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Limit scope of modeline search (#2967)

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Only matches the first and last 5 lines against the modeline regular expressions
This commit is contained in:
Paul Chaignon
2016-05-05 17:33:40 +02:00
committed by Arfon Smith
parent 9ae19a1f94
commit 5c19f1f546
3 changed files with 405 additions and 1 deletions
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8
lib/linguist/strategy/modeline.rb
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@@ -15,6 +15,10 @@ module Linguist
MODELINES = [EMACS_MODELINE, VIM_MODELINE_1, VIM_MODELINE_2]
# Scope of the search for modelines
# Number of lines to check at the beginning and at the end of the file
SEARCH_SCOPE = 5
# Public: Detects language based on Vim and Emacs modelines
#
# blob - An object that quacks like a blob.
@@ -26,7 +30,9 @@ module Linguist
# Returns an Array with one Language if the blob has a Vim or Emacs modeline
# that matches a Language name or alias. Returns an empty array if no match.
def self.call(blob, _ = nil)
Array(Language.find_by_alias(modeline(blob.data)))
header = blob.lines.first(SEARCH_SCOPE).join("\n")
footer = blob.lines.last(SEARCH_SCOPE).join("\n")
Array(Language.find_by_alias(modeline(header + footer)))
end
# Public: Get the modeline from the first n-lines of the file