神奇，原來 Shell 腳本還能這麼玩！

用Shell實現俄羅斯方塊代碼

#!/bin/bash
# Tetris Game
#APP declaration
APP_NAME="${0##*[\/]}"
APP_VERSION="1.0"
#顏色定義
cRed=1
cGreen=2
cYellow=3
cBlue=4
cFuchsia=5
cCyan=6
cWhite=7
colorTable=($cRed $cGreen $cYellow $cBlue $cFuchsia $cCyan $cWhite)
#位置和大小
iLeft=3
iTop=2
((iTrayLeft = iLeft + 2))
((iTrayTop = iTop + 1))
((iTrayWidth = 10))
((iTrayHeight = 15))
#顏色設置
cBorder=$cGreen
cScore=$cFuchsia
cScoreValue=$cCyan
#控制信號
#改遊戲使用兩個進程，一個用於接收輸入，一個用於遊戲流程和顯示界面;
#當前者接收到上下左右等按鍵時，通過向後者發送signal的方式通知後者。
sigRotate=25
sigLeft=26
sigRight=27
sigDown=28
sigAllDown=29
sigExit=30
#七中不同的方塊的定義
#通過旋轉，每種方塊的顯示的樣式可能有幾種
box0=(0 0 0 1 1 0 1 1)
box1=(0 2 1 2 2 2 3 2 1 0 1 1 1 2 1 3)
box2=(0 0 0 1 1 1 1 2 0 1 1 0 1 1 2 0)
box3=(0 1 0 2 1 0 1 1 0 0 1 0 1 1 2 1)
box4=(0 1 0 2 1 1 2 1 1 0 1 1 1 2 2 2 0 1 1 1 2 0 2 1 0 0 1 0 1 1 1 2)
box5=(0 1 1 1 2 1 2 2 1 0 1 1 1 2 2 0 0 0 0 1 1 1 2 1 0 2 1 0 1 1 1 2)
box6=(0 1 1 1 1 2 2 1 1 0 1 1 1 2 2 1 0 1 1 0 1 1 2 1 0 1 1 0 1 1 1 2)
#所有其中方塊的定義都放到box變量中
box=(${box0[@]} ${box1[@]} ${box2[@]} ${box3[@]} ${box4[@]} ${box5[@]} ${box6[@]})
#各種方塊旋轉後可能的樣式數目
countBox=(1 2 2 2 4 4 4)
#各種方塊再box數組中的偏移
offsetBox=(0 1 3 5 7 11 15)
#每提高一個速度級需要積累的分數
iScoreEachLevel=50 #be greater than 7
#運行時數據
sig=0 #接收到的signal
iScore=0 #總分
iLevel=0 #速度級
boxNew=() #新下落的方塊的位置定義
cBoxNew=0 #新下落的方塊的顏色
iBoxNewType=0 #新下落的方塊的種類
iBoxNewRotate=0 #新下落的方塊的旋轉角度
boxCur=() #當前方塊的位置定義
cBoxCur=0 #當前方塊的顏色
iBoxCurType=0 #當前方塊的種類
iBoxCurRotate=0 #當前方塊的旋轉角度
boxCurX=-1 #當前方塊的x座標位置
boxCurY=-1 #當前方塊的y座標位置
iMap=() #背景方塊圖表
#初始化所有背景方塊為-1, 表示沒有方塊
for ((i = 0; i < iTrayHeight * iTrayWidth; i++)); do iMap[$i]=-1; done
#接收輸入的進程的主函數
function RunAsKeyReceiver()
{
 local pidDisplayer key aKey sig cESC sTTY
 pidDisplayer=$1
 aKey=(0 0 0)
 cESC=`echo -ne ""`
 cSpace=`echo -ne " "`
 #保存終端屬性。在read -s讀取終端鍵時，終端的屬性會被暫時改變。
 #如果在read -s時程序被不幸殺掉，可能會導致終端混亂，
 #需要在程序退出時恢復終端屬性。
 sTTY=`stty -g`
 #捕捉退出信號
 trap "MyExit;" INT TERM
 trap "MyExitNoSub;" $sigExit
 #隱藏光標
 echo -ne "[?25l"
 while :
 do
 #讀取輸入。注-s不回顯，-n讀到一個字符立即返回
 read -s -n 1 key
 aKey[0]=${aKey[1]}
 aKey[1]=${aKey[2]}
 aKey[2]=$key
 sig=0
 #判斷輸入了何種鍵
 if [[ $key == $cESC && ${aKey[1]} == $cESC ]]
 then
 #ESC鍵
 MyExit
