使用JRuby的Rails控制台问题:没有提示字符，没有制表符完成，箭头键断开等 [英] Rails console issues using JRuby: no prompt character, no tab completion, broken arrow keys, etc

问题描述

我在JRuby下的Rails控制台遇到各种问题，包括

I'm having various issues with my Rails console under JRuby, including

• 没有提示字符
• 标签完成不起作用(插入了文字标签)
• 上/下箭头不浏览历史记录(分别插入了^[[A或^[[B)
• 左/右箭头不移动光标(分别插入了^[[D或^[[C)
• Home / End 键不能将光标移动到行首/行尾(分别插入了1~或4~)； Ctrl + a / Ctrl + e 仍然可以工作
• Ctrl + c 杀死控制台，而不是杀死我要输入的行
• Ctrl + d 无效，直到我按 Enter (然后执行我在 Ctrl > d 和 Enter .

• No prompt character
• Tab completion not working (literal tab gets inserted)
• Up/down arrows not browsing history (^[[A or ^[[B gets inserted, respectively)
• Left/right arrows not moving cursor (^[[D or ^[[C gets inserted, respectively)
• Home/End keys not moving cursor to beginning/end of line (instead 1~ or 4~ inserted, respectively); Ctrl+a / Ctrl+e work though
• Ctrl+c killing console instead of killing the line I'm entering
• Ctrl+d not having any effect until I hit Enter (which then executes anything I entered between Ctrl+d and Enter in my Unix shell).

我从rvm安装了我的JRuby解释器，如下所示:

I installed my JRuby interpreter from rvm like so:

rvm install jruby-1.6.8 --1.9

我的Rails项目是使用Bundler(而不是rvm gemsets)管理的，因此我使用bundle exec rails c运行Rails控制台.有趣的是，除了 Home / End 键和 Ctrl irb和bundle exec irb都没有上述大多数问题> + c 需要输入新的提示行之前，请输入 Enter .

My Rails project is managed using Bundler (not rvm gemsets), so I run my Rails console using bundle exec rails c. Interestingly, raw irb as well as bundle exec irb don't have most of the above issues, except the Home/End keys and Ctrl+c needs an Enter before I get a fresh prompt line.

我可以使用准系统Rails Gemfile复制该问题:

I can replicate the issue with a barebones Rails Gemfile:

source 'https://rubygems.org'
gem 'rails', '3.2.6'
gem 'sqlite3'

我的shell是zsh，在Ubuntu 12.04 64位上. $JAVA_HOME是/usr/lib/jvm/java-7-openjdk-amd64，但在安装此解释器时，它可能仍然是java-6.

My shell is zsh, on Ubuntu 12.04 64-bit. $JAVA_HOME is /usr/lib/jvm/java-7-openjdk-amd64, but it might have still been java-6 when I installed this interpreter, if that matters.

更新:一些修复程序

缺少提示字符显然是由Rails控制台将IRB.conf[:PROMPT_MODE]设置为:NULL引起的.对于常规的irb，我的设置为:RVM(显然rvm在~/.rvm/scripts/irb.rb中执行此操作；我通过注释掉脚本来排除rvm导致此问题).在~/.irbrc中提供:PROMPT_MODE值可解决此问题.我认为可能是类似的问题通过更改:IGNORE_SIGINT导致 Ctrl + c / Ctrl + d 问题和:IGNORE_EOF，但它们均设置为默认值.

The missing prompt character is apparently caused by the IRB.conf[:PROMPT_MODE] getting set to :NULL by the Rails console. For regular irb, mine gets set to :RVM (apparently rvm does this in ~/.rvm/scripts/irb.rb; I ruled out rvm causing this issue by commenting out the script). Providing a :PROMPT_MODE value in ~/.irbrc fixes this. I thought maybe a similar issue was causing the Ctrl+c / Ctrl+d problems by changing :IGNORE_SIGINT and :IGNORE_EOF, but they are both set to their default values.

通过将:USE_READLINE设置为true，可以固定制表符完成和箭头键.

Tab completion and arrow keys get fixed by setting :USE_READLINE to true.

这是我当前的~/.irbrc似乎可以解决上述问题:

Here's my current ~/.irbrc that seems to fix said issues:

require 'irb/completion'

IRB.conf[:PROMPT_MODE]  = :SIMPLE
IRB.conf[:USE_READLINE] = true
IRB.conf[:AUTO_INDENT]  = true

推荐答案

使用以下命令运行控制台对我来说解决了这些问题:

Running the console with the following fixed these sorts of problems for me:

jruby -Xlaunch.inproc=true -S rails c

如果您不想每次都运行该命令，则可以设置一个环境变量:

If you don't like running that command every time, you can set an environment variable:

set JRUBY_OPTS=-Xlaunch.inproc=true

或

export JRUBY_OPTS=-Xlaunch.inproc=true

然后

rails c

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