EOL 之前的流程

发布于 2024-12-17 20:38:51 字数 684 浏览 0 评论 0原文

我有一个小脚本，可以对编译器（maven）输出进行着色，这样错误就不会再被忽视。

#!/bin/sh
export TEXT_YELLOW=`tput setaf 3`
export TEXT_RED=`tput setaf 1`
export RESET_FORMATTING=`tput sgr0`

mvn $* | sed \
-e "s/\(\[WARNING\].*\)/${TEXT_YELLOW}\1${RESET_FORMATTING}/g" \
-e "s/\(\[ERROR\].*\)/${TEXT_RED}\1${RESET_FORMATTING}/g"

问题是我的编译器具有 shell 中的 shell 功能（mvn cli:execute-phase）。屏幕上应该会出现像 maven2> 这样的命令提示符，然后用户就可以输入命令。不幸的是，由于我的脚本，我只看到一个闪烁的光标。仅当我按 Enter 键时，才会弹出 maven2>提示前缀文本。

我的猜测是 sed 正在等待 EOL，然后再在屏幕上打印内容。要修复它，我必须查看流是否以字符串 maven2> 开头。如果是，则直接打印到终端，否则将其转发到sed。在bash中可以吗？

原文

I have a small script that colorizes compiler(maven) output so errors won't be overlooked anymore.

#!/bin/sh
export TEXT_YELLOW=`tput setaf 3`
export TEXT_RED=`tput setaf 1`
export RESET_FORMATTING=`tput sgr0`

mvn $* | sed \
-e "s/\(\[WARNING\].*\)/${TEXT_YELLOW}\1${RESET_FORMATTING}/g" \
-e "s/\(\[ERROR\].*\)/${TEXT_RED}\1${RESET_FORMATTING}/g"

Problem is the shell within a shell feature my compiler has (mvn cli:execute-phase). There a command prompt like maven2> should be visible on screen and the user is then able to type in commands. Unfortunately due to my script I see nothing but a blinking cursor. Only when I press the enter key the maven2> prompt-prefix-text pops up.

My guess is that sed is waiting for an EOL before it prints something on screen. To fix it I would have to look if the stream starts with the string maven2>. If it does then print out directly to terminal, otherwise forward it to sed. Is it possible in bash?

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忘东忘西忘不掉你 2024-12-24 20:38:51

好吧，我找到了解决方案。我尝试了很多方法，但最终无法纯粹用 bash 解决问题。所以我写了一个 python 脚本，它可以工作。只需将 Maven 输出通过管道传输到脚本，如 mvn cli:execute-phase | colorize.py。也可以在 bashrc 中编写别名，以便所有 Maven 调用都有彩色输出。

#!/usr/bin/python
# Same as regular mvn command but with colored output.

import sys, subprocess, os, time

def colorize( line ):
    red = '\033[1;31m'
    yellow = '\033[1;33m'
    endcolor = '\033[1;m'

    if ("[ERROR]" in line) or ("ERROR" in line ) or ( "Failures" in line ) or ( "Errors" in line ):        
        print red + line + endcolor,    
    elif ("[WARNING]" in line) or ( "WARN" in line ):
        print yellow + line + endcolor,
    else:
        print line,


line=""
printPrompt = True
while True:

    c = sys.stdin.read(1)

    if not c:
        # eof
        break

    line = line + c

    if printPrompt:
        if line.startswith("maven2>"):        
            print "maven2>",
            sys.stdout.flush()
            printPrompt = False
    else:
        # rewrite the current line to console
        sys.stdout.write('\r')
        print line,
        sys.stdout.flush()

    if c.endswith("\n"):
        colorize(line)
        line = ""
        printPrompt = True

Okay, I found a solution. I tried a lot of things but was unable to solve the problem purely with bash in the end. So I wrote a python script instead and it works. Just pipe the maven output to the script like mvn cli:execute-phase | colorize.py. It is also possible to write an alias in your bashrc so all maven calls have colorized output.

#!/usr/bin/python
# Same as regular mvn command but with colored output.

import sys, subprocess, os, time

def colorize( line ):
    red = '\033[1;31m'
    yellow = '\033[1;33m'
    endcolor = '\033[1;m'

    if ("[ERROR]" in line) or ("ERROR" in line ) or ( "Failures" in line ) or ( "Errors" in line ):        
        print red + line + endcolor,    
    elif ("[WARNING]" in line) or ( "WARN" in line ):
        print yellow + line + endcolor,
    else:
        print line,


line=""
printPrompt = True
while True:

    c = sys.stdin.read(1)

    if not c:
        # eof
        break

    line = line + c

    if printPrompt:
        if line.startswith("maven2>"):        
            print "maven2>",
            sys.stdout.flush()
            printPrompt = False
    else:
        # rewrite the current line to console
        sys.stdout.write('\r')
        print line,
        sys.stdout.flush()

    if c.endswith("\n"):
        colorize(line)
        line = ""
        printPrompt = True

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旧梦荧光笔 2024-12-24 20:38:51

@mainbrain当显示提示“定义属性‘groupId’的值::”时，你的python脚本工作正常，除了“mvn archetype:generate”。

示例：

mvn archetype:generate \
   -DarchetypeRepository=repo1.maven.org \
   -DarchetypeGroupId=org.codehaus.mojo \
   -DarchetypeArtifactId=gwt-maven-plugin \
   -DarchetypeVersion=2.4.0

@mainbrain Your pythons's script works fine except for "mvn archetype:generate" when the prompt "Define value for property 'groupId': : " is showing.

example :

mvn archetype:generate \
   -DarchetypeRepository=repo1.maven.org \
   -DarchetypeGroupId=org.codehaus.mojo \
   -DarchetypeArtifactId=gwt-maven-plugin \
   -DarchetypeVersion=2.4.0

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