pathspec: allow escaped query values
In our own .gitattributes file we have attributes such as: *.[ch] whitespace=indent,trail,space When querying for attributes we want to be able to ask for the exact value, i.e. git ls-files :(attr:whitespace=indent,trail,space) should work, but the commas are used in the attr magic to introduce the next attr, such that this query currently fails with fatal: Invalid pathspec magic 'trail' in ':(attr:whitespace=indent,trail,space)' This change allows escaping characters by a backslash, such that the query git ls-files :(attr:whitespace=indent\,trail\,space) will match all path that have the value "indent,trail,space" for the whitespace attribute. To accomplish this, we need to modify two places. First `parse_long_magic` needs to not stop early upon seeing a comma or closing paren that is escaped. As a second step we need to remove any escaping from the attr value. Based on a patch by Stefan Beller <sbeller@google.com> Signed-off-by: NBrandon Williams <bmwill@google.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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