Skip to content

Add Shell.append_if_missing() helper #39

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
makermelissa merged 1 commit into from
Jun 16, 2026
Merged

Add Shell.append_if_missing() helper #39

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
8 changes: 8 additions & 0 deletions adafruit_shell.py
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -558,6 +558,14 @@ def reconfig(self, file, pattern, replacement):
# Not found; append (silently)
self.write_text_file(file, replacement, append=True)

def append_if_missing(self, file, line):
"""
Append an exact line to a file only if it is not already present.
Equivalent to the shell idiom: grep -qxF "line" file || echo line >> file
"""
if not self.pattern_search(file, "^" + re.escape(line) + "$"):
self.write_text_file(file, line, append=True)

# pylint: disable=too-many-arguments
def pattern_search(
self, location, pattern, multi_line=False, return_match=False, find_all=False
Expand Down
Loading