configuration parameters management using environment variables

[delfer]

Based on #45 and improved by claude sonnet 3.7

Key Improvements:
More Efficient Processing:

Updates the file only once instead of for each parameter
Collects new parameters and adds them all at once
Better Error Handling:

Checks if files exist and are writable
Validates critical operations like file copying
Provides meaningful error messages
Improved Pattern Matching:

Handles various formatting styles in the config file
Properly matches parameters regardless of whitespace
Safer File Operations:

Uses temporary files for all operations
Ensures proper cleanup even if errors occur
This improved script should work reliably in all the scenarios you described and is much more robust against potential issues.

[damwiw]

Hi,
I checked the Claude reviewed code. Looks fine, even if I didn't test it.
Some parts could be simplified for the NEW_PARAMS_FILE:
Instead of:

+    # Add to the list of new parameters
+    echo "${param_name}|${value}" >> "${NEW_PARAMS_FILE}"

I would do:

    # Add to the list of new parameters
    echo "${param_name}=${value}" >> "${NEW_PARAMS_FILE}"

Then I would replace:

+if [ -s "${NEW_PARAMS_FILE}" ]; then
+  echo "" >> "${TEMP_FILE}"
+  echo "# Parameters added by environment variables" >> "${TEMP_FILE}"
+
+  while IFS="|" read param_name value; do
+    echo "${param_name}=${value}" >> "${TEMP_FILE}"
+  done < "${NEW_PARAMS_FILE}"
+fi
+
+# Replace the original file with the updated one
+cat "${TEMP_FILE}" > "${CONF_FILE_PATH}"

by:

if [ -s "${NEW_PARAMS_FILE}" ]; then
  echo "" >> "${TEMP_FILE}"
  echo "# Parameters added by environment variables" >> "${TEMP_FILE}"

  cat "${NEW_PARAMS_FILE}" >> "${TEMP_FILE}"
fi

# Replace the original file with the updated one
mv -f "${TEMP_FILE}" "${CONF_FILE_PATH}"