dirstate-tree: Make `DirstateMap` borrow from a bytes buffer
… that has the contents of the `.hg/dirstate` file.
This only applies to the tree-based flavor of `DirstateMap`.
For now only the entire `&[u8]` slice is stored, so this is not useful yet.
Adding a lifetime parameter to the `DirstateMap` struct (in hg-core) makes
Python bindings non-trivial because we keep that struct in a Python object
that has a dynamic lifetime tied to Python’s reference-counting and GC.
As long as we keep the `PyBytes` that owns the borrowed bytes buffer next to
the borrowing struct, the buffer will live long enough for the borrows to stay
valid. However this relationship cannot be expressed in safe Rust code in a
way that would statisfy they borrow-checker. We use `unsafe` code to erase
that lifetime parameter, and encapsulate it in a safe abstraction similar to
the owning-ref crate: https://docs.rs/owning_ref/
Differential Revision: https://phab.mercurial-scm.org/D10557
$ cat >> $HGRCPATH << EOF
> [extensions]
> show =
> EOF
No arguments shows available views
$ hg init empty
$ cd empty
$ hg show
available views:
bookmarks -- bookmarks and their associated changeset
stack -- current line of work
work -- changesets that aren't finished
abort: no view requested
(use "hg show VIEW" to choose a view)
[255]
`hg help show` prints available views
$ hg help show
hg show VIEW
show various repository information
A requested view of repository data is displayed.
If no view is requested, the list of available views is shown and the
command aborts.
Note:
There are no backwards compatibility guarantees for the output of this
command. Output may change in any future Mercurial release.
Consumers wanting stable command output should specify a template via
"-T/--template".
List of available views:
bookmarks bookmarks and their associated changeset
stack current line of work
work changesets that aren't finished
(use 'hg help -e show' to show help for the show extension)
options:
-T --template TEMPLATE display with template
(some details hidden, use --verbose to show complete help)
Unknown view prints error
$ hg show badview
abort: unknown view: badview
(run "hg show" to see available views)
[255]
HGPLAIN results in abort
$ HGPLAIN=1 hg show bookmarks
abort: must specify a template in plain mode
(invoke with -T/--template to control output format)
[255]
But not if a template is specified
$ HGPLAIN=1 hg show bookmarks -T '{bookmark}\n'
(no bookmarks set)
$ cd ..
bookmarks view with no bookmarks prints empty message
$ hg init books
$ cd books
$ touch f0
$ hg -q commit -A -m initial
$ hg show bookmarks
(no bookmarks set)
bookmarks view shows bookmarks in an aligned table
$ echo book1 > f0
$ hg commit -m 'commit for book1'
$ echo book2 > f0
$ hg commit -m 'commit for book2'
$ hg bookmark -r 1 book1
$ hg bookmark a-longer-bookmark
$ hg show bookmarks
* a-longer-bookmark 7b57
book1 b757
A custom bookmarks template works
$ hg show bookmarks -T '{node} {bookmark} {active}\n'
7b5709ab64cbc34da9b4367b64afff47f2c4ee83 a-longer-bookmark True
b757f780b8ffd71267c6ccb32e0882d9d32a8cc0 book1 False
bookmarks JSON works
$ hg show bookmarks -T json
[
{
"active": true,
"bookmark": "a-longer-bookmark",
"longestbookmarklen": 17,
"node": "7b5709ab64cbc34da9b4367b64afff47f2c4ee83",
"nodelen": 4
},
{
"active": false,
"bookmark": "book1",
"longestbookmarklen": 17,
"node": "b757f780b8ffd71267c6ccb32e0882d9d32a8cc0",
"nodelen": 4
}
]
JSON works with no bookmarks
$ hg book -d a-longer-bookmark
$ hg book -d book1
$ hg show bookmarks -T json
[
]
commands.show.aliasprefix aliases values to `show <view>`
$ hg --config commands.show.aliasprefix=s sbookmarks
(no bookmarks set)
$ hg --config commands.show.aliasprefix=sh shwork
@ 7b57 commit for book2
o b757 commit for book1
o ba59 initial
$ hg --config commands.show.aliasprefix='s sh' swork
@ 7b57 commit for book2
o b757 commit for book1
o ba59 initial
$ hg --config commands.show.aliasprefix='s sh' shwork
@ 7b57 commit for book2
o b757 commit for book1
o ba59 initial
The aliases don't appear in `hg config`
$ hg --config commands.show.aliasprefix=s config alias
[1]
Doesn't overwrite existing alias
$ hg --config alias.swork='log -r .' --config commands.show.aliasprefix=s swork
changeset: 2:7b5709ab64cb
tag: tip
user: test
date: Thu Jan 01 00:00:00 1970 +0000
summary: commit for book2
$ hg --config alias.swork='log -r .' --config commands.show.aliasprefix=s config alias
alias.swork=log -r .
$ cd ..