place example makefiles

slides/makefiles/makefiles.md

@@ -12,13 +12,86 @@ colortheme:
 
 # Intro
 
+The fundamental problem:
+
+```bash
+git submodule update --init soundscape
+cargo build --release
+install -pm755 target/release/tap /usr/local/bin/
+```
+
+You can't type this after every test.
+
+***
+
+## First Solution
+
+```bash
+#!/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
+
+```bash
+#!/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
+
+```bash
+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
+```
+
+***
+
+# Basic
+
 - *Gotcha*: directories
 - This, that, and these
 
 ***
 
+## Repetition, Repetition, Repetition
+
+```make
+.PHONY: output
+output: release/index.html
+
+release/: backups.zip
+	mkdir $@
+
+release/index.html: index.html release/
+	cp  $< $@
+
+index.html: backups.zip
+	unzip $<
+```
+
+***
+
 # Variables
 
 - From your shell.
@@ -59,7 +132,6 @@ colortheme:
 
 ***
 
-
 # Bling: make2graph
 
 - *Gotcha*: completely outdated.
@@ -75,8 +147,8 @@ colortheme:
 
 # Special Commands
 
-- dirname
-- `DIR = test -d $(dirname $@) || mkdir $(dirname $@)`
+- dir
+- `DIR = test -d $(dir $@) || mkdir $(dir $@)`
 - patsubst
 - Wildcards (or not?)