问题描述
我正在编写自己的脚本来使用 wget 下载多个项目(同时，每个命令一个项目)，我需要一个进度条。我目前使用 zenity --progress 作为我的进度条，但问题是它在下载时会产生多个进度条。
我想要实现的是类似于 Nautilus 中的文件传输对话框：
任何人都可以向我指出正确的方向，哪些程序或语言将实现这一目标。
注意：我只有 shell 脚本的基本知识，其他的不多。
最佳思路
使用 YAD 的解决方案
概述
Zenity 好久没有更新了。幸运的是，有一个名为 YAD 的分叉，具有许多附加功能。它尚未到达官方存储库，但您可以从 webupd8 PPA 安装它：
sudo add-apt-repository ppa:webupd8team/y-ppa-manager
sudo apt-get update
sudo apt-get install yad
添加到 YAD 的功能之一是多 progress-bar 对话框。以下是 YAD 手册中有关多个进度条的摘录：
Multi progress bars dialog options
--bar=LABEL[:TYPE]
Add progress bar. LABEL is a text label for progress bar. TYPE is a progress bar type. Types are:
NORM for normal progress bar, RTL for inverted progress bar and PULSE for pulsate progress bar.
--vertical
Set vertical orientation of progress bars.
--align=TYPE
Set alignment of bar labels. Possible types are left, center or right. Default is left.
Initial values for bars set as extra arguments. Each lines with progress data passed to stdin must be started
from N: where N is a number of progress bar. Rest is the same as in progress dialog.
因此，一个非常简单的带有多个进度条的脚本可能如下所示：
for i in {1..100}; do
printf "1:$i\n2:$i\n3:$i\n"
sleep 0.2
done | yad --multi-progress --bar="Bar 1":NORM --bar="Bar 2":NORM --bar="Bar 3":NORM
这就是结果的样子：
我们可以使用 # 为条形添加描述：
for i in {1..100}; do
printf "1:$i\n2:$i\n3:$i\n"
printf "1:#Progress 1 is at $i percent\n2:#Progress 2 is at $i percent\n3:#Progress 3 is at $i percent\n"
sleep 0.2
done | yad --multi-progress --bar="Bar 1":NORM --bar="Bar 2":NORM --bar="Bar 3":NORM
结果：
如果我们想在 wget 下载脚本中实现这一点，我们必须先做一些事情：
-
找到一种方法从 wget 输出中提取下载进度和其他有趣的数据
-
找到迭代多个文件的方法
-
找到一种方法将我们拥有的所有信息传递给一个单独的对话
我发现这个项目很有趣，所以我坐下来编写了一个脚本，可以完成上述所有操作。
yad_wget
这是我想出的：
#!/bin/bash
# NAME: yad_wget
# VERSION: 0.2
# AUTHOR: (c) 2014 Glutanimate
# DESCRIPTION: graphical frontend to wget in form of a yad script
# FEATURES: - display progress of multiple simultaneous downloads
# - set maximum number of simultaneous downloads
# DEPENDENCIES: yad
#
# Install yad on Ubuntu with:
#
# sudo add-apt-repository ppa:webupd8team/y-ppa-manager
# sudo apt-get update
# sudo apt-get install yad
#
# LICENSE: GNU GPLv3 (http://www.gnu.de/documents/gpl-3.0.en.html)
#
# NOTICE: THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY APPLICABLE LAW.
# EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES
# PROVIDE THE PROGRAM “AS IS” WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR
# IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND
# PERFORMANCE OF THE PROGRAM IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE,
# YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
#
# IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY
# COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS THE PROGRAM AS
# PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL,
# INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE
# THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED
# INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE
# PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
# PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
#
# USAGE: yad_wget <space-delimited URLs>
# Closing the yad dialog will terminate all downloads in progress
# Variables and settings
MAXDLS="5" # set maximum number of simultaneous downloads
URILIST="$@" # gets list of URIs from stdin
USAGE="$0 <space-delimited URLs>"
# Set GUI variables up
TITLE="YAD wget downloader" # dialog title
TEXT="<b>Downloads</b> in progress:" # dialog text
ICON="emblem-downloads" # window icon (appears in launcher)
IMAGE="browser-download" # window image (appears in dialog)
#URILIST="http://proof.ovh.net/files/100Mb.dat http://speedtest.wdc01.softlayer.com/downloads/test10.zip http://cachefly.cachefly.net/100mb.test"
# Usage checks
if [[ -z "$URILIST" ]]
then
echo "Error: No arguments provided"
echo "Usage: $USAGE"
exit 1
fi
# download file and extract progress, speed and ETA from wget
# we use sed regex for this
# source: http://ubuntuforums.org/showthread.php?t=306515&page=2&p=7455412#post7455412
# modified to work with different locales and decimal point conventions
download(){
wget "$1" 2>&1 | sed -u \
"s/.* \([0-9]\+%\)\ \+\([0-9,.]\+.\) \(.*\)/$2:\1\n$2:# Downloading at \2\/s, ETA \3/"
RET_WGET="${PIPESTATUS[0]}" # get return code of wget
if [[ "$RET_WGET" = 0 ]] # check return code for errors
then
echo "$2:100%"
echo "$2:#Download completed."
else
echo "$2:#Download error."
fi
}
# compose list of bars for yad
for URI in $URILIST; do # iterate through all URIs
FILENAME="${URI##*/}" # extract last field of URI as filename
YADBARS="$YADBARS --bar=$FILENAME:NORM" # add filename to the list of URIs
done
IFS=" "
COUNTER="1"
DYNAMIC_COUNTER="1"
# main
# iterate through all URIs, download them in the background and
# pipe all output simultaneously to yad
# source: http://pastebin.com/yBL2wjaY
for URI in $URILIST; do
if [[ "$DYNAMIC_COUNTER" = "$MAXDLS" ]] # only download n files at a time
then
download "$URI" "$COUNTER" # if limit reached wait until wget complete
DYNAMIC_COUNTER="1" # before proceeding (by not sending download() to bg)
else
download "$URI" "$COUNTER" & # pass URI and URI number to download()
DYNAMIC_COUNTER="$[$DYNAMIC_COUNTER+1]"
fi
COUNTER="$[$COUNTER+1]" # increment counter
done | yad --multi-progress --auto-kill $YADBARS --title "$TITLE" \
--text "$TEXT" --window-icon "$ICON" --image "$IMAGE"
# ↑ launch yad multi progress-bar window
这就是它的样子：
请务必通读所有评论以了解脚本的工作原理，如果您有任何问题，请随时在下面的评论中提问。
编辑：
我添加了对设置最大同时下载数的支持。例如。对于 MAXDLS="5" ：
