fileset: detect unintentional existing() invocation at runtime A fileset predicate can invoke 'matchctx.existing()' successfully, even if it isn't marked as "existing caller". It is aborted only in some corner cases: e.g. there were one deleted file in the working directory (see 8a0513bf030a for detail). This patch makes 'matchctx.existing()' invocation abort if not '_existingenabled', which is true only while "existing caller" running. After this changes, non-"existing caller" predicate function is aborted immediately, whenever it invokes 'matchctx.existing()'. This prevent developer from forgetting to mark a predicate as "existing caller". BTW, unintentional 'matchctx.status()' invocation can be detected easily without any additional trick like this patch, because it returns 'None' if a predicate isn't marked as "status caller", and referring field (e.g. '.modified') of it is always aborted.

fileset: use set instead of list to mark predicates for efficiency (API) This reduces cost of examining whether given predicate calls 'matchctx.status()' or 'matchctx.existing()' in 'getfileset()' at runtime. This kind of examination is used also in subsequent patch, which detects unintentional 'matchctx.existing()' invocation per each predicate evaluation.

fileset: use decorator to mark a predicate as "existing caller" This can localize changes for adding (or removing) an "existing caller" predicate function in source code.

fileset: use decorator to mark a predicate as "status caller" Before this patch, predicates calling 'matchctx.status()' are listed up by immediate list value in 'getfileset()'. This prevents 3rd party extensions from adding specific predicate calling 'matchctx.status()'. This uses decorator to mark a predicate as "status caller". This can also localize changes for adding (or removing) a "status caller" predicate function in source code.

fileset: use decorator to mark a function as fileset predicate Using decorator can localize changes for adding (or removing) a fileset predicate function in source code. It is also useful to pick predicates up for specific purpose. For example, subsequent patches marks predicates as "call status" or "use existing" via decorator. To avoid (1) redundancy between "predicate name" and (the beginning of) help document, and (2) accidental typo of help document, this patch also makes decorator put predicate declration into the beginning of help.

fileset: treat encoding and eol as the predicate calling _existing Before this patch, predicate function 'encoding' and 'eol' aren't listed up in '_existingcallers', even though they invoke 'existing()'. This causes unexpected failure of these predicate, if there is a (manually) deleted file in the working directory. 8a0513bf030a and 3ce3f2b059a1 seem to overlook putting already existing 'encoding' or newly introduced 'eol' into '_existingcallers'. This patch also changes order of fileset "eol(unix)" output in test, because "existing caller" predicates show "A(dded)" files before "C(lean)" ones.

rebase: mention conflict in documentation instead of merge

rebase: simplify documentation about heads

rebase: simplify documentation about --keep Also include a warning about bookmarks

rebase: simplify documentation about selecting commits to rebase