gopher.sh

   1 #!/bin/sh
   2
   3 # $0 [gopher uri] ([mode])
   4 #       uri: the gopher URI to dig to, e.g.:
   5 #               - gopher://sdf.org:70/1/faq
   6 #               - sdf.org/faq
   7 #               - sdf.org/1/faq
   8 #               - http://gopher.nikiroo.be:80/news
   9 #               - ...
  10 #               default port is 70 for gopher, 80 for http, 443 for https
  11 #               default filetype depends upon selector:
  12 #               - 0: plain text
  13 #               - 1: menu (dir-like)
  14 #               - ...
  15 #               - download: fake mode to download the result without changes
  16
  17 # Manual:
  18 #       When asked for a number (non-dialog uses only), you can also
  19 #       enter 'n' or 'p' to get the next or previous item (+1 or -1)
  20
  21 # ENV variables:
  22 #       USE_DIALOG: force the usage of the command 'dialog'
  23 #                 : true if dialog is found
  24 #               0 : do not
  25 #               1 : force the use of dialog
  26 #       LINK_COLOR: escape sequences colour (def: 2)
  27 #               - : means no escape sequence
  28 #               1 : means colour 1
  29 #               2 : means colour 2
  30 #               [...]
  31 #       INVERT    : invert the output for image viewing (for white backgrounds)
  32 #               0 : do not invert (default)
  33 #               1 : invert
  34
  35 # EXIT Codes:
  36 #         0: ok
  37 #         1: syntax error
  38 #         2: cannot contact server
  39 #         3: unknown selector mode
  40 #       255: special exit more 'q'
  41
  42 URI="$1"
  43
  44 PREFIX="[0-9hIg+]"
  45
  46 PROTOCOL="`echo $URI | sed 's|^\([^:]*://\)\?\([^:/]*\)\(:[^/]*\)\?/\?\(.*\)\?|\1|g'`"
  47 SERVER="`echo $URI | sed 's|^\([^:]*://\)\?\([^:/]*\)\(:[^/]*\)\?/\?\(.*\)\?|\2|g'`"
  48 PORT="`echo $URI | sed 's|^\([^:]*://\)\?\([^:/]*\)\(:[^/]*\)\?/\?\(.*\)\?|\3|g'`"
  49 SELECTOR="`echo $URI | sed 's|^\([^:]*://\)\?\([^:/]*\)\(:[^/]*\)\?/\?\(.*\)\?|\4|g'`"
  50 MODE=
  51
  52 PORT="`echo "$PORT" | sed 's/^://'`"
  53
  54 # Defaults:
  55 if [ "$PORT" = "" ];then
  56         case "$PROTOCOL" in
  57         http)  PORT=80 ;;
  58         https) PORT=443;;
  59         *)     PORT=70 ;;
  60         esac
  61 fi
  62
  63 if [ "$MODE" = "" ]; then
  64         # "" or dir-like selector? -> 1 ; if not -> 0
  65         echo "$SELECTOR" | grep "/$" >/dev/null && MODE=1 || MODE=0
  66         [ "$SELECTOR" = "" ] && MODE=1
  67
  68         # check explicit modes:
  69         if echo "$SELECTOR" | grep "^/\?\($PREFIX\|download\)/" >/dev/null; then
  70                 MODE="`echo "$SELECTOR" | sed 's:^/\?\([^/]*\)/\(.*\):\1:'`"
  71                 SELECTOR="`echo "$SELECTOR" | sed 's:^/\?\([^/]*\)/\(.*\):\2:'`"
  72         fi
  73 fi
  74
  75 if [ "$SERVER" = "" ]; then
  76         echo "Syntax error: $0 [gopher uri]" >&2
  77         exit 1
  78 fi
  79
  80 # can be "-" for no escape sequences
  81 [ "$LINK_COLOR" = ""  ] && LINK_COLOR=2
  82
  83 # Start and end link tags
  84 SL=
  85 EL=
  86 if [ "$LINK_COLOR" != "-" ]; then
  87         SL="`tput setf $LINK_COLOR``tput setaf $LINK_COLOR`"
  88         EL="`tput init`"
  89         export LESS="${LESS} -R"
  90 fi
  91
  92 # 'dialog' or text
  93 if [ "$USE_DIALOG" = "" ]; then
  94         if dialog --help >/dev/null 2>&1; then
  95                 USE_DIALOG=1
  96         else
  97                 USE_DIALOG=0
  98         fi
  99 fi
 100
 101 # Invert image viewer
 102 if [ "$INVERT" = 1 ]; then
 103         INVERT="--invert"
 104 else
 105         INVERT=
 106 fi
 107
 108 # $0 [FILE] (dialog)
 109 # Display a gopher menu for the given resource
 110 cat_menu() {
 111         i=0
 112         cat "$1" | grep "^i\|^$PREFIX" | sed 's:\\:\\\\\\\\:g' | while read ln; do
 113                 if echo "$ln" | grep "^i" >/dev/null 2>&1; then
