# Rust-Empty: A Makefile to get started with Rust
# https://github.com/bvssvni/rust-empty
# 
# The MIT License (MIT)
#
# Copyright (c) 2014 Sven Nilsen
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

SHELL := /bin/bash

# The default make command.
# Change this to 'lib' if you are building a library.
DEFAULT = help
# The entry file of library source.
# Change this to support multi-crate source structure.
# For advanced usage, you can rename the file 'rust-empty.mk'
# and call it with 'make -f rust-empty.mk <command>' from your Makefile.
LIB_ENTRY_FILE = src/lib.rs
# The entry file of executable source.
EXE_ENTRY_FILE = src/main.rs

EXAMPLE_FILES = examples/*.rs
SOURCE_FILES = $(shell test -e src/ && find src -type f)

COMPILER = rustc

# For release:
  COMPILER_FLAGS = -O
# For debugging:
# COMPILER_FLAGS = -g

RUSTDOC = rustdoc

# Extracts target from rustc.
TARGET = $(shell rustc --version verbose 2> /dev/null | awk "/host:/ { print \$$2 }")
# TARGET = x86_64-unknown-linux-gnu
# TARGET = x86_64-apple-darwin

TARGET_LIB_DIR = target/deps/

EXE_FILE = $(shell (rustc --crate-type=bin --print-file-name "$(EXE_ENTRY_FILE)" 2> /dev/null) || (echo "main"))
EXE_DIR = bin
EXE = $(EXE_DIR)/$(EXE_FILE)

# Use 'VERBOSE=1' to echo all commands, for example 'make help VERBOSE=1'.
ifdef VERBOSE
  Q :=
else
  Q := @
endif

all: $(DEFAULT)

help:
	$(Q)echo "--- rust-empty (0.7 005)"
	$(Q)echo "make run               - Runs executable"
	$(Q)echo "make exe               - Builds main executable"
	$(Q)echo "make lib               - Builds library"
	$(Q)echo "make test              - Tests library internally and externally"
	$(Q)echo "make test-internal     - Tests library internally"
	$(Q)echo "make test-external     - Tests library externally"
	$(Q)echo "make bench             - Benchmarks library internally and externally"
	$(Q)echo "make bench-internal    - Benchmarks library internally"
	$(Q)echo "make bench-external    - Benchmarks library externally"
	$(Q)echo "make doc               - Builds documentation for library"
	$(Q)echo "make git-ignore        - Setup files to be ignored by Git"
	$(Q)echo "make examples          - Builds examples"
	$(Q)echo "make cargo-exe         - Setup executable package"
	$(Q)echo "make cargo-lib         - Setup library package"
	$(Q)echo "make rust-ci-lib       - Setup Travis CI Rust library"
	$(Q)echo "make rust-ci-exe       - Setup Travis CI Rust executable"
	$(Q)echo "make rusti             - Setup 'rusti.sh' for interactive Rust"
	$(Q)echo "make watch             - Setup 'watch.sh' for compilation on save"
	$(Q)echo "make loc               - Count lines of code in src folder"
	$(Q)echo "make nightly-install   - Installs Rust nightly build"
	$(Q)echo "make nightly-uninstall - Uninstalls Rust nightly build"
	$(Q)echo "make clean             - Deletes binaries and documentation."
	$(Q)echo "make clear-project     - WARNING: Deletes project files except 'Makefile'"
	$(Q)echo "make clear-git         - WARNING: Deletes Git setup"
	$(Q)echo "make symlink-build     - Creates a script for building dependencies"
	$(Q)echo "make symlink-info      - Symlinked libraries dependency info"
	$(Q)echo "make target-dir        - Creates directory for current target"

