Allow callable references in sqlite-utils convert, closes #686

[simonw]

• Idea: sqlite-utils convert my.db articles created_at r.parsedate #686

This allows users to pass just a callable reference like r.parsedate
instead of r.parsedate(value) to the convert command. The code now
detects when the input evaluates to a callable and uses it directly.

Examples that now work:

• sqlite-utils convert my.db table col r.parsedate
• sqlite-utils convert my.db table col json.loads --import json

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📚 Documentation preview 📚: https://sqlite-utils--690.org.readthedocs.build/en/690/

Claude Code for web prompt (I literally just pasted in the URL to the issue):

https://github.com/simonw/sqlite-utils/issues/686

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.34%. Comparing base (f9e5fbb) to head (29b0722).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #690   +/-   ##
=======================================
  Coverage   95.33%   95.34%           
=======================================
  Files           8        8           
  Lines        3001     3007    +6     
=======================================
+ Hits         2861     2867    +6     
  Misses        140      140           

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[simonw]

Documented here: https://sqlite-utils--690.org.readthedocs.build/en/690/cli.html#sqlite-utils-convert-recipes

[simonw]

Manually tested this like so:

echo '{"date": "13th January 2025"}' | sqlite-utils insert dates.db dates -
sqlite-utils convert dates.db dates date r.parsedate
sqlite-utils rows dates.db dates

Output:

[{"date": "2025-01-13"}]