forked from mirrors/nixpkgs
e06491168b
more consistent naming: debugVal -> traceVal debugXMLVal -> traceXMLVal whatis -> showVal traceWhatis -> traceShowVal traceMarked -> traceShowValMarked removed some parenthesis svn path=/nixpkgs/trunk/; revision=14701
41 lines
2 KiB
Nix
41 lines
2 KiB
Nix
let lib = import ./default.nix; in
|
|
|
|
rec {
|
|
|
|
|
|
# Wrapper aroung the primop `addErrorContext', which shouldn't used
|
|
# directly. It evaluates and returns `val', but if an evaluation
|
|
# error occurs, the text in `msg' is added to the error context
|
|
# (stack trace) printed by Nix.
|
|
addErrorContext =
|
|
if builtins ? addErrorContext
|
|
then builtins.addErrorContext
|
|
else msg: val: val;
|
|
|
|
addErrorContextToAttrs = lib.mapAttrs (a : v : lib.addErrorContext "while evaluating ${a}" v);
|
|
|
|
traceVal = if builtins ? trace then x: (builtins.trace x x) else x: x;
|
|
traceXMLVal = if builtins ? trace then x: (builtins.trace (builtins.toXML x) x) else x: x;
|
|
|
|
# this can help debug your code as well - designed to not produce thousands of lines
|
|
traceShowVal = x : __trace (showVal x) x;
|
|
traceShowValMarked = str: x: __trace (str + showVal x) x;
|
|
attrNamesToStr = a : lib.concatStringsSep "; " (map (x : "${x}=") (__attrNames a));
|
|
showVal = x :
|
|
if __isAttrs x then
|
|
if x ? outPath then "x is a derivation, name ${if x ? name then x.name else "<no name>"}, { ${attrNamesToStr x} }"
|
|
else "x is attr set { ${attrNamesToStr x} }"
|
|
else if __isFunction x then "x is a function"
|
|
else if x == [] then "x is an empty list"
|
|
else if __isList x then "x is a list, first item is : ${showVal (__head x)}"
|
|
else if x == true then "x is boolean true"
|
|
else if x == false then "x is boolean false"
|
|
else if x == null then "x is null"
|
|
else "x is probably a string starting, starting characters: ${__substring 0 50 x}..";
|
|
# trace the arguments passed to function and its result
|
|
traceCall = n : f : a : let t = n2 : x : traceShowValMarked "${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));
|
|
|
|
}
|