112 lines
4.7 KiB
Nix
112 lines
4.7 KiB
Nix
let lib = import ./default.nix;
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inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt
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isString isBool head substring attrNames;
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inherit (lib) all id mapAttrsFlatten elem;
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in
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rec {
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inherit (builtins) addErrorContext;
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addErrorContextToAttrs = lib.mapAttrs (a: v: lib.addErrorContext "while evaluating ${a}" v);
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traceVal = x: builtins.trace x x;
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traceXMLVal = x: builtins.trace (builtins.toXML x) x;
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traceXMLValMarked = str: x: builtins.trace (str + builtins.toXML x) x;
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# this can help debug your code as well - designed to not produce thousands of lines
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traceShowVal = x : trace (showVal x) x;
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traceShowValMarked = str: x: trace (str + showVal x) x;
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attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${x}=") (attrNames a));
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showVal = x :
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if isAttrs x then
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if x ? outPath then "x is a derivation, name ${if x ? name then x.name else "<no name>"}, { ${attrNamesToStr x} }"
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else "x is attr set { ${attrNamesToStr x} }"
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else if isFunction x then "x is a function"
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else if x == [] then "x is an empty list"
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else if isList x then "x is a list, first element is: ${showVal (head x)}"
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else if x == true then "x is boolean true"
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else if x == false then "x is boolean false"
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else if x == null then "x is null"
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else if isInt x then "x is an integer `${toString x}'"
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else if isString x then "x is a string `${substring 0 50 x}...'"
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else "x is probably a path `${substring 0 50 (toString x)}...'";
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# trace the arguments passed to function and its result
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# maybe rewrite these functions in a traceCallXml like style. Then one function is enough
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traceCall = n : f : a : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
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traceCall2 = n : f : a : b : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
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traceCall3 = n : f : a : b : c : let t = n2 : x : traceShowValMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
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traceValIfNot = c: x:
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if c x then true else trace (showVal x) false;
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/* Evaluate a set of tests. A test is an attribute set {expr,
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expected}, denoting an expression and its expected result. The
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result is a list of failed tests, each represented as {name,
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expected, actual}, denoting the attribute name of the failing
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test and its expected and actual results. Used for regression
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testing of the functions in lib; see tests.nix for an example.
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Only tests having names starting with "test" are run.
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Add attr { tests = ["testName"]; } to run these test only
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*/
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runTests = tests: lib.concatLists (lib.attrValues (lib.mapAttrs (name: test:
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let testsToRun = if tests ? tests then tests.tests else [];
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in if (substring 0 4 name == "test" || elem name testsToRun)
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&& ((testsToRun == []) || elem name tests.tests)
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&& (test.expr != test.expected)
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then [ { inherit name; expected = test.expected; result = test.expr; } ]
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else [] ) tests));
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# create a test assuming that list elements are true
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# usage: { testX = allTrue [ true ]; }
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testAllTrue = expr : { inherit expr; expected = map (x: true) expr; };
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# evaluate everything once so that errors will occur earlier
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# hacky: traverse attrs by adding a dummy
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# ignores functions (should this behavior change?) See strictf
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#
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# Note: This should be a primop! Something like seq of haskell would be nice to
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# have as well. It's used fore debugging only anyway
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strict = x :
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let
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traverse = x :
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if isString x then true
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else if isAttrs x then
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if x ? outPath then true
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else all id (mapAttrsFlatten (n: traverse) x)
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else if isList x then
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all id (map traverse x)
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else if isBool x then true
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else if isFunction x then true
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else if isInt x then true
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else if x == null then true
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else true; # a (store) path?
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in if traverse x then x else throw "else never reached";
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# example: (traceCallXml "myfun" id 3) will output something like
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# calling myfun arg 1: 3 result: 3
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# this forces deep evaluation of all arguments and the result!
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# note: if result doesn't evaluate you'll get no trace at all (FIXME)
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# args should be printed in any case
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traceCallXml = a:
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if !isInt a then
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traceCallXml 1 "calling ${a}\n"
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else
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let nr = a;
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in (str: expr:
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if isFunction expr then
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(arg:
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traceCallXml (builtins.add 1 nr) "${str}\n arg ${builtins.toString nr} is \n ${builtins.toXML (strict arg)}" (expr arg)
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)
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else
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let r = strict expr;
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in builtins.trace "${str}\n result:\n${builtins.toXML r}" r
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);
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}
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