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  1. #!/bin/bash
  2. list=( {a..z} )
  3. init(){
  4.   MIN_INDEX=0
  5.   MAX_INDEX=$(( ${#list[@]} - 1 ))
  6.   ITEM_NUM=${#list[@]}
  7.   PAGE_SIZE=10
  8.   PAGE_WIDTH=10
  9.   PAGE_NUM=$(( ( MAX_INDEX % PAGE_SIZE ) ? MAX_INDEX / PAGE_SIZE + 1: MAX_INDEX / PAGE_SIZE ))
  10.   BAR_LEN=$(( (PAGE_SIZE - 2) / PAGE_NUM ))
  11.   (( BAR_LEN <= 0 )) && BAR_LEN=1
  12.   index=0
  13. }
  14.  
  15. draw(){
  16.   local i page_index page_start page_end bar_len bar_start
  17.   tput cup 0 0
  18.   (( page_index = index / PAGE_SIZE ))
  19.  
  20.   (( page_start = page_index*PAGE_SIZE ))
  21.   (( page_end = page_start + PAGE_SIZE - 1 ))
  22.  
  23.   (( bar_start = page_index * (PAGE_SIZE - 2) /PAGE_NUM ))
  24.  
  25.   printf "index=%2d, page_index=%2d, bar_len=%2d, bar_start=%2d\n" $index $page_index $BAR_LEN $bar_start
  26.  
  27.   for (( i=page_start; i <=page_end; ++i ))
  28.   do
  29.     (( i == index )) && echo -ne "\033[1;37;44m"
  30.     printf "%-${PAGE_WIDTH}s" "${list[$i]}"
  31.  
  32.     if (( i == page_start )) ; then
  33.       echo -e "\033[${PAGE_WIDTH}G\033[1;30;47m\0342\0226\0262\033[m"
  34.     elif (( i == page_end )) ; then
  35.       echo -e "\033[${PAGE_WIDTH}G\033[1;30;47m\0342\0226\0274\033[m"
  36.     elif (( i >= page_start + bar_start + 1 && i <= page_start + bar_start + BAR_LEN + 1)) ; then
  37.       echo -e "\033[${PAGE_WIDTH}G\033[1;44m \033[m"
  38.     else
  39.       echo -e "\033[${PAGE_WIDTH}G\033[1;47m \033[m"
  40.     fi
  41.   done
  42. }
  43. input(){
  44.   echo -ne "\033[?25l"
  45.   aKey=(0 0 0 0)
  46.   cESC=`echo -ne "\033"`
  47.   while :
  48.   do
  49.     read -s -n 1 key
  50.     aKey=( "${aKey[@]:1}" "$key")
  51.  
  52.     if [[ $key${aKey[2]} = $cESC$cESC ]] ; then break
  53.     elif [[ "${aKey[@]:1:2}$key" = "${cESC} [A" ]] ; then (( --index ))
  54.     elif [[ "${aKey[@]:1:2}$key" = "${cESC} [B" ]] ; then (( ++index ))
  55.     elif [[ "${aKey[@]}" = "${cESC} [ 5 ~" ]] ; then (( index-=PAGE_SIZE ))
  56.     elif [[ "${aKey[@]}" = "${cESC} [ 6 ~" ]] ; then (( index+=PAGE_SIZE ))
  57.     else continue
  58.     fi
  59.  
  60.     if (( index < MIN_INDEX )) ; then index=$MIN_INDEX
  61.     elif (( index > MAX_INDEX )) ; then index=$MAX_INDEX
  62.     fi
  63.  
  64.     draw $INDEX
  65.  
  66.   done
  67.   echo -ne "\033[?25h"
  68. }
  69. clear
  70. init
  71. draw
  72. input
  73.  
  74.  
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https://ideone.com/hkz4Q
language:
Bash (bash 5.0.3)
created:
11 years ago
visibility:
public

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