io-ii

   1 # wrapper script for ii irc client http://tools.suckless.org/ii
   2
   3
   4 II_DIR="$HOME/.cache/irc"
   5
   6
   7 #
   8 # Interactively prompt for a channel to connect to, and change the tail running.
   9 #
  10 channel()
  11 {
  12         stop
  13
  14         find . -mindepth 1 -type d | cut -c 3- | iomenu -p 'chan' -l 9 > channel
  15
  16         print_screen
  17
  18         IFS='' read -r channel < channel
  19         [ -f "$channel/out" ] && tail -f -n 0 "$channel/out" | print_lines &
  20 }
  21
  22
  23 #
  24 # Get channel name and kill associated "tail -f" instance.
  25 #
  26 stop()
  27 {
  28         read -r channel < channel
  29         pid="$(pgrep -f "tail -f -n 0 $channel/out")"
  30         [ "$pid" ] && kill -14 $pid
  31 }
  32
  33
  34 #
  35 # Read one character from /dev/tty in raw mode.
  36 #
  37 get_char()
  38 {
  39         stty -echo raw
  40         dd count=1 2> /dev/null
  41         stty sane
  42 }
  43
  44
  45 #
  46 # Manage characters typed by user.
  47 #
  48 input()
  49 {
  50         printf '' > input
  51
  52         print_prompt
  53
  54         while key="$(get_char)"
  55         do
  56                 case "$key" in
  57                 ( [[:print:]] )
  58                         printf %s "$key" >> input
  59                         ;;
  60
  61                 ( "$(printf '\020')" | "$(printf '\016')" )  # Ctrl-P  Ctrl-N
  62                         [ "$pid" ] && kill -9 "$pid"
  63                         channel
  64                         ;;
  65
  66                 ( "$(printf '\033')" | "$(printf '\003')" )  # Escape  Ctrl-C
  67                         exit 0
  68                         ;;
  69
  70                 ( "$(printf '\015')" )                       # Ctrl-M  Enter
  71                         IFS='' read -r channel < channel
  72                         sed 's/$/\n/' input > "$channel/in"
  73                         printf '' > input
  74                         ;;
  75
  76                 ( "$(printf '\025')" )                       # Ctrl-U
  77                         printf '' > input
  78                         ;;
  79
  80                 ( "$(printf '\027')" )                       # Ctrl-W
  81                         sed -i 's/[^ \t]* *$//' input
  82                         ;;
  83
  84                 ( "$(printf '\010')" | "$(printf '\177')" )  # Ctrl-H  Backspace
  85                         sed -i 's/.$//' input
  86                         ;;
  87
  88                 ( "$(printf '\014')" )                       # Ctrl-L
  89                         IFS='' read -r channel < channel
  90                         less "$channel/out"
  91                         print_screen
  92                         ;;
  93                 esac
  94
  95                 print_prompt
  96         done
  97 }
  98
  99
 100 #
 101 # Print a prompt with the current input
 102 #
 103 print_prompt()
 104 {
 105         size="$(stty -F /dev/tty size)"
 106
 107         IFS='' read -r channel < channel
 108         IFS='' read -r input   < input
 109
 110         width="$(((${#input} + ${#channel} + 4) - ${size#* }))"
 111
 112         if [ "$width" -gt 0 ]
 113         then
 114                 input="$(printf %s "$input" | cut -c "$width"- | tr -d '\n')"
 115         fi
 116
 117         printf '\r\033[K%s> %s' "$channel" "$input"
 118 }
 119
 120
 121 #
 122 # Update the buffer lines and prompt
 123 #
 124 print_screen()
 125 {
 126         size="$(stty -F /dev/tty size)"
 127
 128         printf '\033[H\033[J'
 129         stty sane
 130
 131         IFS='' read -r channel < channel
 132         [ -f "$channel/out" ] && tail -n "${size#* }" "$channel/out"
 133
 134         print_prompt
 135
 136         stty raw
 137 }
 138
 139
 140 #
 141 # Print lines after formatting them and update the prompt.
 142 #
 143 print_lines()
 144 {
 145         while IFS='' read -r line
 146         do
 147                 printf '\a\r\033[K%s\n' "$line"
 148                 print_prompt
 149         done
 150 }
 151
 152
 153 main()
 154 {
 155         mkdir -p "$II_DIR"
 156         cd "$II_DIR" || exit 1
 157         touch channel in
 158
 159         trap 'print_screen'    SIGWINCH
 160         trap 'stty sane; stop' EXIT
 161
 162         channel
 163         input
 164 }
 165
 166
 167 main "$@"