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# Gitaly note: JV: not sure what to make of this class. Why does it use
# the full disk path of the repository to look up attributes This is
# problematic in Gitaly, because Gitaly hides the full disk path to the
# repository from gitlab-ce.
module Gitlab
module Git
# Class for parsing Git attribute files and extracting the attributes for
# file patterns.
#
# Unlike Rugged this parser only needs a single IO call (a call to `open`),
# vastly reducing the time spent in extracting attributes.
#
# This class _only_ supports parsing the attributes file located at
# `$GIT_DIR/info/attributes` as GitLab doesn't use any other files
# (`.gitattributes` is copied to this particular path).
#
# Basic usage:
#
# attributes = Gitlab::Git::Attributes.new(some_repo.path)
#
# attributes.attributes('README.md') # => { "eol" => "lf }
class Attributes
# path - The path to the Git repository.
def initialize(path)
@path = File.expand_path(path)
@patterns = nil
end
# Returns all the Git attributes for the given path.
#
# path - A path to a file for which to get the attributes.
#
# Returns a Hash.
def attributes(path)
full_path = File.join(@path, path)
patterns.each do |pattern, attrs|
return attrs if File.fnmatch?(pattern, full_path)
end
{}
end
# Returns a Hash containing the file patterns and their attributes.
def patterns
@patterns ||= parse_file
end
# Parses an attribute string.
#
# These strings can be in the following formats:
#
# text # => { "text" => true }
# -text # => { "text" => false }
# key=value # => { "key" => "value" }
#
# string - The string to parse.
#
# Returns a Hash containing the attributes and their values.
def parse_attributes(string)
values = {}
dash = '-'
equal = '='
binary = 'binary'
string.split(/\s+/).each do |chunk|
# Data such as "foo = bar" should be treated as "foo" and "bar" being
# separate boolean attributes.
next if chunk == equal
key = chunk
# Input: "-foo"
if chunk.start_with?(dash)
key = chunk.byteslice(1, chunk.length - 1)
value = false
# Input: "foo=bar"
elsif chunk.include?(equal)
key, value = chunk.split(equal, 2)
# Input: "foo"
else
value = true
end
values[key] = value
# When the "binary" option is set the "diff" option should be set to
# the inverse. If "diff" is later set it should overwrite the
# automatically set value.
values['diff'] = false if key == binary && value
end
values
end
# Iterates over every line in the attributes file.
def each_line
full_path = File.join(@path, 'info/attributes')
return unless File.exist?(full_path)
File.open(full_path, 'r') do |handle|
handle.each_line do |line|
break unless line.valid_encoding?
yield line.strip
end
end
end
private
# Parses the Git attributes file.
def parse_file
pairs = []
comment = '#'
each_line do |line|
next if line.start_with?(comment) || line.empty?
pattern, attrs = line.split(/\s+/, 2)
parsed = attrs ? parse_attributes(attrs) : {}
pairs << [File.join(@path, pattern), parsed]
end
# Newer entries take precedence over older entries.
pairs.reverse.to_h
end
end
end
end
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