From 8a3d2c99bff60cb775ebc42516c0c3912d54ba3d Mon Sep 17 00:00:00 2001
From: Calvin Morrison <calvin@pobox.com>
Date: Sat, 22 Aug 2026 13:16:49 -0400
Subject: pim: personal information management, starting with a calendar

A calendar as a file tree, and tools that only know the tree:

	events/date/yyyy/mm/dd/hhmm-summary	as lived
	events/uuid/<uid>/			as stored
	ctl query alarm changed

lib/cal owns all of that. A backend supplies events and, where its
protocol allows, takes changes back -- six methods. cmd/icalfs is the
first: it reads .ics files from a directory and nothing else, because
fetching is rc/fetch's job and hget already exists. That keeps
net/http out of the binary and makes a subscribed calendar and a local
one the same thing.

The tools are rc on purpose. If the tree needs a compiled program to be
useful, the tree is the wrong shape. Three things were added to the
tree because the rc port needed them: a path from an occurrence to its
event, epoch seconds beside RFC3339, and a numeric slot for all-day
events so test(1) can compare it.

ctl reports caps, so a tool can say "read only" instead of trying and
failing. A published .ics is read only: nowhere to PUT, and no
METHOD:REQUEST to reply to. CalDAV would be read write rsvp schedule,
and that is the next backend.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
---
 pim/rc/next | 81 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 81 insertions(+)
 create mode 100755 pim/rc/next

(limited to 'pim/rc/next')

diff --git a/pim/rc/next b/pim/rc/next
new file mode 100755
index 0000000..0436cb3
--- /dev/null
+++ b/pim/rc/next
@@ -0,0 +1,81 @@
+#!/bin/rc
+# pim/next -- the next thing, one line, for a window label.
+rfork e
+
+# test(1) reads a leading zero as octal: 0700 compares as 448 and 0900
+# is a syntax error.  Strip the padding before any arithmetic.
+fn num {
+	echo $1 | sed 's/^0*//; s/^$/0/'
+}
+
+mtpt=/mnt/pim
+only=()
+while(~ $1 -*){
+	switch($1){
+	case -m
+		mtpt=$2; shift
+	case -c
+		only=($only $2); shift
+	case *
+		echo 'usage: next [-m mtpt] [-c cal]' >[1=2]
+		exit usage
+	}
+	shift
+}
+cals=$only
+if(~ $#cals 0)
+	cals=`{pim/calendars -m $mtpt}
+
+now=`{date -n}
+hhmm=`{num `{date -f hhmm $now}}
+tmp=/tmp/next.$pid
+fn sigexit { rm -f $tmp }
+
+i=0
+while(test $i -lt 14){
+	sec=`{echo $now + $i '*' 86400 | bc}
+	day=`{date -f YYYY/MM/DD $sec}
+	{
+		for(c in $cals){
+			d=$mtpt/calendars/$c/events/date/$day
+			if(test -d $d)
+			for(f in $d/*){
+				b=`{basename $f}
+				sum=`{sed -n 's/^summary: //p' $f}
+				echo $"b^'	'^$"c^'	'^$"sum
+			}
+		}
+	} | sort >$tmp
+	if(test -s $tmp){
+		day=''
+		if(test $i -gt 0){
+			d=`{date -f 'WWW DD MMM' $sec}
+			day=$"d^' '
+		}
+		# awk prints the finished line: a value carried back through
+		# an rc variable would be split on its tabs and rejoined
+		# with spaces
+		out=/tmp/next.out.$pid
+		awk -F'	' -v 'first='^$i -v 'now='^$"hhmm -v 'day='^$"day '
+		{
+			t = $1 + 0
+			if (first > 0 || t >= now) {
+				split($1, a, "-")
+				when = substr(a[1],1,2) ":" substr(a[1],3,2)
+				if ($1 ~ /^0000-allday-/)
+					when = "all day"
+				printf "%s%s %s\n", day, when, $3
+				exit
+			}
+		}' $tmp >$out
+		if(test -s $out){
+			cat $out
+			rm -f $out $tmp
+			exit 0
+		}
+		rm -f $out
+	}
+	i=`{echo $i + 1 | bc}
+}
+echo 'nothing scheduled'
+exit 0
-- 
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