5.0 KiB
5.0 KiB
Intro
The fundamental problem:
git submodule update --init soundscape
cargo build --release
install -pm755 target/release/tap /usr/local/bin/
But you can't type this for each run.
First Solution
#!/bin/sh
git submodule update --init soundscape
cargo build --release
install -pm755 target/release/tap /usr/local/bin/
At this point, every test takes 10 minutes.
Second Solution
#!/bin/sh
[ -f soundscape/.git ] || git submodule update --init soundscape
[ -f target/release/tap ] || cargo build --release
[ -f target/release/tap ] || \
install -pm755 target/release/tap /usr/local/bin/
Makefile Solutions
- input, process, output.
- automatic idempotence
INSTALL_DIR = /usr/local/bin
soundscape/.git:
git submodule update --init soundscape
/usr/local/bin/tap: target/release/tap
install -pm755 target/release/tap $(INSTALL_DIR)
target/release/tap: src soundscape/.git
cargo build --release
The Three Sigils
Readable, but slow:
forts/big_fort.txt: forts/short.txt forts/long.txt
cat forts/short.txt forts/long.txt > forts/big_fort.txt
forts/:
mkdir forts
forts/short.txt: forts/
fortune -s > forts/short.txt
forts/long.txt: forts/
fortune -l > forts/long.txt
| Make this | From That | From These |
|---|---|---|
$@ |
$< |
$^ |
forts/big_fort.txt: forts/short.txt forts/long.txt
cat $^ > $@
forts/: README.md
mkdir $@
forts/short.txt: forts/
fortune -s > $@
forts/long.txt: forts/
fortune -l > $@
Gotcha: Directories
forts/big_fort.txt: forts/short.txt forts/long.txt
cat $^ > $@
forts/: README.md
mkdir $@
forts/short.txt: forts/
fortune -s > $@
forts/long.txt: forts/
fortune -l > $@
README.md:
echo "Find the fortunes in the fort dir" > $@
Variables
include /etc/os-release
DAY != date +%d
MESSAGE != fortune -s
motd_$(DAY):
$(info Placing message:)
echo "Welcome to $(NAME)" > $@
echo $(MESSAGE) >> $@
Gotcha: Hanging Quotes
echo "Welcome to "Arch Linux""
Add New Variables
make -f vars -e MESSAGE="Red alert, all hands on deck!"
Gotcha: Quote, or Risk Escape
make -f vars -e MESSAGE="<h1> HTML Headers </h1>"
Gotcha: Variables from Shell
This works:
file:
$(info Hello $(USER))
...but not this:
file:
user=bob
echo $user
Nor this:
numbers:
for x in 1 2 3 4 5; do
echo $x
done > $@
Nor this:
numbers:
for x in 1 2 3 4 5; do echo $x ; done > $@
Ugly Fixes are Ugly
This works, but don't.
file:
for x in 1 2 ;\
do echo $$x ;\
done > $@
Phonies, and the Problems with Lies
Clean
.PHONY: clean
clean:
git clean -fdX
Gotcha: Recompiling without Changes
CHECKER = command -v
.PHONY: check
check:
$(CHECKER) fortune >/dev/null
$(CHECKER) cowsay >/dev/null
file: check # Needs a '|'
fortune | cowsay > $@
Non-Compiling Checks
make-n- Gotcha: shell output variables.
The Fourth Sigil: %
Create standardized rules with %.
CP = ln -f
output: pngs/ldap.png
jpgs/ldap.jpg: ../../ldap/ldap.jpg
mkdir -p $(dir $@)
$(CP) $< $@
pngs/%.png: jpgs/%.jpg
mkdir -p $(dir $@)
$(info making $(@F) in $(@D))
magick $< $@
Bling: makefile2graph
┌────────────────┐ ┌────────────────────┐
│ forts/long.txt │ ◀── │ forts/ │
└────────────────┘ └────────────────────┘
│ │
│ │
│ ▼
│ ┌────────────────────┐
│ │ forts/short.txt │
│ └────────────────────┘
│ │
│ │
│ ▼
│ ┌────────────────────┐
└──────────────────▶ │ forts/big_fort.txt │
└────────────────────┘
Gotcha: The Binary is Called make2graph
- Works with GUI tools maybe, IDK, I don't use Windows.
- Some systems can use
graph-easy, but it's outdated.
Patsubst and Wildcards
IMAGES = $(wildcard jpgs/*)
COL = $(patsubst jpgs/%,collection/%,$(IMAGES))
.PHONY: show
show:
$(info IMAGES is $(IMAGES))
$(info Col is $(COL))
.PHONY: output
output: $(COL)
collection/%.jpg: jpgs/%.jpg
mkdir -p $(@D)
cp $< $@
Use Cases
- Backups
- Making Websites
git clone https://gitlab.com/bindrpg/blag
NOT installations- ...but maybe installations?
- Setting