run the program.
The problem is the *nobody else* knows this.
I could tell the system like this:
The location annotation give a *definitive source" for the module I
am using in the module
What could you do with this information?
Answer - a lot - for starters
- automatically check for "latest versions" of libraries
download them when they change
- provide "who uses my code" feedback to the authors of the code
- publish (globally) lists of "definitive" versions of code
- recursive track and code dependencies (What do I mean)
when my system discovers that I use misultin - it
misultin.erl will have location dependencies which I can
follow, thus the libraries
that misultin calls can be fetched.
- automate code loading
Most often this kind of "additional" information is kept "outside
the program" by strictly
annotating the program with the location dependencies we bring this
information *into* the program
in a form where it cannot be detached from the source code.
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