如何确定终端的背景颜色?

问题描述 投票:16回答:5

我想知道是否有办法确定终端的背景颜色?

在我的情况下,使用gnome-terminal。 它可能很重要,因为它完全由终端应用程序绘制窗口的背景,甚至可能是纯色的东西。

unix terminal x11 gnome-terminal
5个回答
6
投票

我想出了以下内容:

#!/bin/sh
#
# Query a property from the terminal, e.g. background color.
#
# XTerm Operating System Commands
#     "ESC ] Ps;Pt ST"

oldstty=$(stty -g)

# What to query?
# 11: text background
Ps=${1:-11}

stty raw -echo min 0 time 0
# stty raw -echo min 0 time 1
printf "\033]$Ps;?\033\\"
# xterm needs the sleep (or "time 1", but that is 1/10th second).
sleep 0.00000001
read -r answer
# echo $answer | cat -A
result=${answer#*;}
stty $oldstty
# Remove escape at the end.
echo $result | sed 's/[^rgb:0-9a-f/]\+$//'

来源/回购/要点:https://gist.github.com/blueyed/c8470c2aad3381c33ea3


12
投票

这有一个xterm control sequence

\e]11;?\a

\e\a分别是ESC和BEL字符。)

Xterm兼容的终端应该以相同的顺序回复,问号由X11 colorspec替换,例如rgb:0000/0000/0000为黑色。


1
投票

除了apparently rxvt-only $COLORFGBG,我不知道还有其他任何东西存在。大多数人似乎是referring to如何vim does it,甚至这是一个受过良好教育的猜测。


1
投票

一些链接:

例如。来自Neovim issue 2764的一些相关片段:

/*
 * Return "dark" or "light" depending on the kind of terminal.
 * This is just guessing!  Recognized are:
 * "linux"         Linux console
 * "screen.linux"   Linux console with screen
 * "cygwin"        Cygwin shell
 * "putty"         Putty program
 * We also check the COLORFGBG environment variable, which is set by
 * rxvt and derivatives. This variable contains either two or three
 * values separated by semicolons; we want the last value in either
 * case. If this value is 0-6 or 8, our background is dark.
 */
static char_u *term_bg_default(void)
{
  char_u      *p;

  if (STRCMP(T_NAME, "linux") == 0
      || STRCMP(T_NAME, "screen.linux") == 0
      || STRCMP(T_NAME, "cygwin") == 0
      || STRCMP(T_NAME, "putty") == 0
      || ((p = (char_u *)os_getenv("COLORFGBG")) != NULL
          && (p = vim_strrchr(p, ';')) != NULL
          && ((p[1] >= '0' && p[1] <= '6') || p[1] == '8')
          && p[2] == NUL))
    return (char_u *)"dark";
  return (char_u *)"light";
}

关于来自COLORFGBGGnome BugZilla 733423 env:

在我刚刚尝试使用linux的很多终端中,只有urxvt和konsole设置了它(那些没有:xterm,st,术语,pterm)。 Konsole和Urxvt使用不同的语法和语义,即对我来说,konsole将其设置为“0; 15”(即使我使用“浅黄色黑色”配色方案 - 那么为什么不“默认”而不是“15”?),而我的urxvt将它设置为“0;默认值; 15”(它实际上是白色的黑色 - 但为什么是三个字段?)。因此,这两个值都不符合您的规格。

这是我正在使用的一些代码(via):

def is_dark_terminal_background():
    """
    :return: Whether we have a dark Terminal background color, or None if unknown.
        We currently just check the env var COLORFGBG,
        which some terminals define like "<foreground-color>:<background-color>",
        and if <background-color> in {0,1,2,3,4,5,6,8}, then we have some dark background.
        There are many other complex heuristics we could do here, which work in some cases but not in others.
        See e.g. `here <https://stackoverflow.com/questions/2507337/terminals-background-color>`__.
        But instead of adding more heuristics, we think that explicitly setting COLORFGBG would be the best thing,
        in case it's not like you want it.
    :rtype: bool|None
    """
    if os.environ.get("COLORFGBG", None):
        parts = os.environ["COLORFGBG"].split(";")
        try:
            last_number = int(parts[-1])
            if 0 <= last_number <= 6 or last_number == 8:
                return True
            else:
                return False
        except ValueError:  # not an integer?
            pass
    return None  # unknown (and bool(None) == False, i.e. expect light by default)

0
投票

您是指确定终端背景颜色或设置终端颜色的方法吗?

如果是后者,您可以查询终端的PS1环境变量以获取颜色。

这里有一篇关于设置(以及推导出)终端颜色的文章:http://www.ibm.com/developerworks/linux/library/l-tip-prompt/

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