slowtype

slowtype

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+#!/bin/bash
+# slowtype - type text documents slowly
+
+nonstopmode=""
+file=""
+
+hotkeys_usage(){
+ echo " Interactive keys:" >&2
+ echo "  SPACE - Pause/Continue" >&2
+ echo "  ENTER - Print all until next paragraph" >&2
+ echo "  ?     - help" >&2
+ echo "  c     - clear screen" >&2
+ echo "  n     - toggle Nonstop mode (pausing at paragraph end)" >&2
+ echo "  q     - finish current line and quit" >&2
+}
+
+usage(){
+ echo "Usage: $0 [options] filename" >&2
+ echo " Typewriting source code with syntax highlighting" >&2
+ echo " (C) Klaus Knopper 2012, License: GPL V2" >&2
+ echo "" >&2
+ echo "Options:" >&2
+ echo "  -h    - help" >&2
+ echo "  -c    - clear screen first" >&2
+ echo "  -n    - nonstop mode (don't stop at paragraph)" >&2
+ echo "" >&2
+ hotkeys_usage
+}
+
+# Split options vs. files
+for arg in "$@"; do
+ case "$arg" in
+  -c) clear ;;
+  -n) nonstopmode=true ;;
+  -h|--help|-\?) usage; exit 0 ;;
+   *) [ -r "$arg" ] && file="$arg" || { usage ; exit 1; } ;;
+ esac
+done
+ 
+if [ ! -r "$file" ]; then
+ usage
+ exit 1
+fi
+
+# 0.0$sleepvalue
+usleepchar="5000"
+usleepspace="5000"
+usleepline="5000"
+usleeppar="5000"
+
+charmode="true"
+linemode=""
+parmode=""
+
+KEY=""
+ACTION=""
+
+trap bailout 1 2 3 10 15
+
+bailout(){
+ stty echo >/dev/tty </dev/tty
+ exit $1
+}
+
+evalkey(){
+ if [ x"$KEY" = x"" ]; then # Return: print all till next paragraph
+  ACTION=next; nonstopmode=""
+ else
+  case x"$KEY" in
+    x[qQ]) ACTION="quit" ;;
+    x[nN]) [ -n "$nonstopmode" ] && nonstopmode="" || nonstopmode="true" ;;
+    x[cC]) ACTION="clear" ;;
+    x\?)   ACTION="help" ;;
+  esac
+ fi
+}
+
+waitforkey(){
+ while true; do IFS='' read -r -n 1 -s -t "0.25" KEY && break; done </dev/tty
+}
+
+# waitforkey timeout
+readkey(){
+ local t="$1"
+ ACTION=""
+ if IFS='' read -r -n 1 -s -t "$t" KEY </dev/tty; then
+  if [ x"$KEY" = x" " ]; then # Space: Wait for any key
+   nonstopmode=""
+   waitforkey
+  fi
+  evalkey
+ fi
+}
+
+delay(){
+ local d=0
+ if [ 0 -le "$1" ] 2>/dev/null; then
+  let d=$RANDOM%5000+$1
+ else
+  [ -n "$charmode" ] && let d+="$usleepchar"
+  [ -n "$linemode" ] && let d+="$usleepline"
+  [ -n "$parmode" ]  && let d+="$usleeppar"
+  let d+=$RANDOM%5000
+ fi
+ readkey "0.0$d"
+}
+
+### MAIN
+
+stty -echo
+while IFS='' read -r line; do
+ if [ -z "$nonstopmode" -a -z "$line" ]; then
+  ACTION=""
+  waitforkey
+  evalkey
+ fi
+ l="$line"
+ while [ -n "$l" ]; do
+  echo -n "${l:0:1}"
+  l="${l#?}"
+  [ -n "$ACTION" ] || delay
+ done
+ echo ""
+ case x"$ACTION" in
+  xquit) bailout 0 ;;
+  xhelp) hotkeys_usage; ACTION=""; waitforkey; evalkey;; 
+  xclear) echo -n -e "\033[H\033[J"; ACTION=""; waitforkey; evalkey;;
+ esac
+done <<.
+$(highlight -O ansi "$file" | tr -d '\r')
+.
+
+bailout 0