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|
#!/usr/bin/env bash
# bollux: a bash gemini client
# Author: Case Duckworth
# License: MIT
# Version: 0.2.2
# Program information
PRGN="${0##*/}"
VRSN=0.2.2
# State
REDIRECTS=0
set -f
bollux_usage() {
cat <<END
$PRGN (v. $VRSN): a bash gemini client
usage:
$PRGN [-h]
$PRGN [-q] [-v] [URL]
flags:
-h show this help and exit
-q be quiet: log no messages
-v verbose: log more messages
parameters:
URL the URL to start in
If not provided, the user will be prompted.
END
}
run() {
log debug "$@"
"$@"
}
die() {
ec="$1"
shift
log error "$*"
exit "$ec"
}
# pure bash bible trim_string
trim() {
: "${1#"${1%%[![:space:]]*}"}"
: "${_%"${_##*[![:space:]]}"}"
printf '%s\n' "$_"
}
log() {
[[ "$BOLLUX_LOGLEVEL" == QUIET ]] && return
case "$1" in
d* | D*) # debug
[[ "$BOLLUX_LOGLEVEL" == DEBUG ]] || return
fmt=34
;;
e* | E*) # error
fmt=31
;;
*) fmt=1 ;;
esac
shift
printf >&2 '\e[%sm%s:\e[0m\t%s\n' "$fmt" "$PRGN" "$*"
}
# main entry point
bollux() {
run bollux_config
run bollux_args "$@"
run history_init
if [[ ! "${BOLLUX_URL:+isset}" ]]; then
run prompt GO BOLLUX_URL
fi
run blastoff "$BOLLUX_URL"
}
bollux_args() {
while getopts :hvq OPT; do
case "$OPT" in
h)
bollux_usage
exit
;;
v) BOLLUX_LOGLEVEL=DEBUG ;;
q) BOLLUX_LOGLEVEL=QUIET ;;
:) die 1 "Option -$OPTARG requires an argument" ;;
*) die 1 "Unknown option: -$OPTARG" ;;
esac
done
shift $((OPTIND - 1))
if (($# == 1)); then
BOLLUX_URL="$1"
fi
}
bollux_config() {
: "${BOLLUX_CONFIG:=${XDG_CONFIG_DIR:-$HOME/.config}/bollux/bollux.conf}"
if [ -f "$BOLLUX_CONFIG" ]; then
# shellcheck disable=1090
. "$BOLLUX_CONFIG"
else
log debug "Can't load config file '$BOLLUX_CONFIG'."
fi
## behavior
: "${BOLLUX_MAXREDIR:=5}" # max redirects
: "${BOLLUX_PORT:=1965}" # port number
: "${BOLLUX_PROTO:=gemini}" # default protocol
: "${BOLLUX_URL:=}" # start url
: "${BOLLUX_BYEMSG:=See You Space Cowboy...}" # bye message
## files
: "${BOLLUX_DATADIR:=${XDG_DATA_DIR:-$HOME/.local/share}/bollux}"
: "${BOLLUX_DOWNDIR:=.}" # where to save downloads
: "${BOLLUX_LESSKEY:=$BOLLUX_DATADIR/lesskey}" # where to store binds
: "${BOLLUX_PAGESRC:=$BOLLUX_DATADIR/pagesrc}" # where to save the source
BOLLUX_HISTFILE="$BOLLUX_DATADIR/history" # where to save the history
## typesetting
: "${T_MARGIN:=4}" # left and right margin
: "${T_WIDTH:=0}" # width of the viewport -- 0 = get term width
# colors -- these will be wrapped in \e[ __ m
C_RESET='\e[0m' # reset
: "${C_SIGIL:=35}" # sigil (=>, #, ##, ###, *, ```)
: "${C_LINK_NUMBER:=1}" # link number
: "${C_LINK_TITLE:=4}" # link title
: "${C_LINK_URL:=36}" # link URL
: "${C_HEADER1:=1;4}" # header 1 formatting
: "${C_HEADER2:=1}" # header 2 formatting
: "${C_HEADER3:=3}" # header 3 formatting
: "${C_LIST:=0}" # list formatting
: "${C_PRE:=0}" # preformatted text formatting
}
bollux_quit() {
log x "$BOLLUX_BYEMSG"
exit
}
set_title() {
printf '\e]2;%s - bollux\007' "$*"
}
prompt() {
prompt="$1"
shift
read </dev/tty -e -r -p "$prompt> " "$@"
}
blastoff() { # load a url
local well_formed=true
if [[ "$1" == "-u" ]]; then
well_formed=false
shift
fi
URL="$1"
if $well_formed && [[ "$1" != "$BOLLUX_URL" ]]; then
URL="$(run transform_resource "$BOLLUX_URL" "$1")"
fi
[[ "$URL" != *://* ]] && URL="$BOLLUX_PROTO://$URL"
URL="$(trim "$URL")"
server="${URL#*://}"
server="${server%%/*}"
log d "URL='$URL' server='$server'"
run request_url "$server" "$BOLLUX_PORT" "$URL" |
run handle_response "$URL"
}
transform_resource() { # transform_resource BASE_URL REFERENCE_URL
declare -A R B T # reference, base url, target
eval "$(run parse_url B "$1")"
eval "$(run parse_url R "$2")"
