64 lines
2.9 KiB
Nix
64 lines
2.9 KiB
Nix
let lib = import ./default.nix;
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inherit (builtins) trace attrNamesToStr isAttrs isFunction isList isInt isString head substring attrNames;
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in
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rec {
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# Wrapper aroung the primop `addErrorContext', which shouldn't used
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# directly. It evaluates and returns `val', but if an evaluation
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# error occurs, the text in `msg' is added to the error context
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# (stack trace) printed by Nix.
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addErrorContext =
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if builtins ? addErrorContext
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then builtins.addErrorContext
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else msg: val: val;
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addErrorContextToAttrs = lib.mapAttrs (a : v : lib.addErrorContext "while evaluating ${a}" v);
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traceVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
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traceXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
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# this can help debug your code as well - designed to not produce thousands of lines
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traceShowVal = x : trace (showVal x) x;
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traceShowValMarked = str: x: trace (str + showVal x) x;
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attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${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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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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*/
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runTests = tests: lib.concatLists (lib.attrValues (lib.mapAttrs (name: test:
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if ! lib.eqStrict 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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}
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