可以漂亮地打印Awk的代码吗? [英] Is it possible to pretty print Awk's code?

问题描述

我经常发现自己写的是 Awk单行代码，随着时间的流逝，它变得越来越复杂.

Quite often I find myself writing Awk one-liners that gain complexity over time.

我知道我总是可以创建一个Awk文件来继续添加用例，但是它肯定不如在命令行上更改文本有用.

I know I can always create an Awk file where to keep adding use cases, but it is certainly not as usable as changing the text on the command line.

为此:我有什么办法可以打印Awk的代码，从而使我更有意义?

For this: is there any way I can pretty print Awk's code, so I can make more sense out of it?

例如，鉴于此:

awk 'flag{ if (/PAT2/){printf "%s", buf; flag=0; buf=""} else buf = buf $0 ORS}; /PAT1/{flag=1}' file

如何使内容更具可读性?

How can I get something a bit more readable?

推荐答案

Ed Morton告诉我 GNU awk具有-o漂亮打印选项:

Ed Morton showed me that GNU awk has the -o option to pretty print:

GNU Awk用户指南，位于选项上>

GNU Awk User's Guide, on Options

-o [文件]
-漂亮的打印[=文件]

启用awk程序的漂亮打印.表示--no-optimize.默认情况下，在名为awkprof.out的文件中创建输出程序(请参见配置文件).可选的 file 参数使您可以为输出指定其他文件名.如果提供了 file ，则-o和文件之间不允许有空格.

Enable pretty-printing of awk programs. Implies --no-optimize. By default, the output program is created in a file named awkprof.out (see Profiling). The optional file argument allows you to specify a different file name for the output. No space is allowed between the -o and file, if file is supplied.

注意:过去，此选项也会执行您的程序.情况不再如此.

NOTE: In the past, this option would also execute your program. This is no longer the case.

所以这里的关键是使用-o，并使用:

So the key here is to use -o, with:

• 不希望将输出自动存储​​在"awkprof.out"中.
• -将输出存储在stdout中.
• file将输出存储在名为 file 的文件中.

• nothing if we want the output to be stored automatically in "awkprof.out".
• - to have the output in stdout.
• file to have the output stored in a file called file.

实时观看:

$ gawk -o- 'BEGIN {print 1} END {print 2}'
BEGIN {
    print 1
}

END {
    print 2
}

或者:

$ gawk -o- 'flag{ if (/PAT2/){printf "%s", buf; flag=0; buf=""} else buf = buf $0 ORS}; /PAT1/{flag=1}' file
flag {
    if (/PAT2/) {
        printf "%s", buf
        flag = 0
        buf = ""
    } else {
        buf = buf $0 ORS
    }
}

/PAT1/ {
    flag = 1
}

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