 114                         if [ "$2" != dialog ]; then
 115                                 echo "$ln" | sed "s:^.\([^\t]*\).*$:    \1:g"
 116                         else
 117                                 echo "$ln" | sed 's:":'"''"':g;s:^.\([^\t]*\).*$:"      " "\1":g'
 118                         fi
 119                 elif echo "$ln" | grep "^$PREFIX" >/dev/null 2>&1; then
 120                         i=`expr $i + 1`
 121                         [ $i -le 9 ] && i=0$i
 122                         field="`echo "$ln" | cut -c1`"
 123                         case "$field" in
 124                                 0) typ='TXT';;
 125                                 1) typ='DIR';; # menu, actually
 126                                 7) typ='(?)';; # query
 127                                 8) typ='TEL';; # TELnet (not TELephone)
 128                                 h) typ='WEB';; # HTML
 129                                 I) typ='IMG';;
 130                                 g) typ='GIF';;
 131                                 +) typ='SVR';; # redundant server
 132                                 *) typ='!!!';;
 133                         esac
 134                         if [ "$2" != dialog ]; then
 135                                 echo "$ln" | sed "s:^.\\([^\t]*\\).*:$typ $i    $SL\\1$EL:g"
 136                         else
 137                                 echo "$ln" | sed "s:"'"'":'':g;s:^.\\([^\t]*\\).*:"'"'"$typ $i"'"'" "'"\1"'":g"
 138                         fi
 139                 fi
 140         done
 141 }
 142
 143 # $0 [FILE] [INDEX] [FIELD]
 144 # Get a field from the given-by-index link in FILE
 145 #
 146 # Fields:
 147 #       1 = type/name
 148 #       2 = selector
 149 #       3 = server
 150 #       4 = port
 151 getsel() {
 152         cat "$1" | grep "^$PREFIX" | tail -n+"$2" | head -n 1 | cut -f"$3"
 153 }
 154
 155 # Save page content to 'tmp' file
 156 tmp="`mktemp -t gofetch.current_page.XXXXXX`"
 157 finish() {
 158   rm -rf "$tmp" "$tmp.jpg" "$tmp.menu" "$tmp.choice"
 159 }
 160 trap finish EXIT
 161
 162 ok=true
 163 if [ "$PROTOCOL" = gopher:// -o "$PROTOCOL" = "" ]; then
 164         echo "$SELECTOR" | nc "$SERVER" "$PORT" > "$tmp" || ok=false
 165 else
 166         if wget -h >/dev/null 2>&1; then
 167                 wget "${PROTOCOL}$SERVER:$PORT/$SELECTOR" -O "$tmp" >/dev/null 2>&1
 168         else
 169                 curl "${PROTOCOL}$SERVER:$PORT/$SELECTOR" > "$tmp" 2>/dev/null
 170         fi
 171 fi
 172
 173 if [ $ok = false ]; then
 174         echo Cannot contact gopher uri "[$URI]" >&2
 175         exit 2
 176 fi
 177
 178 if [ $MODE = 1 ]; then
 179         sed --in-place 's:\r\n:\n:g;s:\r::g' "$tmp"
 180 fi
 181
 182 # Process page content
 183 case "$MODE" in
 184 download)
 185         # Special, fake mode, only from top-level
 186         cat "$tmp"
 187 ;;
 188 0)
 189         cat "$tmp" | less
 190 ;;
 191 1|+)
 192         CHOICE=0
 193         while [ "$CHOICE" != "" ]; do
 194                 if [ "$USE_DIALOG" = 1 ]; then
 195                         > "$tmp.menu"
 196                         cat_menu "$tmp" dialog | while read ln; do
 197                                 echo -n " $ln" >> "$tmp.menu"
 198                         done
 199                         [ "$LINES"   = "" ] && LINES=`tput lines`
 200                         [ "$COLUMNS" = "" ] && COLUMNS=`tput cols`
 201                         title="$SERVER: $SELECTOR"
 202                         dialog  --extra-button --extra-label Back \
 203                                 --cancel-label Exit \
 204                                 --no-shadow \
 205                                 --menu "$title" \
 206                                 "$LINES" "$COLUMNS" "$LINES" \
 207                                 --file "$tmp.menu" 2>"$tmp.choice"
 208                         val=$?
