This can be used to flatten nested "if()"s. It's not exactly the same as "case"
or "switch" expression, but works reasonably well in template. It's not uncommon
to show placeholder text in place of an empty content, and a nullish value
(e.g. empty string, list, option) is usually rendered as an empty text.
A formatted error is not a string containing ANSI escape sequences because 1.
the output may be differently colored inside "hint", 2. the caller might not
be accessible to ui.new_formatter().
Highlighting "{n}: " will help to follow error sources containing multi-line
messages. I'm going to make revset/template alias errors be formatted as plain
error chain.
It's inconsistent that some warnings have headings and some don't, and it seems
the choice is arbitrary. Let's unify the style. There are two exceptions:
1. continued line following labeled message,
2. "unrecognized response" followed by prompt.
The lowercase "warning: " is unified to "Warning: " as it is the jj's
convention afaik.
The _default() suffix could be dropped from these methods, but it's probably
better to break the existing codebase for the moment. Otherwise, the caller
might do writeln!(ui.warning(), "Warning: ..").
The existing .hint() method is renamed to .hint_no_heading() to clarify that
it's not the default choice to print a hint. I'll add .hint_default() later,
which will be the shorthand for .hint_with_heading("Hint: ").
This will be used to label "Error: " heading and content differently. I want
to see an error message in the default (white) color because it's easier to
read, but I still want to highlight the "Error: " heading.
We can achieve that without introducing new wrapper, but the resulting code
would look something like "writeln!(ui.error("Error: ")?, ..)?", and it would
get messier if the caller had to suppress io::Error.
I don't think we have any callers left that call
`record_rewritten_commit()` multiple times within a transaction and
expect it to result in divergence. I think we should consider it a bug
to do that.
I'm going to introduce two changes: 1. indent commit summary, 2. colorize
output. The former can be implemented without using the templater API, but the
latter can't.
IntoTemplate will be cleaned up later. Perhaps, the lifetime parameter can be
removed at this point, but I'm planning to remove the IntoTemplate trait at all.
The type parameter 'C' will be removed from the Template trait, making it
represent a printable type or compiled template.
TemplateRenderer now holds Box<dyn _> template because it's unlikely that the
inner template type can be statically determined.
This fixes --change/--branch conflicts by making --change precede --branch. I
don't think this is the most obvious behavior, but it's the easiest workaround.
It could be moved before set_local_branch_target() to not update the local
branch, but it seemed weird that --change is silently ignored. This
inconsistency will be addressed later.
This helps to implement CommandError::add_hint(). The inner errors could be
embedded in the enum as before, but they're mostly of the same type. And I think
it's okay to use downcast_ref() to deal with the clap::Error special case.
I'm going to reorganize CommandError as (kind, err, hints) tuple so that we
can add_hint() to the constructed error object.
Some config error messages are slightly adjusted because the inner error is
now printed in separate line.
I think Option<Commit> is the simplest encoding of the log node.
The behavior of an Option type is closer to nullable types rather than the
Option in Rust. I don't think we would want to write opt.map(|x| x.f()) or
opt.unwrap().f(). We can of course add opt?.f() syntax, but it will be a short
for "if(opt, opt.f())"?
As requested in #1471, I added a new flag for `jj branch list` to only show branches that are conflicted.
Adds a unit test to check for listing only conflicted branches and regenerates the cli output to incorporate the new flag.
Closes#1471
reformat
These two are common when implementing methods. Fortunately, the
"return-position impl Trait in traits" feature is stabilized in Rust 1.75.0,
so we don't need another variant of TemplateFunction.
Apart from (IMO) looking nicer, this will also sidestep the potential problem
that if the file contains actual jj conflict markers (`>>>>>>>` in the beginning
of a line, for example), jj would currently have trouble materializing and
subsequently parsing conflicts in the file if it actually became conflicted.
I'll demo this bug in either this or a subsequent PR. It's the kind of bug that
sounds serious in theory but might never cause a problem in practice.
After this PR, only `docs/tutorial.md` has a conflict marker that's not indented.
There's only one there, so hopefully it won't be too much of a pain to deal with.
I also indented other strings in `test_conflicts.rs`. IMO, this looks nice and
more consistent with the `insta::assert_snapshot` output. I didn't spend the
time to do the same for `test_resolve_command`.
Now a compiled template doesn't have a static Context type internally. A
property is basically of "Fn() -> Result<O, _>" type, and a type-erased "self"
variable will be injected as needed.
Template<C> types will be refactored separately.
In short, this enables compilation of template of e.g. Vec<Commit> type by
using CommitTemplateLanguage.
A Template<C> was originally compiled for a specific type C, and invoked as
"Fn(&C) -> _". It was simple and intuitive, but we had to define the context
type C statically. Things got even worse by extensions support because we had
to provide object-safe hook point for each context type C.
This patch basically removes the Context type from compiled templates. The
"self" variable is injected through RefCell<Option<C>> placeholder. A compiled
template knows its "self" type, but the type can be decided per instance, not
per TemplateLanguage type. A drawback is that the "self" variable will have to
be cloned one more time.
The Template<C> abstraction no longer makes sense, and will be split to inner
Template<()> implementations (which usually represent printable types) and the
outer Template<C>.
The idea is basically the same as list.map(|x| ...) template. It compiles the
inner template with a placeholder variable of type 'C', and evaluate it for
each instance variable by injecting the variable through RefCell.
