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Add lint for backticks in shell scripts
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.
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5 changed files with 24 additions and 14 deletions
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@ -318,19 +318,23 @@ def check_shell(file_name, lines):
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shebang = "#!/usr/bin/env bash"
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required_options = {"set -o errexit", "set -o nounset", "set -o pipefail"}
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did_shebang_check = False
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if len(lines) == 0:
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yield (0, 'script is an empty file')
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else:
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if lines[0].rstrip() != shebang:
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yield (1, 'script does not have shebang "{}"'.format(shebang))
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return
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for idx in range(1, len(lines)):
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stripped = lines[idx].rstrip()
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if lines[0].rstrip() != shebang:
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yield (1, 'script does not have shebang "{}"'.format(shebang))
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# Comments or blank lines are ignored. (Trailing whitespace is caught with a separate linter.)
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if lines[idx].startswith("#") or stripped == "":
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continue
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elif stripped in required_options:
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for idx in range(1, len(lines)):
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stripped = lines[idx].rstrip()
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# Comments or blank lines are ignored. (Trailing whitespace is caught with a separate linter.)
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if lines[idx].startswith("#") or stripped == "":
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continue
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if not did_shebang_check:
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if stripped in required_options:
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required_options.remove(stripped)
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else:
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# The first non-comment, non-whitespace, non-option line is the first "real" line of the script.
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@ -338,7 +342,10 @@ def check_shell(file_name, lines):
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if len(required_options) != 0:
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formatted = ['"{}"'.format(opt) for opt in required_options]
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yield (idx + 1, "script is missing options {}".format(", ".join(formatted)))
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break
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did_shebang_check = True
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if "`" in stripped:
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yield (idx + 1, "script should not use backticks for command substitution")
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def check_rust(file_name, lines):
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