幻灯片放映模式切换windows terminal背景图片

时间 2021-04-11

标签 python shell json windows 安全 app dom ssh this 栏目 Windows 繁體版

原文原文链接

幻灯片放映模式切换windows terminal背景图片

幻灯片放映模式切换windows terminal背景图片

脚本功能

以幻灯片模式自动切换windows terminal的背景图片，可自定义包含图片的目录、切换频率等。python

使用命令python change_tty_image.py --help查看使用帮助。shell

代码一共就162行，核心功能代码事实上可能只有不到50行，其余都是一些检查、日志等语句。感兴趣的能够download脚本，自行定制一些功能。json

开发需求

近期在折腾windows terminal，于我而言这款终端软件也基本彻底替代xshell，特别是win 10内置了ssh, scp等命令，用起来很是舒服和流畅。再和wsl结合起来一块儿玩，简直爽到飞起。windows

windows terminal能够自定义主题样式，自定义背景图片。做为一个伪二次元爱好者，固然要把背景换成adroable的小姐姐！安全

然而，每次终端只能设置一张图片，根本没法滿足敲命令的时候看不同的二次元小姐姐的需求。联想到windows能够设定图片目录，并选择幻灯片模式动态切换桌面背景，因而去google一番，发现windows terminal的settings.json好像没有这个选项。查阅[官方文档](Windows Terminal Appearance Profile Settings | Microsoft Docs)以下：app

要么给一个路径，要么就和桌面壁纸设置为同样。dom

因此，若是想要自动切换windows terminal的背景图片，有一个折中方案：把backgroundImage设置为desktopWallpaper，而后桌面背景搞成幻灯片模式，也就是下面这样子：ssh

这样就能自动切换。ui

可是像我这样壁纸比较多的收藏家，正愁壁纸多得无处安放，怎么能把desktop和windows terminal设置成同样的背景呢？这多不合适！this

因而，我花了1个小时，用python写了一个简单的脚本，支持设置壁纸目录、更新频率、随机更新功能，每一个固定时间就为windows terminal切换一张背景图片。

使用技术

要实现这个功能其实很简单，不须要高大上的技术。整个开发需求主要包含两点：

定时任务
修改windows terminal的settings.json中的backgroundImage项，切换为指定目录下的图片路径，并进行轮循设置。

针对两点需求，实现手段分别为：

使用time.sleep()设置定时任务。这应该是简单的方式了，适合简单的定时任务触发。
使用IO操做，先读取指定目录的全部image路径，而后取一个路径出来，替换掉backgroundImage的值便可。

实现起来很简单，也顺便帮我复习了一下python操做文件和目录的一些接口。

time模块获取时间，方便记录日志
random模块获取随机数，获得随机图片，显然，此处无需使用安全随机数生成器
os.walk()遍历全部目录下全部的图片路径
设置临时文件，读配置的时候，边读边写，而后可使用re模块，正则匹配含有backgroundImage的行，替换掉路径
线程休眠实现定时任务

操做说明

python change_tty_image.py -h查看帮助
确保settings.json中已经预约义了一个路径
每次开始任务以前会备份一份配置文件，不用担忧原有配置丢失
更新频率至少为10 min，太快了不就蜻蜓点水
建议使用pythonw后台运行脚本

使用示例

查看帮助

输入参数使用

关键操做都会记录日志，或在屏幕输出！

脚本详情

# -*- encoding: utf-8 -*-
'''
@File    : change_tty_image.py
@Time    : 2021/04/08 21:00:20
@Author  : Roderick Chan
@Email   : ch22166@163.com
@Desc    : Change windows-terminal background image automatically
'''

import os
import sys
import functools
import random
import re
import time

# key word to set image
key_word = "\"backgroundImage\""

# help message
help_msg = """
Usage: 
    python change_tty_image.py [settings_path] [picture_directory] [update_frequency] [random]
Function:
    Change windows-terminal background image automatically.
Note:
    settings_path:          [required]
        The absolute path of windows-terminal setting file.
    picture_directory:      [required]
        A absolute directory path fulled with pictures, only support 'png', 'jpg', 'gif'.
    update_frequency:       [required]
        The frequency to update image, should be more than 10, default value is 30, which represents 30min.
    random:                 [optional]
        Select image randomly or not. Default value: False.
Tips:
    1. Use `python` to run this script and output log-info on the screen.
    2. Use `pythonw` to run this script in the background and output nothing, but your can use 'tasklist' and 'taskkill' to stop. 
    3. recommendation command:
        pythonw change_tty_image.py [settings_path] [picture_directory] [update_frequency] [random] > change_image.log
    4. Use `python change_tty_image.py -h` to get help.
"""

def get_time():
    return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime()) 

def log(msg):
    print("\033[1;32mINFO\033[0m: {}    \033[1;34mTime\033[0m: {}\n".format(msg, get_time()))

