detached-stash: introduce parse_flags_and_revs function
Introduce parse_flags_and_revs. This function requires that there is at most one stash-like revision parameter and zero or more flags. It knows how to parse -q,--quiet and --index flags, but leaves other flags parsed. Specified revisions are checked to see that they are at least stash-like (meaning: they look like something created by git stash save or git stash create). If this is so, then IS_STASH_LIKE is initialized to a non-empty value. If the specified revision also looks like a stash log entry reference, then IS_STASH_REF is initialized to a non-empty value. References of the form ref@{spec} are required to precisely identify an individual commit. If no reference is specified, stash@{0} is assumed. Once the specified reference is validated to be at least stash_like an ensemble of derived variables, (w_commit, w_tree, b_commit, etc) is initialized with a single call to git rev-parse. Repeated calls to parse_flags_and_rev() avoid repeated calls to git rev-parse if the specified arguments have already been parsed. Subsequent patches in the series modify the existing git stash subcommands to make use of these functions as appropriate. An ensemble of supporting functions that make use of the state established by parse_flags_and_rev(). These are described below: The ancillary functions are: is_stash_like(): which can be used to test whether a specified commit looks like a commit created with git stash save or git stash create. assert_stash_like(): which can be used by commands that misbehave unless their arguments stash-like. is_stash_ref(): which checks whether an argument is valid stash reference(e.g. is of the form ['refs/']stash['@{'something'}]) assert_stash_ref(): which can be used by commands that misbehave unless their arguments are both stash-like and refer to valid stash entries. Signed-off-by: NJon Seymour <jon.seymour@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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