Add format specifiers for day of year

[faizahfarzana]

• Add two new file name templates:

  1. {0:yyyy-jjj HH-mm-ss} for day of the year with leading zeroes
  2. {0:yyyy-j HH-mm-ss} for day of the year without leading zeroes

• If the chosen format contains "jjj" or "j", format the file name accordingly. Otherwise use the standard format specifiers.

Related Issue: #49

[eltos]

Hi @faizahfarzana
Thanks for working on this.

Could you please make sure that your implementation meets the following requirements:

• Only consider j inside variable expression for variable 0
• Correctly handle arbitrarily format specifiers with the letter j

Example templates for which your proposed implementation doesn't work:

• "photos_jan_{1:000}"
• "image {0:y-j-H-m-s}"
• "Day {0:j} of {0:yyyy}"

[faizahfarzana]

@eltos thanks for your feedback. I'll work on it.

[eltos]

Before I forget, some people might even use the variable expression multiple times, e.g. Day {0:j} of {0:yyyy} for "Day 123 of 2024". So "j" might be in any of them.