# A non-strict parser may ignore a scheme in the reference
# if it is identical to the base URI's scheme.
if ! "${STRICT:-true}" && [[ "${R[scheme]}" == "${B[scheme]}" ]]; then
unset "${R[scheme]}"
fi
# basically pseudo-code from spec ported to bash
if isdefined "R[scheme]"; then
T[scheme]="${R[scheme]}"
isdefined "R[authority]" && T[authority]="${R[authority]}"
isdefined R[path] &&
T[path]="$(run remove_dot_segments "${R[path]}")"
isdefined "R[query]" && T[query]="${R[query]}"
else
if isdefined "R[authority]"; then
T[authority]="${R[authority]}"
isdefined "R[authority]" &&
T[path]="$(remove_dot_segments "${R[path]}")"
isdefined R[query] && T[query]="${R[query]}"
else
if isempty "R[path]"; then
T[path]="${B[path]}"
if isdefined R[query]; then
T[query]="${R[query]}"
else
T[query]="${B[query]}"
fi
else
if [[ "${R[path]}" == /* ]]; then
T[path]="$(remove_dot_segments "${R[path]}")"
else
T[path]="$(merge_paths "B[authority]" "${B[path]}" "${R[path]}")"
T[path]="$(remove_dot_segments "${T[path]}")"
fi
isdefined R[query] && T[query]="${R[query]}"
fi
T[authority]="${B[authority]}"
fi
T[scheme]="${B[scheme]}"
fi
isdefined R[fragment] && T[fragment]="${R[fragment]}"
# cf. 5.3 -- recomposition
local r=""
isdefined "T[scheme]" && r="$r${T[scheme]}:"
# remove the port from the authority
isdefined "T[authority]" && r="$r//${T[authority]%:*}"
r="$r${T[path]}"
isdefined T[query] && r="$r?${T[query]}"
isdefined T[fragment] && r="$r#${T[fragment]}"
printf '%s\n' "$r"
}
merge_paths() { # 5.2.3
# shellcheck disable=2034
B_authority="$1"
B_path="$2"
R_path="$3"
# if R_path is empty, get rid of // in B_path
if [[ -z "$R_path" ]]; then
printf '%s\n' "${B_path//\/\//\//}"
return
fi
if isdefined "B_authority" && isempty "B_path"; then
printf '/%s\n' "${R_path//\/\//\//}"
else
if [[ "$B_path" == */* ]]; then
B_path="${B_path%/*}/"
else
B_path=""
fi
printf '%s/%s\n' "${B_path%/}" "${R_path#/}"
fi
}
remove_dot_segments() { # 5.2.4
local input="$1"
local output=
# ^/\.(/|$) - BASH_REMATCH[0]
while [[ "$input" ]]; do
if [[ "$input" =~ ^\.\.?/ ]]; then
input="${input#${BASH_REMATCH[0]}}"
elif [[ "$input" =~ ^/\.(/|$) ]]; then
input="/${input#${BASH_REMATCH[0]}}"
elif [[ "$input" =~ ^/\.\.(/|$) ]]; then
input="/${input#${BASH_REMATCH[0]}}"
[[ "$output" =~ /?[^/]+$ ]]
output="${output%${BASH_REMATCH[0]}}"
elif [[ "$input" == . || "$input" == .. ]]; then
input=
else
[[ $input =~ ^(/?[^/]*)(/?.*)$ ]] || log debug NOMATCH
output="$output${BASH_REMATCH[1]}"
input="${BASH_REMATCH[2]}"
fi
done
printf '%s\n' "${output//\/\//\//}"
}
parse_url() { # eval "$(split_url NAME STRING)" => NAME[...]
local name="$1"
local string="$2"
# shopt -u extglob # TODO port re ^ to extglob syntax
local re='^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?'
