revset: introduce new operator "##" to concatenate strings/symbols at runtime
Before this patch, there is no way to concatenate strings at runtime.
For example, to search for the issue ID "1234" in descriptions against
all of "issue 1234", "issue:1234", issue1234" and "bug(1234)"
patterns, the revset below should be written fully from scratch for
each issue ID.
grep(r"\bissue[ :]?1234\b|\bbug\(1234\)")
This patch introduces new infix operator "##" to concatenate
strings/symbols at runtime. Operator symbol "##" comes from the same
one of C pre-processor. This concatenation allows parametrizing a part
of strings in revset queries.
In the case of example above, the definition of the revset alias using
operator "##" below can search issue ID "1234" in complicated patterns
by "issue(1234)" simply:
issue($1) = grep(r"\bissue[ :]?" ## $1 ## r"\b|\bbug\(" ## $1 ## r"\)")
"##" operator does:
- concatenate not only strings but also symbols into the string
Exact distinction between strings and symbols seems not to be
convenience, because it is tiresome for users (and
"revset.getstring" treats both similarly)
For example of revset alias "issue()", "issue(1234)" is easier
than "issue('1234')".
- have higher priority than any other prefix, infix and postfix
operators (like as "##" of C pre-processor)
This patch (re-)assigns the priority 20 to "##", and 21 to "(",
because priority 19 is already assigned to "-" as prefix "negate".
$ hg init
$ echo foo > foo
$ echo bar > bar
$ hg ci -qAm 'add foo bar'
$ echo foo2 >> foo
$ echo bleh > bar
$ hg ci -m 'change foo bar'
$ hg up -qC 0
$ hg mv foo foo1
$ echo foo1 > foo1
$ hg cat foo >> foo1
$ hg ci -m 'mv foo foo1'
created new head
$ hg merge
merging foo1 and foo to foo1
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ hg debugstate --nodates
m 0 -2 bar
m 0 -2 foo1
copy: foo -> foo1
$ hg st -q
M bar
M foo1
Removing foo1 and bar:
$ cp foo1 F
$ cp bar B
$ hg rm -f foo1 bar
$ hg debugstate --nodates
r 0 -1 bar
r 0 -1 foo1
copy: foo -> foo1
$ hg st -qC
R bar
R foo1
Re-adding foo1 and bar:
$ cp F foo1
$ cp B bar
$ hg add -v foo1 bar
adding bar
adding foo1
$ hg debugstate --nodates
n 0 -2 bar
n 0 -2 foo1
copy: foo -> foo1
$ hg st -qC
M bar
M foo1
foo
Reverting foo1 and bar:
$ hg revert -vr . foo1 bar
saving current version of bar as bar.orig
reverting bar
saving current version of foo1 as foo1.orig
reverting foo1
$ hg debugstate --nodates
n 0 -2 bar
n 0 -2 foo1
copy: foo -> foo1
$ hg st -qC
M bar
M foo1
foo
$ hg diff
Merge should not overwrite local file that is untracked after remove
$ rm *
$ hg up -qC
$ hg rm bar
$ hg ci -m 'remove bar'
$ echo 'memories of buried pirate treasure' > bar
$ hg merge
bar: untracked file differs
abort: untracked files in working directory differ from files in requested revision
[255]
$ cat bar
memories of buried pirate treasure
Those who use force will lose
$ hg merge -f
remote changed bar which local deleted
use (c)hanged version or leave (d)eleted? c
merging foo1 and foo to foo1
1 files updated, 1 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)
$ cat bar
bleh
$ hg st
M bar
M foo1