This is gated behind the `debug` feature flag so only explicit debugging
cases pay the build time and runtime costs.
The builder API's stack traces are generally not too interesting. Where
this really helps is with `clap_derive`. We currently panic on
unexpected conditions which at least gives us a backtrace. We'd like to
turn these into errors but to do so would lose those debuggin
backtraces, which is where this comes in.
This is a part of #2255
This removes the direct dependency on unicode-width and delegates the
complexity of computing the displayed width of text to the Textwrap
crate.
The `display_width` function handles characters like “æøå” (Danish),
“äöü” (German), and “😂✨😍” (emojis) – even if the unicode-width
Cargo feature is disabled.
This is an improvement of the former `str_width` function which would
over-estimate the width of emojis and non-ASCII characters (since they
are several bytes wide).
This commit introduces a new feature called `"regex"`. It adds a new
function `validator_regex` to `Arg` and was inspired by the discussion
in #1968. The name `validator_regex` was chosen instead of
`regex_validator` to make sure that the developer keeps in mind that
there may only be a single `Validator` on an `Arg`.
The feature can be used with YAML files, however there is no proper
pattern in `clap_app!` (yet).
1664: Import structopt r=pksunkara a=CreepySkeleton
OK, here is about 50% of what's left to import.
`impl StructOpt for Box<impl StructOpt>` is not imported because layouts of `StructOpt` and `Clap` are too different. I'll work it out after the import is done.
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Co-authored-by: CreepySkeleton <creepy-skeleton@yandex.ru>
Co-authored-by: Cecile Tonglet <cecile.tonglet@cecton.com>
Co-authored-by: David McNeil <mcneil.david2@gmail.com>