[[ $string =~ $re ]] || return $?
# shopt -s extglob
local scheme="${BASH_REMATCH[2]}"
local authority="${BASH_REMATCH[4]}"
local path="${BASH_REMATCH[5]}"
local query="${BASH_REMATCH[7]}"
local fragment="${BASH_REMATCH[9]}"
for c in scheme authority query fragment; do
[[ "${!c}" ]] &&
run printf '%s[%s]=%q\n' "$name" "$c" "${!c}"
done
# unclear if the path is always set even if empty but it looks that way
run printf '%s[path]=%q\n' "$name" "$path"
}
# is a NAME defined ('set' in bash)?
isdefined() { [[ "${!1+x}" ]]; } # isdefined NAME
# is a NAME defined AND empty?
isempty() { [[ ! "${!1-x}" ]]; } # isempty NAME
request_url() {
local server="$1"
local port="$2"
local url="$3"
# support for TLS v1.3 and v1.2
ssl_cmd=(openssl s_client -crlf -quiet -connect "$server:$port")
ssl_cmd+=(-servername "$server") # SNI
ssl_cmd_tls1_2=("${ssl_cmd[@]}" -tls1_2)
ssl_cmd_tls1_3=("${ssl_cmd[@]}" -tls1_3)
# always try to connect with TLS v1.3 first
run "${ssl_cmd_tls1_3[@]}" <<<"$url" 2>/dev/null || run "${ssl_cmd_tls1_2[@]}" <<<"$url" 2>/dev/null
}
handle_response() {
local URL="$1" code meta
while read -r -d $'\r' hdr; do
code="$(gawk '{print $1}' <<<"$hdr")"
meta="$(
gawk '{for(i=2;i<=NF;i++)printf "%s ",$i;printf "\n"}' <<<"$hdr"
)"
break
done
log x "[$code] $meta"
case "$code" in
1*)
REDIRECTS=0
run history_append "$URL" "$meta"
run prompt "$meta" QUERY
# shellcheck disable=2153
run blastoff "?$QUERY"
;;
2*)
REDIRECTS=0
# read ahead to find a title
while read -r; do
printf -v pretitle "%s\n" "$REPLY"
if [[ "$REPLY" =~ ^#[[:space:]]*(.*) ]]; then
title="${BASH_REMATCH[1]}"
break
fi
done
run history_append "$URL" "$title"
{
printf '%s' "$pretitle"
while read -r; do printf '%s\n' "$REPLY"; done
} | run display "$meta"
;;
3*)
((REDIRECTS += 1))
if ((REDIRECTS > BOLLUX_MAXREDIR)); then
die $((100 + code)) "Too many redirects!"
fi
run blastoff "$meta"
;;
4*)
REDIRECTS=0
die "$((100 + code))" "$code"
;;
5*)
REDIRECTS=0
die "$((100 + code))" "$code"
;;
6*)
REDIRECTS=0
die "$((100 + code))" "$code"
;;
*)
[[ -z "${code-}" ]] && die 100 "Empty response code."
die "$((100 + code)) Unknown response code: $code."
;;
esac
}
display() {
# split header line
local -a hdr
local i
IFS=$'\n' read -d "" -ra hdr <<<"${1//;/$'\n'}"
mime="$(trim "${hdr[0],,}")"
for ((i = 1; i <= "${#hdr[@]}"; i++)); do
h="$(trim "${hdr[$i]}")"
case "$h" in
charset=*) charset="${h#charset=}" ;;
esac
done
[[ -z "$mime" ]] && mime="text/gemini"
if [[ -z "$charset" ]]; then
charset="utf-8"
fi
log debug "mime='$mime'; charset='$charset'"
case "$mime" in
text/*)
set_title "$BOLLUX_URL"
less_cmd=(less -R)
{
[[ -r "$BOLLUX_LESSKEY" ]] || mklesskey "$BOLLUX_LESSKEY"
} && less_cmd+=(-k "$BOLLUX_LESSKEY")
less_cmd+=(
-Pm'bollux$'
-PM'o\:open, g\:goto, r\:refresh$'
-M
)
submime="${mime#*/}"
if declare -F | grep -q "$submime"; then
log d "typeset_$submime"
{
normalize_crlf |
iconv -f "${charset^^}" -t "UTF-8" |
tee "$BOLLUX_PAGESRC" |
run "typeset_$submime" |
run "${less_cmd[@]}" && bollux_quit
} || run handle_keypress "$?"