 209                         clear
 210
 211                         if [ $val = 3 ]; then
 212                                 CHOICE=""
 213                         elif [ $val = 1 ]; then
 214                                 CHOICE="q"
 215                         else
 216                                 CHOICE="`cat "$tmp.choice" | cut -c5-`"
 217                         fi
 218
 219                         rm "$tmp.menu"
 220                         rm "$tmp.choice"
 221                 else
 222                         cat_menu "$tmp" | less
 223                         read -p "[$SELECTOR]: " NEW_CHOICE
 224                         if [ "$NEW_CHOICE" = p ]; then
 225                                 CHOICE=`expr "$CHOICE" - 1 2>/dev/null`
 226                                 if [ "$CHOICE" -lt 0 ]; then
 227                                         CHOICE=`cat "$tmp" | grep "^$PREFIX" | wc --lines`
 228                                 fi
 229                         elif [ "$NEW_CHOICE" = n ]; then
 230                                 CHOICE=`expr "$CHOICE" + 1 2>/dev/null`
 231                         else
 232                                 CHOICE="$NEW_CHOICE"
 233                         fi
 234                 fi
 235
 236                 [ "$CHOICE" = q ] && exit 255 # force-quit
 237                 index="`expr 1 \* "$CHOICE" 2>/dev/null`"
 238                 if [ "$index" != "" ]; then
 239                         goto_server="`getsel "$tmp" $index 3`"
 240                         goto_sel="`getsel "$tmp" $index 2`"
 241                         goto_port="`getsel "$tmp" $index 4`"
 242                         goto_mode="`getsel "$tmp" $index 1 | cut -c1`"
 243                         echo "Digging to [$goto_server:$goto_port] $index [$goto_sel]..."
 244                         sh "$0" "$goto_server:$goto_port/$goto_mode/$goto_sel"
 245                         [ $? = 255 ] && exit 255 # force-quit
 246                 fi
 247         done
 248 ;;
 249 7)
 250         read -p "Query: " SEARCH
 251         selQuery="$SELECTOR     $SEARCH"
 252
 253         exec sh "$0" "$SERVER" "$selQuery" "$PORT" 1
 254 ;;
 255 8)
 256         telnet -l "$SELECTOR" "$SERVER" "$PORT"
 257         read DUMMY
 258 ;;
 259 9)
 260         echo "<BINARY FILE>" | less
 261 ;;
 262 g|I)
 263         if img2aa --help >/dev/null 2>&1; then
 264                 img2aa --mode=DITHERING \
 265                         $INVERT \
 266                         --width=74 "$tmp" | less
 267         elif jp2a -h >/dev/null 2>&1; then
 268                 if convert -h >/dev/null 2>&1; then
 269                         convert "$tmp" "$tmp.jpg"
 270                         jp2a --border --chars=" .-+=o8#"\
 271                                 $INVERT \
 272                                 --width=74 "$tmp.jpg" | less
 273                 else
 274                         echo "required program not found to view images: convert" \
 275                                 | less
 276                 fi
 277         else
 278                 echo "required program not found to view images:" \
 279                         jp2a or img2aa | less
 280         fi
 281 ;;
 282 *)
 283         echo "unknwon selector mode: <$MODE>" | less
 284         exit 3
 285 ;;
 286 esac
 287