Francis Moreau wrote:
> To get the commit set which can't be reached by master (ie commits
> which are specific to branches other than master) I would do:
>
> # "$@" is the range spec passed to the script
> git rev-list "$@" ^master | check_other_commit
>
> But I don't know if it's possible to use a different git-rev-list
> command to get the rest of the commits, ie the ones that are reachable
> by the specified range and master.
>
> One way to do that is to record the first commit set got by the first
> rev-list command and check that the ones returned by "git rev-list $@"
> are not in the record.
I don't fully understand your query, because almost anything is
possible with rev-list:
$ git rev-list foo..bar master # reachable from master, bar, not foo
What I _suspect_ you're asking is for help when you can't construct
this "foo..bar master" programmatically (or when you cannot express
your criterion as arguments to rev-list). You want an initial commit
set, and filter it at various points in your program using various
criteria, right? In that case, I'd suggest something like this:
# Returns a list of commits given a committish that `rev-list`
# accepts.
def self.list_commits(committish)
commits = []
revlist = execute("git", "rev-list", "--reverse", "--date-order",
"--simplify-merges", committish).chomp.split("\n")
# do it in batches of 1000 commits
while revlist
these_revs = revlist.first(1000).join("\n")
this_chunk = execute({ :in => these_revs }, "git",
"cat-file", "--batch")
# parse_cat_file parses the chunk and updates @commit_index
parse_cat_file(this_chunk) { |struct| commits << struct }
revlist = revlist[1000 .. revlist.length - 1]
end
return commits
end
# Filters a list of commits with the precondition that it exists
# in the committish. :sha1 is used to uniquely identify a commit.
def self.filter_commits(commits, committish)
revlist = execute("git", "rev-list", "--simplify-merges",
committish).split("\n")
allowed_commits = revlist.map { |sha1| @commit_index[sha1.hex] }
return commits & allowed_commits
end
In essence, I use '&' to filter and it's extremely fast. The trick is
to shell out to git sparingly, store the data you get in a sensible
manner, and build fast custom filters based on what you want. Here
are a few more examples:
# Filters a list of commits with the precondition that it is a
# first-parent commit in a given committish.
def self.filter_fp_commits(commits, committish)
revlist = execute("git", "rev-list", "--first-parent",
"--simplify-merges", committish).split("\n")
allowed_commits = revlist.map { |sha1| @commit_index[sha1.hex] }
return commits & allowed_commits
end
# Slice a list of commits using a start_hex and end_hex, which
# may both be nil.
def self.slice_commits(commits, start_commit, end_commit)
start_idx = commits.index(start_commit)
end_idx = commits.index(end_commit)
start_idx = 0 if start_idx.nil?
end_idx = commits.size - 1 if end_idx.nil?
return commits[start_idx..end_idx]
end
def self.filter_commits_tree_path(commits, path)
commit_chunk = (commits.map { |commit| commit.sha1 }).join("\n")
commit_chunk = "#{commit_chunk}\n"
diff_tree_chunk = execute({ :in => commit_chunk }, "git", "diff-tree", \
"-m", "-r", "-s", "--stdin", path)
matching_sha1s = diff_tree_chunk.split("\n")
allowed_commits = matching_sha1s.map { |sha1| @commit_index[sha1.hex] }
return commits & allowed_commits
end
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