else
log "cat"
{
normalize_crlf |
iconv -f "${charset^^}" -t "UTF-8" |
tee "$BOLLUX_PAGESRC" |
run "${less_cmd[@]}" && bollux_quit
} || run handle_keypress "$?"
fi
;;
*) run download "$BOLLUX_URL" ;;
esac
}
mklesskey() {
lesskey -o "$1" - <<-END
#command
o quit 0 # 48 open a link
g quit 1 # 49 goto a url
[ quit 2 # 50 back
] quit 3 # 51 forward
r quit 4 # 52 re-request / download
# other keybinds
\40 forw-screen-force
END
}
normalize_crlf() {
shopt -s extglob
while IFS= read -r; do
printf '%s\n' "${REPLY//$'\r'?($'\n')/}"
done
shopt -u extglob
}
typeset_gemini() {
local pre=false
local ln=0 # link number
if ((T_WIDTH == 0)); then
shopt -s checkwinsize
(
:
:
) # XXX this doesn't work!?
log d "LINES=$LINES; COLUMNS=$COLUMNS"
T_WIDTH=$COLUMNS
fi
WIDTH=$((T_WIDTH - T_MARGIN))
((WIDTH < 0)) && WIDTH=80 # default if dumb
S_MARGIN=$((T_MARGIN - 1)) # spacing
log d "T_WIDTH=$T_WIDTH"
log d "WIDTH=$WIDTH"
while IFS= read -r; do
case "$REPLY" in
'```'*)
if $pre; then
pre=false
else
pre=true
fi
continue
;;
=\>*)
: $((ln += 1))
gemini_link "$REPLY" $pre "$ln"
;;
\#*) gemini_header "$REPLY" $pre ;;
\**)
if [[ "$REPLY" =~ ^\*[[:space:]]+ ]]; then
gemini_list "$REPLY" $pre
else
gemini_text "$REPLY" $pre
fi
;;
*) gemini_text "$REPLY" $pre ;;
esac
done
}
gemini_link() {
local re="^(=>)[[:blank:]]*([^[:blank:]]+)[[:blank:]]*(.*)"
local s t a l # sigil, text, annotation(url), line
if ! ${2-false} && [[ "$1" =~ $re ]]; then
s="${BASH_REMATCH[1]}"
a="${BASH_REMATCH[2]}"
t="${BASH_REMATCH[3]}"
if [[ -z "$t" ]]; then
t="$a"
a=
fi
printf "\e[${C_SIGIL}m%${S_MARGIN}s ${C_RESET}" "$s"
printf -v l "\e[${C_LINK_NUMBER}m[%d]${C_RESET} \
\e[${C_LINK_TITLE}m%s${C_RESET} \
\e[${C_LINK_URL}m%s${C_RESET}\n" \
"$3" "$t" "$a"
fold_line "$WIDTH" "$l"
else
gemini_pre "$1"
fi
}
gemini_header() {
local re="^(#+)[[:blank:]]*(.*)"
local s t a l # sigil, text, annotation(lvl), line
if ! ${2-false} && [[ "$1" =~ $re ]]; then
s="${BASH_REMATCH[1]}"
a="${#BASH_REMATCH[1]}"
t="${BASH_REMATCH[2]}"
local hdrfmt
hdrfmt="$(eval echo "\$C_HEADER$a")"
printf "\e[${C_SIGIL}m%${S_MARGIN}s ${C_RESET}" "$s"
printf -v l "\e[${hdrfmt}m%s${C_RESET}\n" "$t"
fold_line "$WIDTH" "$l"
else
gemini_pre "$1"
fi
}
gemini_list() {
local re="^(\*)[[:blank:]]*(.*)"
local s t a l # sigil, text, annotation(n/a), line
if ! ${2-false} && [[ "$1" =~ $re ]]; then
s="${BASH_REMATCH[1]}"
t="${BASH_REMATCH[2]}"
printf "\e[${C_SIGIL}m%${S_MARGIN}s " "$s"
printf -v l "\e[${C_LIST}m%s${C_RESET}\n" "$t"
fold_line "$WIDTH" "$l"
else
gemini_pre "$1"
fi
}
gemini_text() {
if ! ${2-false}; then
printf "%${S_MARGIN}s " ' '
fold_line "$WIDTH" "$1"
else
gemini_pre "$1"
fi
}
gemini_pre() {
printf "\e[${C_SIGIL}m%${S_MARGIN}s " '```'
printf "\e[${C_PRE}m%s${C_RESET}\n" "$1"
}
fold_line() { # fold_line WIDTH TEXT
local width="$1"
local margin="${2%%[![:space:]]*}"
if [[ "$margin" ]]; then
margin="${#margin}"
else
margin="$T_MARGIN"
fi
local ll=0 wl plain
# shellcheck disable=2086
set -- $2 # TODO: is this the best way?