.PHONY: \
		bench \
		bench-internal \
		bench-external \
		cargo-lib \
		cargo-exe \
		clean \
		clear-git \
		clear-project \
		loc \
		nightly-install \
		nightly-uninstall \
		run \
		rusti \
		rust-ci-lib \
		rust-ci-exe \
		symlink-build \
		symlink-info \
		target-dir \
		test \
		test-internal \
	    test-external \
		watch

nightly-install:
	$(Q)cd ~ \
	&& curl -s https://static.rust-lang.org/rustup.sh > rustup.sh \
	&& ( \
		echo "Rust install-script stored as '~/rustup.sh'" ; \
		read -p "Do you want to install? [y/n]:" -n 1 -r ; \
		echo "" ; \
		if [[ $$REPLY =~ ^[Yy]$$ ]] ; \
		then \
			cat rustup.sh | sudo sh -s -- --channel=nightly; \
		fi \
	)

nightly-uninstall:
	$(Q)cd ~ \
	&& curl -s https://static.rust-lang.org/rustup.sh > rustup.sh \
	&& ( \
		echo "Rust install-script stored as '~/rustup.sh'" ; \
		read -p "Do you want to uninstall? [y/n]:" -n 1 -r ; \
		echo "" ; \
		if [[ $$REPLY =~ ^[Yy]$$ ]] ; \
		then \
			cat rustup.sh | sudo sh -s -- --uninstall ; \
		fi \
	)

cargo-exe: $(EXE_ENTRY_FILE)
	$(Q)( \
		test -e Cargo.toml \
		&& echo "--- The file 'Cargo.toml' already exists" \
	) \
	|| \
	( \
		name=$${PWD##/*/} ; \
		echo -e "[package]\n\nname = \"$$name\"\nversion = \"0.0.0\"\nauthors = [\"Your Name <your@email.com>\"]\ntags = []\n\n[[bin]]\n\nname = \"$$name\"\npath = \"$(EXE_ENTRY_FILE)\"\n" > Cargo.toml \
		&& echo "--- Created 'Cargo.toml' for executable" \
		&& cat Cargo.toml \
	)

cargo-lib: $(LIB_ENTRY_FILE)
	$(Q)( \
		test -e Cargo.toml \
		&& echo "--- The file 'Cargo.toml' already exists" \
	) \
	|| \
	( \
		name=$${PWD##/*/} ; \
		echo -e "[package]\n\nname = \"$$name\"\nversion = \"0.0.0\"\nauthors = [\"Your Name <your@email.com>\"]\ntags = []\n\n[lib]\n\nname = \"$$name\"\npath = \"$(LIB_ENTRY_FILE)\"\n" > Cargo.toml \
		&& echo "--- Created 'Cargo.toml' for library" \
		&& cat Cargo.toml \
	)

rust-ci-lib: $(LIB_ENTRY_FILE)
	$(Q)( \
		test -e .travis.yml \
		&& echo "--- The file '.travis.yml' already exists" \
	) \
	|| \
	( \
		echo -e "install:\n  - wget http://static.rust-lang.org/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz -O - | sudo tar zxf - --strip-components 1 -C /usr/local\nscript:\n  - make lib\n" > .travis.yml \
		&& echo "--- Created '.travis.yml' for library" \
		&& cat .travis.yml \
	)

rust-ci-exe: $(EXE_ENTRY_FILE)
	$(Q)( \
		test -e .travis.yml \
		&& echo "--- The file '.travis.yml' already exists" \
	) \
	|| \
	( \
		echo -e "install:\n  - wget http://static.rust-lang.org/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz -O - | sudo tar zxf - --strip-components 1 -C /usr/local\nscript:\n  - make exe\n" > .travis.yml \
		&& echo "--- Created '.travis.yml' for executable" \
		&& cat .travis.yml \
	)

doc: $(SOURCE_FILES) | src/
	$(Q)$(RUSTDOC) $(LIB_ENTRY_FILE) -L "$(TARGET_LIB_DIR)" \
	&& echo "--- Built documentation"

run: exe
	$(Q)cd "$(EXE_DIR)/" \
	&& ./$(EXE_FILE)

target-dir: $(TARGET_LIB_DIR)

exe: $(EXE) | $(TARGET_LIB_DIR)

