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# Module providing an extract_ref method for controllers working with Git
# tree-ish + path params
#
# Given a string containing both a Git ref - such as a branch or tag - and a
# filesystem path joined by forward slashes, attempts to separate the two.
#
# Expects a @project instance variable to contain the active project. Used to
# check the input against a list of valid repository refs.
#
# Examples
#
# # No @project available
# extract_ref('master')
# # => ['', '']
#
# extract_ref('master')
# # => ['master', '/']
#
# extract_ref("f4b14494ef6abf3d144c28e4af0c20143383e062/CHANGELOG")
# # => ['f4b14494ef6abf3d144c28e4af0c20143383e062', '/CHANGELOG']
#
# extract_ref("v2.0.0/README.md")
# # => ['v2.0.0', '/README.md']
#
# extract_ref('issues/1234/app/models/project.rb')
# # => ['issues/1234', '/app/models/project.rb']
#
# # Given an invalid branch, we fall back to just splitting on the first slash
# extract_ref('non/existent/branch/README.md')
# # => ['non', '/existent/branch/README.md']
#
# Returns an Array where the first value is the tree-ish and the second is the
# path
module RefExtractor
def extract_ref(input)
pair = ['', '']
return pair unless @project
if input.match(/^([[:alnum:]]{40})(.+)/)
# If the ref appears to be a SHA, we're done, just split the string
pair = $~.captures
else
# Append a trailing slash if we only get a ref and no file path
id = input
id += '/' unless id.include?('/')
# Otherwise, attempt to detect the ref using a list of the project's
# branches and tags
valid_refs = @project.branches + @project.tags
valid_refs.select! { |v| id.start_with?("#{v}/") }
if valid_refs.length != 1
# No exact ref match, so just try our best
pair = id.match(/([^\/]+)(.+)/).captures
else
# Partition the string into the ref and the path, ignoring the empty first value
pair = id.partition(valid_refs.first)[1..-1]
end
end
pair
end
end