mirrors/nixpkgs
1
0
Fork 1
mirror of https://github.com/NixOS/nixpkgs.git synced 2024-11-17 19:21:04 +00:00
Code Issues Wiki Activity

add some debugging functions

Browse source 
traceCallXml is used to trace arguments and result

svn path=/nixpkgs/trunk/; revision=18536
This commit is contained in:
Marc Weber 2009-11-22 21:28:36 +00:00
parent d0cc584711
commit 715d09d836
1 changed files with 49 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

51
pkgs/lib/debug.nix
View file

@ -1,6 +1,9 @@
let lib = import ./default.nix;
inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt isString head substring attrNames;
inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt
isString isBool head substring attrNames;
inherit (lib) all id mapAttrsFlatten;
in
@ -21,7 +24,7 @@ rec {
traceVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
traceXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
traceXMLValMarked = str: if builtins ? trace then x: (builtins.trace ( str + builtins.toXML x) x) else x: x;
# this can help debug your code as well - designed to not produce thousands of lines
traceShowVal = x : trace (showVal x) x;
@ -42,6 +45,7 @@ rec {
else "x is probably a path `${substring 0 50 (toString x)}'";
# trace the arguments passed to function and its result
# maybe rewrite these functions in a traceCallXml like style. Then one function is enough
traceCall = n : f : a : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
traceCall2 = n : f : a : b : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
traceCall3 = n : f : a : b : c : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
@ -61,4 +65,47 @@ rec {
then [ { inherit name; expected = test.expected; result = test.expr; } ]
else [] ) tests));
# evaluate everything once so that errors will occur earlier
# hacky: traverse attrs by adding a dummy
# ignores functions (should this behavior change?) See strictf
#
# Note: This should be a primop! Something like seq of haskell would be nice to
# have as well. It's used fore debugging only anyway
strict = x :
let
traverse = x :
if isString x then true
else if isAttrs x then
if x ? outPath then true
else all id (mapAttrsFlatten (n: traverse) x)
else if isList x then
all id (map traverse x)
else if isBool x then true
else if isFunction x then true
else if isInt x then true
else if x == null then true
else true; # a (store) path?
in if (traverse x) then x else throw "else never reached";
# example: (traceCallXml "myfun" id 3) will output something like
# calling myfun arg 1: 3 result: 3
# this forces deep evaluation of all arguments and the result!
# note: if result doesn't evaluate you'll get no trace at all (FIXME)
# args should be printed in any case
traceCallXml = a:
if !isInt a then
traceCallXml 1 "calling ${a}\n"
else
let nr = a;
in (str: expr:
if isFunction expr then
(arg:
traceCallXml (builtins.add 1 nr) "${str}\n arg ${builtins.toString nr} is \n ${builtins.toXML (strict arg)}" (expr arg)
)
else
let r = strict expr;
in builtins.trace "${str}\n result:\n${builtins.toXML r}" r
);
}