CODEWITHSUNDEEP
makefilegnu-make
tomocafe
tomocafe

Reputation: 1544

Makefile pattern for 1:1 recipe with a prerequisite that differs from target in both directory and file extension

For each .md file underneath a directory called src, I want to generate an HTML file underneath a new directory pub with the same internal directory structure, e.g.

src/foo/hello.md -> pub/foo/hello.html
src/bar/world.md -> pub/bar/world.html

I'm stuck on writing the prerequisites for each html file. Here's what I have so far:

SRCS = $(shell find src -name "*.md")
HTML = $(subst src/,pub/,$(SRCS:.md=.html))

%.html: %.md
    @echo "placeholder to generate $@ from $<"

publish: $(HTML)

As written, I get

$ make publish
make: *** No rule to make target `pub/foo/hello.html', needed by `publish'.  Stop.

If I remove the prerequisites like this:

%.html: %.md
    @echo "placeholder to generate $@ from $<"

then I get:

$ make publish
placeholder to generate pub/foo/hello.html from 
placeholder to generate pub/bar/world.html from

which is closer, but does not handle the prerequisite Markdown file.

How do I write a pattern for the prerequisite with both differing root directory and extension?

Upvotes: 0

Views: 42

Answers (1)

MadScientist
MadScientist

Reputation: 100856

Just write the prefix and the suffix in the pattern:

pub/%.html : src/%.md
        ...

Upvotes: 1

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