$(EXE): $(SOURCE_FILES) | $(EXE_DIR)/ $(EXE_ENTRY_FILE)
	$(Q)$(COMPILER) --target "$(TARGET)" $(COMPILER_FLAGS) $(EXE_ENTRY_FILE) -o $(EXE) -L "$(TARGET_LIB_DIR)" -L "target" \
	&& echo "--- Built executable" \
	&& echo "--- Type 'make run' to run executable"

test: test-internal test-external
	$(Q)echo "--- Internal tests succeeded" \
	&& echo "--- External tests succeeded"

test-external: $(EXE_DIR)/test-external
	$(Q)cd "$(EXE_DIR)/" \
	&& ./test-external

$(EXE_DIR)/test-external: $(SOURCE_FILES) | lib $(EXE_DIR)/ src/test.rs
	$(Q)$(COMPILER) --target "$(TARGET)" $(COMPILER_FLAGS) --test src/test.rs -o "$(EXE_DIR)/test-external" -L "$(TARGET_LIB_DIR)" -L "target" \
	&& echo "--- Built external test runner"

test-internal: $(EXE_DIR)/test-internal
	$(Q)cd "$(EXE_DIR)/" \
	&& ./test-internal

$(EXE_DIR)/test-internal: $(SOURCE_FILES) | lib src/ $(EXE_DIR)/
	$(Q)$(COMPILER) --target "$(TARGET)" $(COMPILER_FLAGS) --test $(LIB_ENTRY_FILE) -o "$(EXE_DIR)/test-internal" -L "$(TARGET_LIB_DIR)" -L "target" \
	&& echo "--- Built internal test runner"

bench: bench-internal bench-external

bench-external: test-external
	$(Q)$(EXE_DIR)/test-external --bench

bench-internal: test-internal
	$(Q)$(EXE_DIR)/test-internal --bench

lib:
	$(Q)( \
		cargo build \
		&& echo "--- Type 'make test' to test library" \
	) \
	|| \
	( \
		echo "--- Type 'make cargo-lib' to create Cargo.toml" \
	)

$(EXE_DIR)/:
	$(Q)mkdir -p $(EXE_DIR)

$(TARGET_LIB_DIR)/:
	$(Q)mkdir -p $(TARGET_LIB_DIR)

src/:
	$(Q)mkdir -p src

examples-dir:
	$(Q)test -e examples \
	|| \
	( \
		mkdir examples \
		&& echo -e "fn main() {\n\tprintln!(\"Hello!\");\n}\n" > examples/hello.rs \
		&& echo "--- Created examples folder" \
	)

rust-dir:
	$(Q)mkdir -p .rust

git-ignore:
	$(Q)( \
		test -e .gitignore \
		&& echo "--- The file '.gitignore' already exists" \
	) \
	|| \
	( \
		echo -e ".DS_Store\n*~\n*#\n*.o\n*.so\n*.swp\n*.old\n*.bak\n*.kate-swp\n*.dylib\n*.dSYM\n*.dll\n*.rlib\n*.dummy\n*.exe\n*-test\n/$(EXE)\n/$(EXE_DIR)/test-internal\n/$(EXE_DIR)/test-external\n/doc/\n/target/\n/build/\n/.rust/\nrusti.sh\nwatch.sh\n/examples/**\n!/examples/*.rs\n!/examples/assets/\n!/$(EXE_DIR)/assets/" > .gitignore \
		&& echo "--- Created '.gitignore' for git" \
		&& cat .gitignore \
	)

examples: $(EXAMPLE_FILES)

$(EXAMPLE_FILES): lib examples-dir
	$(Q)$(COMPILER) --target "$(TARGET)" $(COMPILER_FLAGS) $@ -L "$(TARGET_LIB_DIR)" -L "target" --out-dir examples/ \
	&& echo "--- Built '$@' (make $@)"

