Add -M option to display Monday as the first day of the week in cal(1)

[vallbsd]

As you can find, FreeBSD cal(1) man page says that

It is not possible to display Monday as the first day of the week with cal.

But daily it is more comfortable if weeks start from Monday.
I know that there is ncal (vertical) mode which always starts from Monday,
but any other calendar in the world (software or that on the wall) is horizontal,
so ncal is uncomfortable too.
So I've made a simple patch that adds -M option to cal(1) to start week from Monday.
Tried to make as minimal changes to original code as possible.

[concussious]

I can only comment on the manual page. Would you be willing to tag SPDX?

.\"-
.\" SPDX-License-Identifier: BSD-2-Clause
.\"

This patch is a nice change for Germans who start weeks on Mondays.

[concussious]

Thanks! After this, manual changes LGTM.

[concussious]

Co-authored is incorrect in this case. This work is entirely your own. The appropriate way to credit me is with a Reviewed by: trailer.

Please squash these down to one commit. The first word should describe what's being changed, then a colon, then a short description.

Since this change shouldn't break anything, don't forget to specify MFC after: in order for this work to get into stable. Otherwise, it will stay in the development branch until FreeBSD 15.

Example:

ncal: add -M to start week on Monday

MFC after: 2 weeks
Reviewed by: Alexander Ziaee (manual)

[vallbsd]

Please squash these down to one commit. The first word should describe what's being changed, then a colon, then a short description.

Example:

ncal: add -M to start week on Monday

MFC after: 2 weeks
Reviewed by: Alexander Ziaee (manual)

It seems I've done this right ))

[concussious]

Again, you still have to find someone to review the src, but everything I'm qualified to comment on looks great.

[bsdimp]

Thanks for coming here and submitting. Two very minor style nits, but the rest looks great.

[bsdimp]

I expect the builds to work... and the commit message looks good too.

[concussious]

I tested it the other day, build worked on amd64/main.

[emaste]

Is there another cal implementation that uses -M to start on Monday?

[bsdimp]

I looked briefly. I couldn't find one. Gcal was the only other cli program I found. It can also do Monday start, but that is tied to using isolated week mode...

[vallbsd]

Is there another cal implementation that uses -M to start on Monday?

Debian/Ubuntu uses FreeBSD's patched ncal in their bases with -M for Monday added.

OpenBSD and util-linux use -m for this, but it's already occupied in ncal to print custom month.
Also -M can be useful here in case someone wishes to add -S to start week on Sunday in vertical (ncal) mode :-)

[concussious]

Is there another cal implementation that uses -M to start on Monday?

Debian/Ubuntu uses FreeBSD's patched ncal in their bases with -M for Monday added.

Wow, are you guys seeing this? They took BSDL code, improved it, and didn't wrap it in GPL! Ian Murdock was a great man.

https://metadata.ftp-master.debian.org/changelogs//main/b/bsdmainutils/bsdmainutils_12.1.7+nmu3_copyright

[bsdimp]

Is there another cal implementation that uses -M to start on Monday?

Debian/Ubuntu uses FreeBSD's patched ncal in their bases with -M for Monday added.

Wow, are you guys seeing this? They took BSDL code, improved it, and didn't wrap it in GPL! Ian Murdock was a great man.

https://metadata.ftp-master.debian.org/changelogs//main/b/bsdmainutils/bsdmainutils_12.1.7+nmu3_copyright

Yea. But didn't keep up with upstream... It's good they kept the original license... A lot of early BSDL and BSDL-ish code was swallowed by the GPL either just because they felt like it, or because in a few cases, they located the original author and they said yes. I applaud this group for doing the right thing.

[bsdimp]

Seems good now.