note

#!/bin/sh

### Description: note -- Create a new note in $NOTESDIR
### Author: Michael Grbb
### Modeline: vi:set ai ts=4 sw=4 ft=sh:

PROG=`basename $0`
USAGE="
Usage:  $PROG [-m message] [-l] [-p] [-s] [notename|tag...]

	Open a new note in an editor.
	-l		List notes
	-p		Display the note 'notename'
	-s		Search for notes containing any of the tags listed
			Tags are specified in note files by starting a line
			with '#->TAGS:'
	-m message	Write message as the contents of the new note and
			do not open in an editor
	notename	if no options are given and the note 'notename'
			does not exist, create it and open it in an editor.
			If the note does exist, it will be opened in an editor.


"
SYNTAX="$PROG: Error: option syntax error"

if [ -z "$NOTESDIR" -o ! -d "$NOTESDIR/." ]
then
	if [ -d "$HOME/.notes/." ]
	then
		NOTESDIR="$HOME/.notes"
		echo "$PROG: Warning: NOTESDIR not set, using $HOME/.notes." >&2
	elif [ -d "$HOME/notes/." ]
	then
		NOTESDIR="$HOME/notes"
		echo "$PROG: Warning: NOTESDIR not set, using $HOME/notes." >&2
	else
		echo "$PROG: Error: NOTESDIR not set" >&2
		exit 2
	fi
fi

ED=
{ [ -n "$VISUAL" ] && ED="$VISUAL"; } || \
{ [ -n "$EDITOR" ] && ED="$EDITOR"; } || \
{ [ -e /usr/bin/vi ] && ED=/usr/bin/vi; } || \
{ [ -e /bin/vi ] && ED=/bin/vi; } || \
{ [ -e /bin/ed ] && ED=/bin/ed; } || \
{ EDWARN="$PROG: Warning: Could not locate an editor."; }

opt_l=; opt_p= 
opt_m=; message=
notename=
badarg=

while [ $# -gt 0 ]
do
	ARG="$1"
	case "$ARG" in
		-l)	opt_l=-l; break;;
		-p)	shift; opt_p=-p; break;;
		-m)	shift; opt_m=-m; message="$1";;
		# TODO: implement search function
		-s)	opt_s=-s; echo "$PROG: Not yet implemented";;
		-?)	badarg="$ARG"; break;;
		--)	shift; break;;	
		*) break;;
	esac
	shift
done

if [ "$#" -le 0 -a -z "$opt_l" ]
then
	echo "$USAGE" >&2
	exit 1
else
	notename="$1"
fi

if [ -n "$opt_l" ]
then
	echo "Notes:"
	for f in ${NOTESDIR}/*.txt
	do
		echo `basename "$f" .txt`
	done
	exit 0
fi


if [ -n "$badarg" ]
then
	echo "$SYNTAX: Unknown argument $badarg" >&2
	echo "$USAGE" >&2
	exit 1
fi

if [ -n "$opt_p" ]
then
	if [ -z "$notename" ]
	then
		echo "$SYNTAX: Missing notename" >&2
		echo "$USAGE" >&2
		exit 1
	fi

	if [ -f "$NOTESDIR/${notename}.txt" ]
	then
		cat "$NOTESDIR/${notename}.txt"
		exit 0
	else
		echo "$PROG: Error: No note named '$notename' exists" >&2
		exit 2
	fi
fi

if [ -n "$opt_m" ]
then
	if [ -z "$message" ]
	then
		echo "$SYNTAX: Missing message parameter to -m" >&2
		echo "$USAGE" >&2
		exit 1
	fi

	if [ -z "$notename" ]
	then
		echo "$SYNTAX: Missing notename" >&2
		echo "$USAGE" >&2
		exit 1
	fi

	if [ -f "$NOTESDIR/${notename}.txt" ]
	then
		echo "$PROG: Error: Note '$notename' already exists, use $PROG $notename instead."
		exit 2
	fi

	echo "$message" > "$NOTESDIR/${notename}.txt"
	exit 0
fi

if [ -z "$notename" ]
then
	echo "$SYNTAX: Missing notename" >&2
	echo "$USAGE" >&2
	exit 1
elif [ -f "$NOTESDIR/${notename}.txt" ]
then
	if [ -n "$EDWARN" ]
	then
		echo "$EDWARN" >&2
		exit 1
	else
		$ED "$NOTESDIR/${notename}.txt"
	fi
	exit 0
else
	touch "$NOTESDIR/${notename}.txt"
	if [ -n "$EDWARN" ]
	then
		echo "$EDWARN" >&2
		exit 1
	fi
	$ED "$NOTESDIR/${notename}.txt"
	exit 0
fi