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lib/strings: Add floatToString

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Silvan Mosberger 2020-03-07 02:44:56 +01:00
parent f1bc04254b
commit 5ae3fb2c38
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lib/strings.nix
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@ -612,6 +612,22 @@ rec {
*/ */
fixedWidthNumber = width: n: fixedWidthString width "0" (toString n); fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
/* Convert a float to a string, but emit a warning when precision is lost
during the conversion
Example:
floatToString 0.000001
=> "0.000001"
floatToString 0.0000001
=> trace: warning: Imprecise conversion from float to string 0.000000
"0.000000"
*/
floatToString = float: let
result = toString float;
precise = float == builtins.fromJSON result;
in if precise then result
else lib.warn "Imprecise conversion from float to string ${result}" result;
/* Check whether a value can be coerced to a string */ /* Check whether a value can be coerced to a string */
isCoercibleToString = x: isCoercibleToString = x:
builtins.elem (builtins.typeOf x) [ "path" "string" "null" "int" "float" "bool" ] || builtins.elem (builtins.typeOf x) [ "path" "string" "null" "int" "float" "bool" ] ||