APT风格的进度条(不中断正常输出)

编辑:更新版本检查我的github页面

我对这个问题的回答不满意。我个人想要的是一个花哨的进度条，就像APT看到的那样。

我查看了APT的C源代码，并决定为bash编写自己的等效代码。

这个进度条将很好地停留在终端的底部，不会干扰发送到终端的任何输出。

请注意，该栏目前固定在100字符宽。如果你想把它缩放到终端的大小，这也很容易实现(我的github页面上的更新版本处理得很好)。

我将在这里发布我的脚本。 使用的例子:

source ./progress_bar.sh
echo "This is some output"
setup_scroll_area
sleep 1
echo "This is some output 2"
draw_progress_bar 10
sleep 1
echo "This is some output 3"
draw_progress_bar 50
sleep 1
echo "This is some output 4"
draw_progress_bar 90
sleep 1
echo "This is some output 5"
destroy_scroll_area

脚本(我强烈推荐我的github上的版本):

#!/bin/bash

# This code was inspired by the open source C code of the APT progress bar
# http://bazaar.launchpad.net/~ubuntu-branches/ubuntu/trusty/apt/trusty/view/head:/apt-pkg/install-progress.cc#L233

#
# Usage:
# Source this script
# setup_scroll_area
# draw_progress_bar 10
# draw_progress_bar 90
# destroy_scroll_area
#


CODE_SAVE_CURSOR="\033[s"
CODE_RESTORE_CURSOR="\033[u"
CODE_CURSOR_IN_SCROLL_AREA="\033[1A"
COLOR_FG="\e[30m"
COLOR_BG="\e[42m"
RESTORE_FG="\e[39m"
RESTORE_BG="\e[49m"

function setup_scroll_area() {
    lines=$(tput lines)
    let lines=$lines-1
    # Scroll down a bit to avoid visual glitch when the screen area shrinks by one row
    echo -en "\n"

    # Save cursor
    echo -en "$CODE_SAVE_CURSOR"
    # Set scroll region (this will place the cursor in the top left)
    echo -en "\033[0;${lines}r"

    # Restore cursor but ensure its inside the scrolling area
    echo -en "$CODE_RESTORE_CURSOR"
    echo -en "$CODE_CURSOR_IN_SCROLL_AREA"

    # Start empty progress bar
    draw_progress_bar 0
}

function destroy_scroll_area() {
    lines=$(tput lines)
    # Save cursor
    echo -en "$CODE_SAVE_CURSOR"
    # Set scroll region (this will place the cursor in the top left)
    echo -en "\033[0;${lines}r"

    # Restore cursor but ensure its inside the scrolling area
    echo -en "$CODE_RESTORE_CURSOR"
    echo -en "$CODE_CURSOR_IN_SCROLL_AREA"

    # We are done so clear the scroll bar
    clear_progress_bar

    # Scroll down a bit to avoid visual glitch when the screen area grows by one row
    echo -en "\n\n"
}

function draw_progress_bar() {
    percentage=$1
    lines=$(tput lines)
    let lines=$lines
    # Save cursor
    echo -en "$CODE_SAVE_CURSOR"

    # Move cursor position to last row
    echo -en "\033[${lines};0f"

    # Clear progress bar
    tput el

    # Draw progress bar
    print_bar_text $percentage

    # Restore cursor position
    echo -en "$CODE_RESTORE_CURSOR"
}

function clear_progress_bar() {
    lines=$(tput lines)
    let lines=$lines
    # Save cursor
    echo -en "$CODE_SAVE_CURSOR"

    # Move cursor position to last row
    echo -en "\033[${lines};0f"

    # clear progress bar
    tput el

    # Restore cursor position
    echo -en "$CODE_RESTORE_CURSOR"
}

function print_bar_text() {
    local percentage=$1

    # Prepare progress bar
    let remainder=100-$percentage
    progress_bar=$(echo -ne "["; echo -en "${COLOR_FG}${COLOR_BG}"; printf_new "#" $percentage; echo -en "${RESTORE_FG}${RESTORE_BG}"; printf_new "." $remainder; echo -ne "]");

    # Print progress bar
    if [ $1 -gt 99 ]
    then
        echo -ne "${progress_bar}"
    else
        echo -ne "${progress_bar}"
    fi
}

printf_new() {
    str=$1
    num=$2
    v=$(printf "%-${num}s" "$str")
    echo -ne "${v// /$str}"
}

