fix: prevent KeyError when custom commit_prompt contains curly braces #4766
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Fixes Aider-AI#4719 The get_commit_message function used str.format() to substitute {language_instruction} in the commit prompt. If a user provides a custom --commit-prompt that contains other curly braces like {message}, this causes a KeyError. Changed str.format() to str.replace() to only substitute the specific placeholder without interpreting other curly brace patterns.
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Summary
Fixes #4719
Changed
str.format()tostr.replace()inget_commit_message()to prevent KeyError when custom commit prompts contain curly braces like{message}.Root Cause
The code used:
When custom
--commit-promptcontains{message}or other{placeholder}, Python raises KeyError.Fix
This only substitutes the specific placeholder without interpreting other curly braces.