mirror of
https://github.com/privatevoid-net/nix-super.git
synced 2024-11-28 16:46:16 +02:00
0fa08b4516
Previously, there were two mostly-identical value printers -- one in `libexpr/eval.cc` (which didn't force values) and one in `libcmd/repl.cc` (which did force values and also printed ANSI color codes). This PR unifies both of these printers into `print.cc` and provides a `PrintOptions` struct for controlling the output, which allows for toggling whether values are forced, whether repeated values are tracked, and whether ANSI color codes are displayed. Additionally, `PrintOptions` allows tuning the maximum number of attributes, list items, and bytes in a string that will be displayed; this makes it ideal for contexts where printing too much output (e.g. all of Nixpkgs) is distracting. (As requested by @roberth in https://github.com/NixOS/nix/pull/9554#issuecomment-1845095735) Please read the tests for example output. Future work: - It would be nice to provide this function as a builtin, perhaps `builtins.toStringDebug` -- a printing function that never fails would be useful when debugging Nix code. - It would be nice to support customizing `PrintOptions` members on the command line, e.g. `--option to-string-max-attrs 1000`.
18 lines
318 B
C++
18 lines
318 B
C++
#include "english.hh"
|
|
|
|
namespace nix {
|
|
|
|
std::ostream & pluralize(
|
|
std::ostream & output,
|
|
unsigned int count,
|
|
const std::string_view single,
|
|
const std::string_view plural)
|
|
{
|
|
if (count == 1)
|
|
output << "1 " << single;
|
|
else
|
|
output << count << " " << plural;
|
|
return output;
|
|
}
|
|
|
|
}
|