$(EXE_ENTRY_FILE): | src/
	$(Q)test -e $(EXE_ENTRY_FILE) \
	|| \
	( \
		name=$${PWD##/*/} ; \
		echo -e "#![crate_name = \"$$name\"]\n\nfn main() {\n\tprintln!(\"Hello world!\");\n}" > $(EXE_ENTRY_FILE) \
	)

src/test.rs: | src/
	$(Q)test -e src/test.rs \
	|| \
	( \
		touch src/test.rs \
	)

$(LIB_ENTRY_FILE): | src/
	$(Q)test -e $(LIB_ENTRY_FILE) \
	|| \
	( \
		name=$${PWD##/*/} ; \
		echo -e "#![crate_name = \"$$name\"]\n#![deny(missing_doc)]\n\n//! Documentation goes here.\n" > $(LIB_ENTRY_FILE) \
	)

clean:
	$(Q)cargo clean
	$(Q)rm -rf "doc/"
	$(Q)rm -f "$(EXE)"
	$(Q)rm -f "$(EXE_DIR)/test-internal"
	$(Q)rm -f "$(EXE_DIR)/test-external"
	$(Q)echo "--- Deleted binaries and documentation"

clear-project:
	$(Q)rm -f ".symlink-info"
	$(Q)rm -f "Cargo.toml"
	$(Q)rm -f "Cargo.lock"
	$(Q)rm -f ".travis.yml"
	$(Q)rm -f "rusti.sh"
	$(Q)rm -f "watch.sh"
	$(Q)rm -rf "target/"
	$(Q)rm -rf "src/"
	$(Q)rm -rf "$(EXE_DIR)/"
	$(Q)rm -rf "examples/"
	$(Q)rm -rf "doc/"
	$(Q)echo "--- Removed all source files, binaries and documentation" \
	&& echo "--- Content in project folder" \
	&& ls -a

clear-git:
	$(Q)rm -f ".gitignore"
	$(Q)rm -rf ".git"
	$(Q)echo "--- Removed Git" \
	&& echo "--- Content in project folder" \
	&& ls -a

# borrowed from http://stackoverflow.com/q/649246/1256624
define RUSTI_SCRIPT
#!/bin/bash

#written by mcpherrin

while true; do
  echo -n "> "
  read line
  TMP="`mktemp r.XXXXXX`"
  $(COMPILER) - -o $$TMP -L "$(TARGET_LIB_DIR)" <<EOF
  #![feature(globs, macro_rules, phase, struct_variant)]
  extern crate arena;
  extern crate collections;
  extern crate flate;
  #[phase(syntax)] extern crate fourcc;
  extern crate glob;
  extern crate green;
  extern crate hexfloat;
  extern crate libc;
  #[phase(syntax, link)] extern crate log;
  extern crate native;
  extern crate num;
  extern crate rand;
  extern crate regex;
  #[phase(syntax)] extern crate regex_macros;
  extern crate rustc;
  extern crate rustdoc;
  extern crate rustuv;
  extern crate semver;
  extern crate serialize;
  extern crate sync;
  extern crate syntax;
  extern crate term;
  extern crate test;
  extern crate time;
  extern crate url;
  extern crate uuid;
  extern crate workcache;

  fn main() {
      let r = { $$line };
      println!("{:?}", r);
  }
EOF
  ./$$TMP
  rm $$TMP
done
endef
export RUSTI_SCRIPT

rusti: $(TARGET_LIB_DIR)
	$(Q)( \
		test -e rusti.sh \
		&& echo "--- The file 'rusti.sh' already exists" \
	) \
	|| \
	( \
		echo -e "$$RUSTI_SCRIPT" > rusti.sh \
		&& chmod +x rusti.sh \
		&& echo "--- Created 'rusti.sh'" \
		&& echo "--- Type './rusti.sh' to start interactive Rust" \
	)

