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Merge pull request #110672 from Profpatsch/lib-add-traceFnSeqN

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lib/debug: add traceFnSeqN
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Silvan Mosberger 2021-01-25 20:17:56 +01:00 committed by GitHub
parent 9ce1caa63c 41e13149f7
commit 9ba1f22982
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2 changed files with 23 additions and 1 deletions
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22
lib/debug.nix
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@ -148,6 +148,28 @@ rec {
/* A combination of `traceVal` and `traceSeqN`. */
traceValSeqN = traceValSeqNFn id;
/* Trace the input and output of a function `f` named `name`,
both down to `depth`.
This is useful for adding around a function call,
to see the before/after of values as they are transformed.
Example:
traceFnSeqN 2 "id" (x: x) { a.b.c = 3; }
trace: { fn = "id"; from = { a.b = {…}; }; to = { a.b = {…}; }; }
=> { a.b.c = 3; }
*/
traceFnSeqN = depth: name: f: v:
let res = f v;
in lib.traceSeqN
(depth + 1)
{
fn = name;
from = v;
to = res;
}
res;
# -- TESTING --

2
lib/default.nix
View file

@ -130,7 +130,7 @@ let
assertMsg assertOneOf;
inherit (self.debug) addErrorContextToAttrs traceIf traceVal traceValFn
traceXMLVal traceXMLValMarked traceSeq traceSeqN traceValSeq
traceValSeqFn traceValSeqN traceValSeqNFn traceShowVal
traceValSeqFn traceValSeqN traceValSeqNFn traceFnSeqN traceShowVal
traceShowValMarked showVal traceCall traceCall2 traceCall3
traceValIfNot runTests testAllTrue traceCallXml attrNamesToStr;
inherit (self.misc) maybeEnv defaultMergeArg defaultMerge foldArgs