 elif [[ ${aKey[0]} == $cESC && ${aKey[1]} == "[" ]]
 then
 if [[ $key == "A" ]]; then sig=$sigRotate #
 elif [[ $key == "B" ]]; then sig=$sigDown #
 elif [[ $key == "D" ]]; then sig=$sigLeft #
 elif [[ $key == "C" ]]; then sig=$sigRight #
 fi
 elif [[ $key == "W" || $key == "w" ]]; then sig=$sigRotate #W, w
 elif [[ $key == "S" || $key == "s" ]]; then sig=$sigDown #S, s
 elif [[ $key == "A" || $key == "a" ]]; then sig=$sigLeft #A, a
 elif [[ $key == "D" || $key == "d" ]]; then sig=$sigRight #D, d
 elif [[ "[$key]" == "[]" ]]; then sig=$sigAllDown #空格鍵
 elif [[ $key == "Q" || $key == "q" ]] #Q, q
 then
 MyExit
 fi
 if [[ $sig != 0 ]]
 then
 #向另一進程發送消息
 kill -$sig $pidDisplayer
 fi
 done
}
#退出前的恢復
function MyExitNoSub()
{
 local y
 #恢復終端屬性
 stty $sTTY
 ((y = iTop + iTrayHeight + 4))
 #顯示光標
 echo -e "[?25h[${y};0H"
 exit
}
function MyExit()
{
 #通知顯示進程需要退出
 kill -$sigExit $pidDisplayer
 MyExitNoSub
}
#處理顯示和遊戲流程的主函數
function RunAsDisplayer()
{
 local sigThis
 InitDraw
 #掛載各種信號的處理函數
 trap "sig=$sigRotate;" $sigRotate
 trap "sig=$sigLeft;" $sigLeft
 trap "sig=$sigRight;" $sigRight
 trap "sig=$sigDown;" $sigDown
 trap "sig=$sigAllDown;" $sigAllDown
 trap "ShowExit;" $sigExit
 while :
 do
 #根據當前的速度級iLevel不同，設定相應的循環的次數
 for ((i = 0; i  
< 21 - iLevel; i++))
 do
 sleep 0.02
 sigThis=$sig
 sig=0
 #根據sig變量判斷是否接受到相應的信號
 if ((sigThis == sigRotate)); then BoxRotate; #旋轉
 elif ((sigThis == sigLeft)); then BoxLeft; #左移一列
 elif ((sigThis == sigRight)); then BoxRight; #右移一列
 elif ((sigThis == sigDown)); then BoxDown; #下落一行
 elif ((sigThis == sigAllDown)); then BoxAllDown; #下落到底
 fi
 done
 #kill -$sigDown $$
 BoxDown #下落一行
 done
}
#BoxMove(y, x), 測試是否可以把移動中的方塊移到(x, y)的位置, 返回0則可以, 1不可以
function BoxMove()
{
 local j i x y xTest yTest
 yTest=$1
 xTest=$2
 for ((j = 0; j < 8; j += 2))
 do
 ((i = j + 1))
 ((y = ${boxCur[$j]} + yTest))
 ((x = ${boxCur[$i]} + xTest))
 if (( y < 0 || y >= iTrayHeight || x < 0 || x >= iTrayWidth))
 then
 #撞到牆壁了
 return 1
 fi
 if ((${iMap[y * iTrayWidth + x]} != -1 ))
 then
 #撞到其他已經存在的方塊了
 return 1
 fi
 done
 return 0;
}
#將當前移動中的方塊放到背景方塊中去,
#並計算新的分數和速度級。(即一次方塊落到底部)
function Box2Map()
{
 local j i x y xp yp line
 #將當前移動中的方塊放到背景方塊中去
