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Improve find leading flag detection (fixes #1312)

This commit is contained in:
Vidar Holen 2018-08-26 18:18:57 -07:00
parent d02a9bbcce
commit 488d6dcb41
1 changed files with 7 additions and 4 deletions
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11
src/ShellCheck/Checks/Commands.hs
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@ -684,20 +684,23 @@ prop_checkFindWithoutPath4 = verifyNot checkFindWithoutPath "find -H -L \"$path\
prop_checkFindWithoutPath5 = verifyNot checkFindWithoutPath "find -O3 ."
prop_checkFindWithoutPath6 = verifyNot checkFindWithoutPath "find -D exec ."
prop_checkFindWithoutPath7 = verifyNot checkFindWithoutPath "find --help"
prop_checkFindWithoutPath8 = verifyNot checkFindWithoutPath "find -Hx . -print"
checkFindWithoutPath = CommandCheck (Basename "find") f
where
f t@(T_SimpleCommand _ _ (cmd:args)) =
unless (t `hasFlag` "help" || hasPath args) $
info (getId cmd) 2185 "Some finds don't have a default path. Specify '.' explicitly."
-- This is a bit of a kludge. find supports flag arguments both before and after the path,
-- as well as multiple non-flag arguments that are not the path. We assume that all the
-- pre-path flags are single characters, which is generally the case except for -O3.
-- This is a bit of a kludge. find supports flag arguments both before and
-- after the path, as well as multiple non-flag arguments that are not the
-- path. We assume that all the pre-path flags are single characters from a
-- list of GNU and macOS flags.
hasPath (first:rest) =
let flag = fromJust $ getLiteralStringExt (const $ return "___") first in
not ("-" `isPrefixOf` flag) || isLeadingFlag flag && hasPath rest
hasPath [] = False
isLeadingFlag flag = length flag <= 2 || "-O" `isPrefixOf` flag
isLeadingFlag flag = length flag <= 2 || all (`elem` leadingFlagChars) flag
leadingFlagChars="-EHLPXdfsxO0123456789"
prop_checkTimeParameters1 = verify checkTimeParameters "time -f lol sleep 10"