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#!/bin/sh
## twerk: a twtxt client
# by Case Duckworth
### Entry point
usage() {
cat >&2 <<EOF
TWERK: a twtxt client
usage: twerk [options] [file]
twerk can be fed a list of URLs from standard input or from a FILE.
Each line is expected to contain a URL of a twtxt feed and (optionally) the
display name to use for that feed.
options (default):
-h Show this help and exit.
-t Include the time in each post date.
-f Force redownload of twt data.
-n LIMIT Only show LIMIT posts (25). 0 means no limit.
-w WIDTH Limit the output's width to WIDTH characters (72).
-W WIDTH Limit the username's width to WIDTH characters (12).
-i INDENT Use INDENT spaces as a hanging indent for too-long lines
([calculated]).
-p COMMAND Use COMMAND to post twts ([not set]).
This command will be fed a twtxt-formatted string via stdin.
Recommended: \`ssh <host> tee -a <file>\`.
parameters:
FILE List of twtxt feeds to fetch, one feed per line.
Optionally, a string after the feed URL will be its
display name.
EOF
exit "${1:-0}"
}
configure() {
# defaults
TWERK_WIDTH="${TWERK_WIDTH:-72}"
TWERK_LIMIT="${TWERK_LIMIT:-25}"
TWERK_INCLUDE_TIME="${TWERK_INCLUDE_TIME:-0}"
TWERK_USER_WIDTH="${TWERK_USER_WIDTH:-12}"
TWERK_HANG="${TWERK_HANG:-}" # empty to calculate off other variables
TWERK_FORCE="${TWERK_FORCE:-false}"
TWERK_POST_COMMAND="${TWERK_POST_COMMAND:-:}" # no-op
while getopts htfn:w:W:i:p:c: opt
do
case "$opt" in
h) usage ;;
t) TWERK_INCLUDE_TIME=1 ;;
f) TWERK_FORCE=true ;;
n) TWERK_LIMIT="$OPTARG" ;;
w) TWERK_WIDTH="$OPTARG" ;;
W) TWERK_USER_WIDTH="$OPTARG" ;;
i) TWERK_HANG="$OPTARG" ;;
p) TWERK_POST_COMMAND="$OPTARG" ;;
c) TWERK_FEEDS="$OPTARG" ;;
*) usage 1 ;;
esac
done
if test -z "$TWERK_HANG"
then
TWERK_HANG=$((TWERK_USER_WIDTH+(TWERK_INCLUDE_TIME*6)+10+3))
echo >&2 "$TWERK_HANG"
fi
}
main() {
TWERK_CACHE="${XDG_CACHE_HOME:-$HOME/.cache}/twerk"
mkdir -p "$TWERK_CACHE"
TWERK_FILE="$TWERK_CACHE/:file:"
TWERK_LESSKEY="$TWERK_CACHE/:lesskey:"
lesskey_setup
if "$_TWERK_INITIAL"
then
configure "$@"
shift "$((OPTIND - 1))"
TWERK_FEEDS="$1"
fi
cat "$TWERK_FEEDS" |
fetch_posts |
sort_posts |
limit_posts "$TWERK_LIMIT" |
format_posts > "$TWERK_FILE"
read_posts "$TWERK_FILE"
}
### Library
fetch_posts() {
while read -r url name
do
if test -z "$name"
then
file="$TWERK_CACHE/$(url_normalize "$name")"
else
file="$TWERK_CACHE/$name"
fi
if "$TWERK_FORCE" || test -z "$(find "$file" -prune -mtime -1 2>/dev/null)"
then
printf >&2 'Downloading %s...\n' "$url"
curl -sf "$url" |
filter_lines |
while read -r date post
do
printf '%s\t%s\t%s\t%s\n' \
"$date" "$name" "$url" "$post"
done |
tee "$file"
else
cat "$file"
fi
done
}
url_normalize() {
printf '%s\n' "$1" | tr -d ':/~'
}
filter_lines() {
while read -r line
do
case "$line" in
\#*) ;;
'') ;;
*) printf '%s\n' "$line" ;;
esac
done
}
limit_posts() {
ln=0
while read -r line
do
if test "$1" -ne 0 && test "$ln" -gt "$1"
then
break
fi
printf '%s\n' "$line"
ln=$((ln+1))
done
}
sort_posts() {
sort -r
}
format_posts() {
while IFS=' ' read -r date name url post
do
if test 0 -eq "$TWERK_INCLUDE_TIME"
then
TWERK_DATE_WIDTH=10
date="${date%T*}"
else
TWERK_DATE_WIDTH=16
fi
printf "%${TWERK_DATE_WIDTH}s | %${TWERK_USER_WIDTH}s | " \
"$(echo "$date" | head -c$TWERK_DATE_WIDTH)" \
"$(echo "$name" | head -c$TWERK_USER_WIDTH)"
export url name date post TWERK_WIDTH TWERK_HANG
export linewidth="$TWERK_HANG"
printf '%s\n' "$post" |
tr ' ' '\n' |
while IFS= read word
do
if test $(( linewidth + ${#word} )) -ge "$TWERK_WIDTH"
then
echo
linewidth=0
printf "%${TWERK_HANG}s \` " ""
linewidth=$((linewidth+TWERK_HANG+2))
fi
printf '%s ' "$word"
linewidth=$((linewidth + ${#word}))
done
echo
done
}
lesskey_setup() {
# t will exit with code 48
if ! test -r "$TWERK_LESSKEY"
then
lesskey -o "$TWERK_LESSKEY" - <<EOF
#command
t quit 0
g quit 1
#line-edit
#env
EOF
fi
}
read_posts() {
less \
-k "$TWERK_LESSKEY" \
-Pm'twerk! t\: twt, g\: refresh' -m \
"$1"
case "$?" in
0) exit ;;
48) post ;;
49) refresh ;;
esac
}
post() {
printf 'Twt: ' >&2
read -r post
post="$(printf '%s\t%s\n' "$(date +'%FT%T%z')" "$post")"
eval "printf '%s\n' \"\$post\" | $TWERK_POST_COMMAND"
_TWERK_INITIAL=false main "$TWERK_FEEDS"
}
refresh() {
TWERK_FORCE=true main "$TWERK_FEEDS"
}
###################################
_TWERK_INITIAL=true
test -z "$DEBUG" || set -x
test -z "$SOURCE" && main "$@"
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