 for ((j = 0; j < 8; j += 2))
 do
 ((i = j + 1))
 ((y = ${boxCur[$j]} + boxCurY))
 ((x = ${boxCur[$i]} + boxCurX))
 ((i = y * iTrayWidth + x))
 iMap[$i]=$cBoxCur
 done
 #消去可被消去的行
 line=0
 for ((j = 0; j < iTrayWidth * iTrayHeight; j += iTrayWidth))
 do
 for ((i = j + iTrayWidth - 1; i >= j; i--))
 do
 if ((${iMap[$i]} == -1)); then break; fi
 done
 if ((i >= j)); then continue; fi
 ((line++))
 for ((i = j - 1; i >= 0; i--))
 do
 ((x = i + iTrayWidth))
 iMap[$x]=${iMap[$i]}
 done
 for ((i = 0; i < iTrayWidth; i++))
 do
 iMap[$i]=-1
 done
 done
 if ((line == 0)); then return; fi
 #根據消去的行數line計算分數和速度級
 ((x = iLeft + iTrayWidth * 2 + 7))
 ((y = iTop + 11))
 ((iScore += line * 2 - 1))
 #顯示新的分數
 echo -ne "[1m[3${cScoreValue}m[${y};${x}H${iScore} "
 if ((iScore % iScoreEachLevel < line * 2 - 1))
 then
 if ((iLevel < 20))
 then
 ((iLevel++))
 ((y = iTop + 14))
 #顯示新的速度級
 echo -ne "[3${cScoreValue}m[${y};${x}H${iLevel} "
 fi
 fi
 echo -ne "[0m"
 #重新顯示背景方塊
 for ((y = 0; y < iTrayHeight; y++))
 do
 ((yp = y + iTrayTop + 1))
 ((xp = iTrayLeft + 1))
 ((i = y * iTrayWidth))
 echo -ne "[${yp};${xp}H"
 for ((x = 0; x < iTrayWidth; x++))
 do
 ((j = i + x))
 if ((${iMap[$j]} == -1))
 then
 echo -ne " "
 else
 echo -ne "[1m[7m[3${iMap[$j]}m[4${iMap[$j]}m[][0m"
 fi
 done
 done
}
#下落一行
function BoxDown()
{
 local y s
 ((y = boxCurY + 1)) #新的y座標
 if BoxMove $y $boxCurX #測試是否可以下落一行
 then
 s="`DrawCurBox 0`" #將舊的方塊抹去
 ((boxCurY = y))
 s="$s`DrawCurBox 1`" #顯示新的下落後方塊
 echo -ne $s
 else
 #走到這兒, 如果不能下落了
 Box2Map #將當前移動中的方塊貼到背景方塊中
 RandomBox #產生新的方塊
 fi
}
#左移一列
function BoxLeft()
{
 local x s
 ((x = boxCurX - 1))
 if BoxMove $boxCurY $x
 then
 s=`DrawCurBox 0`
 ((boxCurX = x))
 s=$s`DrawCurBox 1`
 echo -ne $s
 fi
}
#右移一列
function BoxRight()
{
 local x s
 ((x = boxCurX + 1))
 if BoxMove $boxCurY $x
 then
 s=`DrawCurBox 0`
 ((boxCurX = x))
 s=$s`DrawCurBox 1`
 echo -ne $s
 fi
}
#下落到底
function BoxAllDown()
{
 local k j i x y iDown s
 iDown=$iTrayHeight
 #計算一共需要下落多少行
 for ((j = 0; j < 8; j += 2))
 do
 ((i = j + 1))
 ((y = ${boxCur[$j]} + boxCurY))
 ((x = ${boxCur[$i]} + boxCurX))
 for ((k = y + 1; k < iTrayHeight; k++))
 do
 ((i = k * iTrayWidth + x))
 if (( ${iMap[$i]} != -1)); then break; fi