# parse args
# check args
args = sys.argv
arg_len = len(args)

# show help
if len(args) > 1 and (args[1] == "-h" or args[1] == "--help"):
    print(help_msg)
    sys.exit(0)

if arg_len < 4 or arg_len > 5:
    print("\033[1;31m[-] Args Error!\033[0m\n")
    print(help_msg)
    sys.exit(-1)

# validate args
settings_path = args[1]
picture_directory = args[2]
update_frequency = args[3]
random_enabled = False
if arg_len == 5:
    random_enabled = bool(args[4])

assert os.path.exists(settings_path), "settings_path doesn't exist."
assert os.path.isfile(settings_path), "settings_path is not a file path."
assert os.path.exists(picture_directory), "picture_directory doesn't exist."
assert os.path.isdir(picture_directory), "picture_directory is not a dir path."

# process settings_path
settings_dir, settings_full_name = os.path.split(settings_path)
settings_name, setting_suffix = os.path.splitext(settings_full_name)
backup_setting_path = os.path.join(settings_dir, settings_name + "_backup" + setting_suffix)
tmp_setting_path = os.path.join(settings_dir, settings_name + "_tmpfile" + setting_suffix)


# process update_frequency
if update_frequency.isdecimal():
    update_frequency = int(update_frequency)
    if update_frequency < 10:
        update_frequency = 30
else:
    update_frequency = 30
log('settings_path: {}'.format(settings_path))
log('backup_setting_path: {}'.format(backup_setting_path))
log('picture_directory: {}'.format(picture_directory))
log('update_frequency: {}'.format(update_frequency))
log('random_enabled: {}'.format(random_enabled))

# get all picture path
all_picture_path = []
support_suffix = ('.jpg', '.png', '.gif')
for r, dl, fl in os.walk(picture_directory,):
    for f in fl:
        is_ok = functools.reduce(lambda a, b : a or b, map(lambda x: f.endswith(x), support_suffix))
        if not is_ok:
            continue
        # check size
        if len(all_picture_path) > 0x1000:
            continue;
        all_picture_path.append(os.path.join(r, f))

assert len(all_picture_path) > 0, 'no pictures appended, check your picture_directory.'

# validate settings_path
flag = False
with open(file=settings_path, mode='r+', encoding='utf-8') as fd:
    for line in fd:
        if line.strip().startswith(key_word):
            flag = True
            break
assert flag, "please initial your windows-terminal settings file first, add {} value at least.".format(key_word)

log('all_picture_path : {}'.format(all_picture_path))

# back up
if not os.path.exists(backup_setting_path):
    cmd = "copy {} {}".format(settings_path, backup_setting_path)
    os.popen(cmd)
    log("execute \"{}\"".format(cmd))

idx = -1

while True:
    if random_enabled:
        idx = random.randint(0, len(all_picture_path) - 1)
    else:
        idx += 1
        idx %= len(all_picture_path)
    
    # replace '\' with '/'
    cur_picture_path = all_picture_path[idx].replace("\\", "/")
    log('cur_picture_path: {}'.format(cur_picture_path))
    with open(file=settings_path, mode='r', encoding='utf-8') as fd_src:
        with open(file=tmp_setting_path, mode='w+', encoding='utf-8') as fd_bck:
            for line in fd_src:
                if not line.strip().startswith(key_word):
                    fd_bck.write(line)
                    continue
                res = re.sub(r"({}\s?:\s?)\".+\",".format(key_word), r'\1"{}",'.format(cur_picture_path), line)
                fd_bck.write(res)
    
    cmd = "copy {} {}".format(tmp_setting_path, settings_path)
    os.popen(cmd)
    log("execute \"{}\"".format(cmd))
    
    cmd = "del {}".format(tmp_setting_path)
    os.popen(cmd)
    log("execute \"{}\"".format(cmd))
    
    # sleep
    log("sleep start...")
    time.sleep(update_frequency * 60)
    log("sleep end...")

引用参考

windows terminal profile setting：<Windows Terminal Appearance Profile Settings | Microsoft Docs>