I'm trying to adjust my Makefile for my GoLang project. I have several rules which should:

Setup a git pre-commit hook (Don't want to commit the binary files and break copyright law by accident)
Download an mp3 file via youtube-dl
Extract a subsection of that video via ffmpeg

Previously I was doing this via shellscript and checking for each file manually, but in the act of converting my script to a Makefile I seem to be missing something.

The only rule that doesn't re-run is the pre-hook, but I think that's because I'm not using a variable for my target/rule name?

.default: install
.phony: install generate clean

export bin_directory = bin
export asset_directory = data/assets
export song_url = https://www.youtube.com/watch?v=z8cgNLGnnK4
export song_file = ${bin_directory}/nsp-you-spin-me-cover.mp3
export loop_file = ${asset_directory}/spin-loop.mp3

install:
    go install .

generate: $(loop_file)
    go generate ./data

$(loop_file): $(song_file)
    mkdir -p "${asset_directory}"
    ffmpeg -i "${song_file}" -ss 00:01:13.30 -to 00:01:30.38 -c copy "${loop_file}"

$(song_file): .git/hooks/pre-commit
    mkdir -p "${bin_directory}"
    youtube-dl "${song_url}" --extract-audio --audio-format mp3 --exec "mv {} ${song_file}"

.git/hooks/pre-commit:
    cp ./pre-commit .git/hooks/pre-commit
    chmod +x .git/hooks/pre-commit

clean:
    git clean -xdf

UPDATE: I've found this works correctly if I lump all the dependencies onto the generate rule like so (which seems like the wrong thing to do)

.default: install
.phony: install generate clean

bin_directory:=bin
asset_directory:=data/assets
song_url:=https://www.youtube.com/watch?v=z8cgNLGnnK4
song_file:=$(bin_directory)/nsp-you-spin-me-cover.mp3
loop_file:=$(asset_directory)/spin-loop.mp3

install:
    go install .

.git/hooks/pre-commit:
    cp ./pre-commit .git/hooks/pre-commit
    chmod +x .git/hooks/pre-commit

$(song_file):
    mkdir -p "${bin_directory}"
    youtube-dl "${song_url}" --extract-audio --audio-format mp3 --exec "mv {} ${song_file}"

$(loop_file):
    mkdir -p "${asset_directory}"
    ffmpeg -i "${song_file}" -ss 00:01:13.30 -to 00:01:30.38 -c copy "${loop_file}"

generate: .git/hooks/pre-commit $(song_file) $(loop_file)
    go generate ./data

clean:
    git clean -xdf

Makefile中定义的宏在java中怎么调用？

疲惫小耳朵

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