 done
 ((k -= y + 1))
 if (( $iDown > $k )); then iDown=$k; fi
 done
 s=`DrawCurBox 0` #將舊的方塊抹去
 ((boxCurY += iDown))
 s=$s`DrawCurBox 1` #顯示新的下落後的方塊
 echo -ne $s
 Box2Map #將當前移動中的方塊貼到背景方塊中
 RandomBox #產生新的方塊
}
#旋轉方塊
function BoxRotate()
{
 local iCount iTestRotate boxTest j i s
 iCount=${countBox[$iBoxCurType]} #當前的方塊經旋轉可以產生的樣式的數目
 #計算旋轉後的新的樣式
 ((iTestRotate = iBoxCurRotate + 1))
 if ((iTestRotate >= iCount))
 then
 ((iTestRotate = 0))
 fi
 #更新到新的樣式, 保存老的樣式(但不顯示)
 for ((j = 0, i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * 8; j < 8; j++, i++))
 do
 boxTest[$j]=${boxCur[$j]}
 boxCur[$j]=${box[$i]}
 done
 if BoxMove $boxCurY $boxCurX #測試旋轉後是否有空間放的下
 then
 #抹去舊的方塊
 for ((j = 0; j  
< 8; j++))
 do
 boxCur[$j]=${boxTest[$j]}
 done
 s=`DrawCurBox 0`
 #畫上新的方塊
 for ((j = 0, i = (${offsetBox[$iBoxCurType]} + $iTestRotate) * 8; j < 8; j++, i++))
 do
 boxCur[$j]=${box[$i]}
 done
 s=$s`DrawCurBox 1`
 echo -ne $s
 iBoxCurRotate=$iTestRotate
 else
 #不能旋轉，還是繼續使用老的樣式
 for ((j = 0; j < 8; j++))
 do
 boxCur[$j]=${boxTest[$j]}
 done
 fi
}
#DrawCurBox(bDraw), 繪製當前移動中的方塊, bDraw為1, 畫上, bDraw為0, 抹去方塊。
function DrawCurBox()
{
 local i j t bDraw sBox s
 bDraw=$1
 s=""
 if (( bDraw == 0 ))
 then
 sBox=" "
 else
 sBox="[]"
 s=$s"[1m[7m[3${cBoxCur}m[4${cBoxCur}m"
 fi
 for ((j = 0; j < 8; j += 2))
 do
 ((i = iTrayTop + 1 + ${boxCur[$j]} + boxCurY))
 ((t = iTrayLeft + 1 + 2 * (boxCurX + ${boxCur[$j + 1]})))
 #[y;xH, 光標到(x, y)處
 s=$s"[${i};${t}H${sBox}"
 done
 s=$s"[0m"
 echo -n $s
}
#更新新的方塊
function RandomBox()
{
 local i j t
 #更新當前移動的方塊
 iBoxCurType=${iBoxNewType}
 iBoxCurRotate=${iBoxNewRotate}
 cBoxCur=${cBoxNew}
 for ((j = 0; j < ${#boxNew[@]}; j++))
 do
 boxCur[$j]=${boxNew[$j]}
 done
 #顯示當前移動的方塊
 if (( ${#boxCur[@]} == 8 ))
 then
 #計算當前方塊該從頂端哪一行"冒"出來
 for ((j = 0, t = 4; j < 8; j += 2))
 do
 if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
 done
 ((boxCurY = -t))
 for ((j = 1, i = -4, t = 20; j < 8; j += 2))
 do
 if ((${boxCur[$j]} > i)); then i=${boxCur[$j]}; fi
 if ((${boxCur[$j]} < t)); then t=${boxCur[$j]}; fi
 done
 ((boxCurX = (iTrayWidth - 1 - i - t) / 2))
 #顯示當前移動的方塊
 echo -ne `DrawCurBox 1`
 #如果方塊一出來就沒處放，Game over!
