Automated emails functionality

[jespiron]

Usage: attendance email-absentees <MODE> <WEEK>

Single Week Mode:

attendance email-absentees single-week 5

Cumulative Mode:

attendance email-absentees cumulative <AFTER_WEEK> --min-absences <MIN_ABSENCES>

To add a new email template, create a section [templates.name_of_template] in config.toml:

[templates.weekly]
subject = "98008 Unexcused Absence"
body_path = "templates/email_weekly_body.html"

[templates.cumulative]
subject = "98008 Danger Zone for Attendance"
body_path = "templates/email_cumulative_body.html"

Then implement its respective filter function for email_absentees_generic.

To test:

1. Replace sender email in config.toml with your gmail
2. Enable 2FA for your gmail
3. Generate password from https://security.google.com/settings/security/apppasswords
4. Paste password into .env file

diesel setup
cargo run setup
cargo run week 1 mark-absent
cargo run week 2 mark-absent
cargo run email-absentees 1 2
y

...you should see that the email has been sent. If you'd like to see how it looks on the sender's end, edit ./examples/roster.csv to use your test email addresses.

Any response other than y should cancel the operation.

Some other changes:

• Added .env to gitignore and replaced with .env.example
• Moved roster.csv into config.toml

[connortsui20]

Looks good! I think a few adjustments and I can merge this into the other branch.

[connortsui20]

Is it possible to use the email builder instead to build these emails? We should aim to be telling people how many times they have been absent, for example if they are at 2 absences then that should be a different message.

https://docs.rs/lettre/latest/lettre/transport/index.html

[jespiron]

I previously used lettre, but the emails weren't sending, so I switched back to raw SMTP.
I can integrate lettre with enough plumbing, but I don't have bandwidth

[jespiron]

Ok, I introduced an email mode. Now we can send different templates with custom filtering functions based on the desired mode
See PR description for usage

[connortsui20]

We should want to email absentees for a specific week (not every person who has been absent after week 4), so this should be under the week args

[jespiron]

Ok, I introduced an email mode. Now we can send different templates with custom filtering functions based on the desired mode
See PR description for usage

[connortsui20]

LGTM