bash 如何更改默认的 virtualenv 提示？
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How do I change the default virtualenv prompt?
提问by kevin
How do you change the default Virtualenvwrapper prompt? By default, working on a particular virtual environment with a command like "workon <_name_of_env_>" prepends the name of the virtualenv to your prompt. This may work poorly if you're not using a default command prompt.
如何更改默认的 Virtualenvwrapper 提示？默认情况下，使用“workon <_name_of_env_>”之类的命令在特定虚拟环境中工作会在提示前添加 virtualenv 的名称。如果您没有使用默认命令提示符，这可能效果不佳。
采纳答案by kevin
By default, when you switch into a virtualenv with the command "workon < name_of_env >", virtualenvwrapper prepends a string along the lines of "(< name_of_env >) " to your command prompt. The problem is that I set my Bash prompt with the lines:
默认情况下，当您使用命令“workon < name_of_env >”切换到 virtualenv 时，virtualenvwrapper 会在命令提示符前添加一个“(< name_of_env >)”行的字符串。问题是我用以下行设置了我的 Bash 提示：
PROMPT_COLOR1='0;36m'
PROMPT_COLOR2='1;34m'
PS1='\n\[3[$PROMPT_COLOR1\](\t)\[3[$PROMPT_COLOR2\] \u @ \w \n\[3[$PROMPT_COLOR1\]$ \[3[0;39m\]'
Which yields a command prompt along the lines of:
这会产生一个命令提示符，如下所示：
< old_line >
(19:11:05) kevin @ ~/research
$
Switching into a new virtual environment with "workon < name_of_env >" turned the command prompt to something like:
使用“workon < name_of_env >”切换到一个新的虚拟环境，命令提示符变成了这样的：
< old_line >
(< name_of_env >)
(19:11:05) kevin @ ~/research
$
Which was more cluttered than I wanted and the wrong color to boot. I was hoping for something like:
这比我想要的更混乱，而且启动的颜色错误。我希望是这样的：
< old_line >
(< name_of_env >) (19:11:05) kevin @ ~/research
$
Ian Bicking has previously pointed out that virtualenvwrapper's hooks were the solutionbut I figured I'd post my actual code to maybe save someone else a minute down the line.
Ian Bicking 之前曾指出virtualenvwrapper 的钩子是解决方案，但我想我会发布我的实际代码，以便为其他人节省一分钟。
I simply edited the file $WORKON_HOME/postactivate to include these lines:
我只是编辑了 $WORKON_HOME/postactivate 文件以包含以下几行：
# color virtualenv name properly and put it after the \n if there is one at the start of the prompt
if [ ${_OLD_VIRTUAL_PS1:0:2} == '\n' ]; then
PS1="\n\[3[$PROMPT_COLOR1\](`basename \"$VIRTUAL_ENV\"`) ${_OLD_VIRTUAL_PS1:2:${#_OLD_VIRTUAL_PS1}}"
else
PS1="\[3[$PROMPT_COLOR1\](`basename \"$VIRTUAL_ENV\"`) $_OLD_VIRTUAL_PS1 "
fi
and voila! The color and location are correct and it even works when you switch directly from one virtual environment to another (which I hadn't expected).
瞧！颜色和位置是正确的，当您直接从一个虚拟环境切换到另一个虚拟环境时，它甚至可以工作（这是我没想到的）。
回答by ivanalejandro0
If you are working on a custom PS1 (as I when found out this issue), I recommend you to disable prompt change, use export VIRTUAL_ENV_DISABLE_PROMPT=1(see virtualenv docs), and make your own virtualenv prompt in order to add to your PS1.
如果您正在处理自定义 PS1（就像我发现此问题时一样），我建议您禁用提示更改，使用export VIRTUAL_ENV_DISABLE_PROMPT=1（请参阅virtualenv 文档），并制作您自己的 virtualenv 提示以便添加到您的 PS1。
See this snippet that I've used:
查看我使用过的这个片段：
function virtualenv_info(){
# Get Virtual Env
if [[ -n "$VIRTUAL_ENV" ]]; then
# Strip out the path and just leave the env name
venv="${VIRTUAL_ENV##*/}"
else
# In case you don't have one activated
venv=''
fi
[[ -n "$venv" ]] && echo "(venv:$venv) "
}
# disable the default virtualenv prompt change
export VIRTUAL_ENV_DISABLE_PROMPT=1
VENV="$(virtualenv_info)";
# the '...' are for irrelevant info here.
export PS1="... ${VENV} ..."
回答by Dror
I think the following is the simplest solution:
我认为以下是最简单的解决方案：
Add to ~/.virtualenvs/postactivatethe following:
添加~/.virtualenvs/postactivate以下内容：
PS1="\[\e[1;33;45m\] (`basename \"$VIRTUAL_ENV\"`) \[\e[0m\]$_OLD_VIRTUAL_PS1"
Taken from: http://wiki.hackzine.org/development/python/virtualenv.html
取自：http: //wiki.hackzine.org/development/python/virtualenv.html
回答by dtk
I adopted @ivanalejandro0's solutionby slimming down the function a bit:
我采用了@ivanalejandro0 的解决方案，稍微精简了功能：
function virtualenv_info {
# Get Virtual Env
if [[ -n "$VIRTUAL_ENV" ]]; then
# Strip out the path and just leave the env name
echo "(venv:${VIRTUAL_ENV##*/})"
fi
Or if you're feeling really hacky:
或者，如果你真的觉得自己很笨拙：
function virtualenv_info {
[[ -n "$VIRTUAL_ENV" ]] && echo "(venv:${VIRTUAL_ENV##*/})"
}
回答by TomB
One could reduce the function in @ivanalejandro0's solutionby using an "alternate value" parameter expansion. Also, as @crimson-egret commented, the call can be right in PS1 without the VENV intermediate:
可以通过使用“替代值”参数扩展来减少@ivanalejandro0 解决方案中的函数。此外，正如@crimson-egret 评论的那样，在没有 VENV 中间体的情况下，该调用可以在 PS1 中进行：
function __virtualenv_ps1 {
echo "${VIRTUAL_ENV:+(venv:${VIRTUAL_ENV##*/})}"
}
# disable the default virtualenv prompt change
export VIRTUAL_ENV_DISABLE_PROMPT=1
# the '...' are for irrelevant info here.
export PS1="... $(__virtualenv_ps1) ..."
