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Add 'fixedWidthString' and 'fixedWidthNumber' formatting functions

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This commit is contained in:
Nikita Mikhailov 2015-03-08 18:29:14 +01:00
parent 32ee876647
commit 63ae447a0f
1 changed files with 11 additions and 0 deletions
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11
lib/strings.nix
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@ -208,4 +208,15 @@ rec {
# standard GNU Autoconf scripts. # standard GNU Autoconf scripts.
enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}"; enableFeature = enable: feat: "--${if enable then "enable" else "disable"}-${feat}";
# Create a fixed width string with additional prefix to match required width
fixedWidthString = width: filler: str:
let
strw = lib.stringLength str;
reqWidth = width - (lib.stringLength filler);
in
assert strw <= width;
if strw == width then str else filler + fixedWidthString reqWidth filler str;
# Format a number adding leading zeroes up to fixed width
fixedWidthNumber = width: n: fixedWidthString width "0" (toString n);
} }