40 lines
2 KiB
Nix
40 lines
2 KiB
Nix
let lib = import ./default.nix; 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 ${a}" v);
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debugVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
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debugXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
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# this can help debug your code as well - designed to not produce thousands of lines
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traceWhatis = x : __trace (whatis x) x;
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traceMarked = str: x: __trace (str + (whatis x)) x;
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attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${x}=") (__attrNames a));
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whatis = 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 item is : ${whatis (__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 "x is probably a string starting, starting characters: ${__substring 0 50 x}..";
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# trace the arguments passed to function and its result
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traceCall = n : f : a : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a));
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traceCall2 = n : f : a : b : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b));
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traceCall3 = n : f : a : b : c : let t = n2 : x : traceMarked "${n} ${n2}:" x; in t "result" (f (t "arg 1" a) (t "arg 2" b) (t "arg 3" c));
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}
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