for word; do
plain="${word//$'\x1b'\[*([0-9;])m/}"
wl=$((${#plain} + 1))
if (((ll + wl) >= width)); then
printf "\n%${margin}s" ' '
ll=$wl
else
ll=$((ll + wl))
fi
printf '%s ' "$word"
done
printf '\n'
}
handle_keypress() {
case "$1" in
48) # o - open a link -- show a menu of links on the page
run select_url "$BOLLUX_PAGESRC"
;;
49) # g - goto a url -- input a new url
prompt GO URL
run blastoff -u "$URL"
;;
50) # [ - back in the history
run history_back || {
sleep 0.5
run blastoff "$BOLLUX_URL"
}
;;
51) # ] - forward in the history
run history_forward || {
sleep 0.5
run blastoff "$BOLLUX_URL"
}
;;
52) # r - re-request the current resource
run blastoff "$BOLLUX_URL"
;;
*) # 53-57 -- still available for binding
;;
esac
}
select_url() {
run mapfile -t < <(extract_links <"$1")
select u in "${MAPFILE[@]}"; do
case "$REPLY" in
q) bollux_quit ;;
esac
run blastoff "$(gawk '{print $1}' <<<"$u")" && break
done </dev/tty
}
extract_links() {
local url alt
while read -r line; do
if [[ "$line" =~ ^=\>[[:space:]]*([^[:space:]]+)([[:space:]]+(.*))?$ ]]; then
url="${BASH_REMATCH[1]}"
alt="${BASH_REMATCH[3]}"
if [[ "$alt" ]]; then
printf '%s \e[34m(%s)\e[0m\n' "$url" "$alt"
else
printf '%s\n' "$url"
fi
fi
done
}
download() {
tn="$(mktemp)"
log x "Downloading: '$BOLLUX_URL' => '$tn'..."
dd status=progress >"$tn"
fn="$BOLLUX_DOWNDIR/${BOLLUX_URL##*/}"
if [[ -f "$fn" ]]; then
log x "Saved '$tn'."
elif mv "$tn" "$fn"; then
log x "Saved '$fn'."
else
log error "Error saving '$fn': downloaded to '$tn'."
fi
}
history_init() {
declare -a HISTORY # history is kept in an array
HN=0 # position of history in the array
run mkdir -p "${BOLLUX_HISTFILE%/*}"
}
history_append() { # history_append URL TITLE
BOLLUX_URL="$1"
# date/time, url, title (best guess)
run printf '%(%FT%T)T\t%s\t%s\n' -1 "$1" "$2" >>"$BOLLUX_HISTFILE"
HISTORY[$HN]="$BOLLUX_URL"
((HN += 1))
}
history_back() {
log d "HN=$HN"
((HN -= 2))
if ((HN < 0)); then
HN=0
log e "Beginning of history."
return 1
fi
run blastoff "${HISTORY[$HN]}"
}
history_forward() {
log d "HN=$HN"
if ((HN >= ${#HISTORY[@]})); then
HN="${#HISTORY[@]}"
log e "End of history."
return 1
fi
run blastoff "${HISTORY[$HN]}"
}
if [[ "${BASH_SOURCE[0]}" == "$0" ]]; then
run bollux "$@"
else
BOLLUX_LOGLEVEL=DEBUG
fi
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