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| etxuwig at etxb.ericsson. |
 Posted: Thu Apr 17, 2003 3:19 pm |
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Guest
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I've been playing around with packages in Erlang for a
while, and must say that it happens annoyingly often that I
forget to insert 'import' clauses for OTP modules that I
want to use.
The standard Erlang problem of calling undefined external
functions is usually not a very big one, IMHO, but it
becomes decidedly more common with packages due to the
legacy treatment of "the empty package".
A suggestion: if a module with a package name is compiled,
the linter could issue a warning if an implicitly named
module is not found in the 'outdir'.
It's not difficult to order modules in the Makefile so that
compilation is done in dependency order; this has to be done
anyway if one defines custom behaviours or parse transforms
(I know, that doesn't happen every day.)
I've attached a suggested patch to erl_lint.erl.
Given the following test module (test.erl):
-module(mypackage.test).
-export([foo/0]).
%% forgotten -import(lists).
foo() ->
lists:foldl(fun(X,A) -> [X|A] end, [], [a,b,c]).
1> compile:file(test,[{outdir,"../ebin"},return_warnings]).
{ok,'mypackage.test',
[{"./test.erl",[{7,erl_lint,{maybe_missing_import,"lists"}}]}]}
42> compile:file(test,[{outdir,"../ebin"},report_warnings]).
./test.erl:7: Warning: Missing import for module lists
{ok,'mypackage.test'}
/Uffe
--
Ulf Wiger, Senior Specialist,
/ / / Architecture & Design of Carrier-Class Software
/ / / Strategic Product & System Management
/ / / Ericsson AB, Connectivity and Control Nodes
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