这可以让你看到命令仍在执行:

while :;do echo -n .;sleep 1;done &
trap "kill $!" EXIT  #Die with parent if we die prematurely
tar zxf packages.tar.gz; # or any other command here
kill $! && trap " " EXIT #Kill the loop and unset the trap or else the pid might get reassigned and we might end up killing a completely different process

这将创建一个无限while循环，在后台执行，并每秒回显一个"."。这将显示出来。在壳里。运行tar命令或任何您需要的命令。当该命令执行完毕时，终止在后台运行的最后一个作业——即无限while循环。

#!/bin/bash
tot=$(wc -c /proc/$$/fd/255 | awk '/ /{print $1}')
now() {
echo $(( 100* ($(awk '/^pos:/{print $2}' < /proc/$$/fdinfo/255)-166) / (tot-166) )) "%"
}
now;
now;
now;
now;
now;
now;
now;
now;
now;

输出:

0 %
12 %
25 %
37 %
50 %
62 %
75 %
87 %
100 %

注意:如果你输入1而不是255，你将在…2的标准输出(但您必须修改源代码，将“tot”设置为预计输出文件大小)

根据上面列出的建议，我决定实现自己的进度条。

#!/usr/bin/env bash

main() {
  for (( i = 0; i <= 100; i=$i + 1)); do
    progress_bar "$i"
    sleep 0.1;
  done
  progress_bar "done"
  exit 0
}

progress_bar() {
  if [ "$1" == "done" ]; then
    spinner="X"
    percent_done="100"
    progress_message="Done!"
    new_line="\n"
  else
    spinner='/-\|'
    percent_done="${1:-0}"
    progress_message="$percent_done %"
  fi

  percent_none="$(( 100 - $percent_done ))"
  [ "$percent_done" -gt 0 ] && local done_bar="$(printf '#%.0s' $(seq -s ' ' 1 $percent_done))"
  [ "$percent_none" -gt 0 ] && local none_bar="$(printf '~%.0s' $(seq -s ' ' 1 $percent_none))"

  # print the progress bar to the screen
  printf "\r Progress: [%s%s] %s %s${new_line}" \
    "$done_bar" \
    "$none_bar" \
    "${spinner:x++%${#spinner}:1}" \
    "$progress_message"
}

main "$@"

这是它看起来的样子

上传文件

[##################################################] 100% (137921 / 137921 bytes)

等待一项工作完成

[#########################                         ] 50% (15 / 30 seconds)

实现它的简单函数

你可以复制粘贴到你的脚本。它不需要任何其他东西来工作。

PROGRESS_BAR_WIDTH=50  # progress bar length in characters

draw_progress_bar() {
  # Arguments: current value, max value, unit of measurement (optional)
  local __value=$1
  local __max=$2
  local __unit=${3:-""}  # if unit is not supplied, do not display it

  # Calculate percentage
  if (( $__max < 1 )); then __max=1; fi  # anti zero division protection
  local __percentage=$(( 100 - ($__max*100 - $__value*100) / $__max ))

  # Rescale the bar according to the progress bar width
  local __num_bar=$(( $__percentage * $PROGRESS_BAR_WIDTH / 100 ))

  # Draw progress bar
  printf "["
  for b in $(seq 1 $__num_bar); do printf "#"; done
  for s in $(seq 1 $(( $PROGRESS_BAR_WIDTH - $__num_bar ))); do printf " "; done
  printf "] $__percentage%% ($__value / $__max $__unit)\r"
}

使用的例子

在这里，我们上传一个文件，并在每次迭代时重新绘制进度条。只要我们能得到两个值:最大值和当前值，实际执行的作业是什么并不重要。

在下面的例子中，最大值是file_size，当前值由某个名为uploaded_bytes的函数提供。

# Uploading a file
file_size=137921

while true; do
  # Get current value of uploaded bytes
  uploaded_bytes=$(some_function_that_reports_progress)

  # Draw a progress bar
  draw_progress_bar $uploaded_bytes $file_size "bytes"

  # Check if we reached 100%
  if [ $uploaded_bytes == $file_size ]; then break; fi
  sleep 1  # Wait before redrawing
done
# Go to the newline at the end of upload
printf "\n"

使用Linux命令pv。

如果它在管道中间，它不知道大小，但它给出了速度和总数，从那里你可以计算出它需要多长时间，并得到反馈，这样你就知道它没有挂起。