example Makefile to install required software

Makefile

#gnu makefile

REQUIRED-SOFTWARE=emacs git sudo

EMACS-INIT-FILE?=~/.emacs
EMACS-LISP-BASE?=~/.emacs.d/lisp
DOTFILES-DIR?=~/dotfiles

## DOTFILES-REPO?= YOUR DOTFILES REPO HERE

all: $(EMACS-LISP-BASE) color-theme magit

ssh-public-key: ~/.ssh/id_rsa.pub
	@echo "We need an ssh public key"

~/.ssh/id_rsa.pub:
	@ssh-keygen

bitbucket-configured: ssh-public-key
	@ssh -T hg@bitbucket.org \
	|| (echo "You need to add your new public key to bitbucket" \
	&& cat ~/.ssh/id_rsa.pub \
	&& exit 1)

github-configured: ssh-public-key
	@ssh -T git@github.com \
	|| (echo "You need to add your new public key to github" \
	&& cat ~/.ssh/id_rsa.pub \
	&& exit 1)

.PHONY: dotfiles
dotfiles : github-configured
	@if [ ! -d $(DOTFILES-DIR) ] ;\
	then \
	  echo "dotfiles does not exist, fetching"; \
	  git clone $(DOTFILES-REPO); \
	fi

# TODO handle case that existing file isn't a link
.PHONY: $(EMACS-INIT-FILE)
$(EMACS-INIT-FILE): dotfiles
	@if [ ! -e $(EMACS-INIT-FILE) ] ; then \
	  ln -s $(DOTFILES-DIR)/dot.emacs ~/.emacs ; \
	fi

.PHONY: $(EMACS-LISP-BASE)
$(EMACS-LISP-BASE):
	@mkdir -p $(EMACS-LISP-BASE)

###### Emacs utils ###########################################################


##  Color Theme
# http://www.nongnu.org/color-theme/
# The color theme page recommends using your package manager to install ...
#  we can't use the current install-program-template because it isn't an
#  executable so for the moment I'll just cheat and hard-code it
#  (this won't be portable)

COLOR-THEME-LOCATION?=/usr/local/share/site-lisp

.PHONY: color-theme
color-theme: sudo
	@if( ! pkg_info -x color-theme.el ) then \
	  sudo portmaster misc/color-theme.el; \
	fi

## Magit
# best git client ever
# http://philjackson.github.com/magit/
MAGIT_REPO=https://github.com/magit/magit.git

.PHONY: magit
magit: $(EMACS-LISP-BASE)/magit $(EMACS-INIT-FILE)

$(EMACS-LISP-BASE)/magit:
	@if [ ! -d  $@ ]; then (git clone $(MAGIT_REPO) $@); fi

### generate needed software dependancie targets

is-not-installed=! (command -v $(1))

define install-program-template
$(1): package-installer 
	@if ( $(call is-not-installed,$(1)) ) ; \
	then \
	  echo $(1) " not found in path."; \
	  echo "Installing " $(1); \
	  sudo portmaster $$(bsd-port-$(1)); \
	else \
	  echo $(1) "found"; \
	fi
endef

bsd-port-emacs:=editor/emacs
bsd-port-svn:=devel/svn
bsd-port-git:=devel/git
bsd-port-wget:=ftp/wget
bsd-port-sudo:=security/sudo
$(foreach pkg,$(REQUIRED-SOFTWARE),$(eval $(call install-program-template,$(pkg))))

package-installer :
	@$(call is-not-installed,portmaster) \
	&& cd /usr/ports/ports-mgmt/portmaster \
	&& make install clean \
	|| echo "found portmaster"