GNU中的递归通配符使? [英] Recursive wildcards in GNU make?

问题描述

自从我使用make已经有一段时间了，所以请忍受...

我有一个目录flac，其中包含.FLAC文件.我有一个对应的目录，包含MP3文件的mp3.如果FLAC文件比相应的MP3文件新(或相应的MP3文件不存在)，那么我想运行一堆命令将FLAC文件转换为MP3文件，并在其中复制标签.

启动器:我需要递归搜索flac目录，并在mp3目录中创建相应的子目录.目录和文件的名称中可以包含空格，并以UTF-8命名.

我想用make来驱动它.

解决方案

我会尝试以下方法

FLAC_FILES = $(shell find flac/ -type f -name '*.flac')
MP3_FILES = $(patsubst flac/%.flac, mp3/%.mp3, $(FLAC_FILES))

.PHONY: all
all: $(MP3_FILES)

mp3/%.mp3: flac/%.flac
    @mkdir -p "$(@D)"
    @echo convert "$<" to "$@"

针对make初学者的一些快速笔记:

• 命令前面的@阻止make在实际运行命令之前打印命令.
• $(@D)是目标文件名($@)的目录部分
• 确保其中带有shell命令的行以制表符开头，而不以空格开头.

即使这可以处理所有UTF-8字符和内容，它也会在文件或目录名称中的空格处失败，因为make使用空格分隔makefile中的内容，并且我不知道解决方法那.恐怕只剩下一个shell脚本了:-/

It's been a while since I've used make, so bear with me...

I've got a directory, flac, containing .FLAC files. I've got a corresponding directory, mp3 containing MP3 files. If a FLAC file is newer than the corresponding MP3 file (or the corresponding MP3 file doesn't exist), then I want to run a bunch of commands to convert the FLAC file to an MP3 file, and copy the tags across.

The kicker: I need to search the flac directory recursively, and create corresponding subdirectories in the mp3 directory. The directories and files can have spaces in the names, and are named in UTF-8.

And I want to use make to drive this.

解决方案

I would try something along these lines

FLAC_FILES = $(shell find flac/ -type f -name '*.flac')
MP3_FILES = $(patsubst flac/%.flac, mp3/%.mp3, $(FLAC_FILES))

.PHONY: all
all: $(MP3_FILES)

mp3/%.mp3: flac/%.flac
    @mkdir -p "$(@D)"
    @echo convert "$<" to "$@"

A couple of quick notes for make beginners:

• The @ in front of the commands prevents make from printing the command before actually running it.
• $(@D) is the directory part of the target file name ($@)
• Make sure that the lines with shell commands in them start with a tab, not with spaces.

Even if this should handle all UTF-8 characters and stuff, it will fail at spaces in file or directory names, as make uses spaces to separate stuff in the makefiles and I am not aware of a way to work around that. So that leaves you with just a shell script, I am afraid :-/

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