 if ! BoxMove $boxCurY $boxCurX
 then
 kill -$sigExit ${PPID}
 ShowExit
 fi
 fi
 #清除右邊預顯示的方塊
 for ((j = 0; j < 4; j++))
 do
 ((i = iTop + 1 + j))
 ((t = iLeft + 2 * iTrayWidth + 7))
 echo -ne "[${i};${t}H "
 done
 #隨機產生新的方塊
 ((iBoxNewType = RANDOM % ${#offsetBox[@]}))
 ((iBoxNewRotate = RANDOM % ${countBox[$iBoxNewType]}))
 for ((j = 0, i = (${offsetBox[$iBoxNewType]} + $iBoxNewRotate) * 8; j < 8; j++, i++))
 do
 boxNew[$j]=${box[$i]};
 done
 ((cBoxNew = ${colorTable[RANDOM % ${#colorTable[@]}]}))
 #顯示右邊預顯示的方塊
 echo -ne "[1m[7m[3${cBoxNew}m[4${cBoxNew}m"
 for ((j = 0; j < 8; j += 2))
 do
 ((i = iTop + 1 + ${boxNew[$j]}))
 ((t = iLeft + 2 * iTrayWidth + 7 + 2 * ${boxNew[$j + 1]}))
 echo -ne "[${i};${t}H[]"
 done
 echo -ne "[0m"
}
#初始繪製
function InitDraw()
{
 clear
 RandomBox #隨機產生方塊，這時右邊預顯示窗口中有方快了
 RandomBox #再隨機產生方塊，右邊預顯示窗口中的方塊被更新，原先的方塊將開始下落
 local i t1 t2 t3
 #顯示邊框
 echo -ne "[1m"
 echo -ne "[3${cBorder}m[4${cBorder}m"
 ((t2 = iLeft + 1))
 ((t3 = iLeft + iTrayWidth * 2 + 3))
 for ((i = 0; i < iTrayHeight; i++))
 do
 ((t1 = i + iTop + 2))
 echo -ne "[${t1};${t2}H||"
 echo -ne "[${t1};${t3}H||"
 done
 ((t2 = iTop + iTrayHeight + 2))
 for ((i = 0; i < iTrayWidth + 2; i++))
 do
 ((t1 = i * 2 + iLeft + 1))
 echo -ne "[${iTrayTop};${t1}H=="
 echo -ne "[${t2};${t1}H=="
 done
 echo -ne "[0m"
 #顯示"Score"和"Level"字樣
 echo -ne "[1m"
 ((t1 = iLeft + iTrayWidth * 2 + 7))
 ((t2 = iTop + 10))
 echo -ne "[3${cScore}m[${t2};${t1}HScore"
 ((t2 = iTop + 11))
 echo -ne "[3${cScoreValue}m[${t2};${t1}H${iScore}"
 ((t2 = iTop + 13))
 echo -ne "[3${cScore}m[${t2};${t1}HLevel"
 ((t2 = iTop + 14))
 echo -ne "[3${cScoreValue}m[${t2};${t1}H${iLevel}"
 echo -ne "[0m"
}
#退出時顯示GameOVer!
function ShowExit()
{
 local y
 ((y = iTrayHeight + iTrayTop + 3))
 echo -e "[${y};0HGameOver![0m"
 exit
}
#顯示用法.
function Usage
{
 cat << EOF
Usage: $APP_NAME
Start tetris game.
 -h, --help display this help and exit
 --version output version information and exit
EOF
}
#遊戲主程序在這兒開始.
if [[ "$1" == "-h" || "$1" == "--help" ]]; then
 Usage
elif [[ "$1" == "--version" ]]; then
 echo "$APP_NAME $APP_VERSION"
elif [[ "$1" == "--show" ]]; then
 #當發現具有參數--show時，運行顯示函數
 RunAsDisplayer
else
 bash $0 --show& #以參數--show將本程序再運行一遍
 RunAsKeyReceiver $! #以上一行產生的進程的進程號作為參數
fi

最終的效果圖如下