我有一个存储项目资产的目录，比如：

+-- assets
|   +-- styles
|   |   +-- child
|   |   |   +-- child.css
|   |   +-- main.css
|   +-- font.ttf
|   +-- image.png

如您所见，它们是几种文件类型(这只是一个示例，可能还有更多类型)，树深度可能会有所不同。

+-- assets
|   +-- child.css
|   +-- font.ttf
|   +-- image.png
|   +-- main.css

我尝试使用模式规则，但我是GNU make的新手，所以似乎什么都不起作用。

我使用Bash lobstar功能获得源文件的递归列表，并通过make的字符串操作函数对其进行修改：

BR_ASSETS := /home/user/project/assets/
BR_APP_ASSETS := /home/user/project/build/assets/

SOURCES := $(shell ls $(BR_ASSETS)**/*.*)
TARGETS := $(addprefix $(BR_APP_ASSETS),$(notdir $(SOURCES)))

下一步怎么办？

提前表示感谢。

推荐答案

all:
.PHONY: all

BR_ASSETS := /home/user/project/assets/
BR_APP_ASSETS := /home/user/project/build/assets/

SOURCES := $(shell find $(BR_ASSETS) -type f)
$(info SOURCES=$(SOURCES))
TARGETS := $(addprefix $(BR_APP_ASSETS),$(notdir $(SOURCES)))

# Generate rules to map sources into targets
$(foreach s,$(SOURCES),$(foreach t,$(filter %$(notdir $s),$(TARGETS)),$(info New rule: $t: $s)$(eval $t: $s)))

# All targets have the same recipe.
$(TARGETS):; $(if $(wildcard $(@D)),,mkdir -p $(@D) &&) cp $^ $@

all: $(TARGETS)
clean:; rm -rf $(BR_APP_ASSETS)
.PHONY: clean

运行此生成文件之前的环境：

$ find /home/user/project
/home/user/project
/home/user/project/assets
/home/user/project/assets/font.ttf
/home/user/project/assets/img.png
/home/user/project/assets/styles
/home/user/project/assets/styles/child
/home/user/project/assets/styles/child/child.css
/home/user/project/assets/styles/main.css
/home/user/project/build

运行此生成文件：

$ make -f Makefile.sample
SOURCES=/home/user/project/assets/font.ttf /home/user/project/assets/img.png /home/user/project/assets/styles/child/child.css /home/user/project/asset
s/styles/main.css
New rule: /home/user/project/build/assets/font.ttf: /home/user/project/assets/font.ttf
New rule: /home/user/project/build/assets/img.png: /home/user/project/assets/img.png
New rule: /home/user/project/build/assets/child.css: /home/user/project/assets/styles/child/child.css
New rule: /home/user/project/build/assets/main.css: /home/user/project/assets/styles/main.css
mkdir -p /home/user/project/build/assets && cp /home/user/project/assets/font.ttf /home/user/project/build/assets/font.ttf
cp /home/user/project/assets/img.png /home/user/project/build/assets/img.png
cp /home/user/project/assets/styles/child/child.css /home/user/project/build/assets/child.css
cp /home/user/project/assets/styles/main.css /home/user/project/build/assets/main.css

运行此生成文件后的环境：

$ find /home/user/project
/home/user/project
/home/user/project/assets
/home/user/project/assets/font.ttf
/home/user/project/assets/img.png
/home/user/project/assets/styles
/home/user/project/assets/styles/child
/home/user/project/assets/styles/child/child.css
/home/user/project/assets/styles/main.css
/home/user/project/build
/home/user/project/build/assets
/home/user/project/build/assets/child.css
/home/user/project/build/assets/font.ttf
/home/user/project/build/assets/img.png
/home/user/project/build/assets/main.css