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Add lint for backticks in shell scripts

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The "$(some_command arg1 arg2)" form is preferred to the
`some_command arg1 arg2` form because it nests unambiguously.
Add a lint for this to tidy.
This commit is contained in:
Aneesh Agrawal 2016-08-04 15:16:04 -04:00
parent 4bc629b369
commit 79ef9b4efc
5 changed files with 24 additions and 14 deletions
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27
python/tidy/servo_tidy/tidy.py
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@ -318,19 +318,23 @@ def check_shell(file_name, lines):
shebang = "#!/usr/bin/env bash"
required_options = {"set -o errexit", "set -o nounset", "set -o pipefail"}
did_shebang_check = False
if len(lines) == 0:
yield (0, 'script is an empty file')
else:
if lines[0].rstrip() != shebang:
yield (1, 'script does not have shebang "{}"'.format(shebang))
return
for idx in range(1, len(lines)):
stripped = lines[idx].rstrip()
if lines[0].rstrip() != shebang:
yield (1, 'script does not have shebang "{}"'.format(shebang))
# Comments or blank lines are ignored. (Trailing whitespace is caught with a separate linter.)
if lines[idx].startswith("#") or stripped == "":
continue
elif stripped in required_options:
for idx in range(1, len(lines)):
stripped = lines[idx].rstrip()
# Comments or blank lines are ignored. (Trailing whitespace is caught with a separate linter.)
if lines[idx].startswith("#") or stripped == "":
continue
if not did_shebang_check:
if stripped in required_options:
required_options.remove(stripped)
else:
# The first non-comment, non-whitespace, non-option line is the first "real" line of the script.
@ -338,7 +342,10 @@ def check_shell(file_name, lines):
if len(required_options) != 0:
formatted = ['"{}"'.format(opt) for opt in required_options]
yield (idx + 1, "script is missing options {}".format(", ".join(formatted)))
break
did_shebang_check = True
if "`" in stripped:
yield (idx + 1, "script should not use backticks for command substitution")
def check_rust(file_name, lines):