[Feature request] Read from stdin without import

[avidseeker]

Many smartphone journaling apps add a calendar view to journal entries.

It would be nice if calcurse can read from stdin and visualize the input "on-the-fly" without having to import.

For example, if journal.md contains:

# 2023-04-25: Created hello world app
bla bla bla
# 2023-01-10: Wrote lorem ipsum
lorem ipsum
...

If this feature is implemented, then one can run:

sed -n "s/^#//p" journal.md | calcurse -

to make calcurse view journal summaries in any view the user likes (weekly, monthly, etc). Of course this has many other possibilities like visualizing habits from csv file or visualizing git commits, etc...

And with simple text stream manipulation, the input can be modified to be exactly the format calcurse expects it to be.

As a current workaround, it's possible to import events to specified data and apts files, different than the main calendar.

[avidseeker]

A limited workaround using zsh:

$ calcurse -c =(echo "07/01/2024 [1] Today is the day")

For the same reason mentioned here in #484, <(echo) and calcurse -c /dev/stdin don't work.