# borrowed from http://stackoverflow.com/q/649246/1256624
define WATCH_SCRIPT
#!/bin/bash

#written by zzmp

# This script will recompile a rust project using `make`
# every time something in the specified directory changes.

# Watch files in infinite loop
watch () {
  UNAME=$$(uname)
  if [ -e "$$2" ]; then
    echo "Watching files in $$2.."
    CTIME=$$(date "+%s")
    while :; do
      sleep 1
      for f in `find $$2 -type f -name "*.rs"`; do
        if [[ $$UNAME == "Darwin" ]]; then
          st_mtime=$$(stat -f "%m" "$$f")
        elif [[ $$UNAME == "FreeBSD" ]]; then
          st_mtime=$$(stat -f "%m" "$$f")
        else
          st_mtime=$$(stat -c "%Y" "$$f")
        fi
        if [ $$st_mtime -gt $$CTIME ]; then
          CTIME=$$(date "+%s")
          echo "~~~ Rebuilding"
          $$1
          if [ ! $$? -eq 0 ]; then
            echo ""
          fi
        fi
      done
    done
  else
    echo "$$2 is not a valid directory"
  fi
}

# Capture user input with defaults
CMD=$${1:-make}
DIR=$${2:-src}

if [ $${CMD:0:2} = '-h' ]; then
echo '
This script will recompile a rust project using `make`
every time something in the specified directory changes.

Use: ./watch.sh [CMD] [DIR]
Example: ./watch.sh "make run" src

CMD: Command to execute
     Complex commands may be passed as strings
     `make` by default
DIR: Directory to watch
     src by default

If DIR is supplied, CMD must be as well.\n'
else
  watch "$$CMD" "$$DIR"
fi

endef
export WATCH_SCRIPT

watch: $(TARGET_LIB_DIR)
	$(Q)( \
		test -e watch.sh \
		&& echo "--- The file 'watch.sh' already exists" \
	) \
	|| \
	( \
		echo -e "$$WATCH_SCRIPT" > watch.sh \
		&& chmod +x watch.sh \
		&& echo "--- Created 'watch.sh'" \
		&& echo "--- Type './watch.sh' to start compilation on save" \
		&& echo "--- Type './watch.sh -h' for more options" \
	)

# borrowed from http://stackoverflow.com/q/649246/1256624
define SYMLINK_BUILD_SCRIPT
#!/bin/bash
# written by bvssvni
# Modify the setting to do conditional compilation.
# For example "--cfg my_feature"
SETTINGS=""
# ================================================

MAKE=make
if [ "$$OS" == "Windows_NT" ]; then
    MAKE=mingw32-make
fi

# Checks if an item exists in an array.
# Copied from http://stackoverflow.com/questions/3685970/check-if-an-array-contains-a-value
function contains() {
    local n=$$#
    local value=$${!n}
    for ((i=1;i < $$#;i++)) {
        if [ "$${!i}" == "$${value}" ]; then
            echo "y"
            return 0
        fi
    }
    echo "n"
    return 1
}

# This is a counter used to insert dependencies.
# It is global because we need an array of all the
# visited dependencies.
i=0
function build_deps {
    local current=$$(pwd)
    for symlib in $$(find $(TARGET_LIB_DIR) -type l) ; do
        cd $$current
        echo $$symlib
        local original_file=$$(readlink $$symlib)
        local original_dir=$$(dirname $$original_file)
        cd $$original_dir

        # Go to the git root directory.
        local current_git_dir=$$(git rev-parse --show-toplevel)
        echo "--- Parent $$current"
        echo "--- Child $$current_git_dir"
        cd $$current_git_dir

        # Skip building if it is already built.
        if [ $$(contains "$${git_dir[@]}" $$current_git_dir) == "y" ]; then
            echo "--- Visited $$current_git_dir"
            continue
        fi

        # Remember git directory to not build it twice
        git_dir[i]=$$current_git_dir
        let i+=1

        # Visit the symlinks and build the dependencies
        build_deps
        
		echo "--- Building $$current_git_dir" \

        # First check for a 'build.sh' script with default settings.
        # Check for additional 'rust-empty.mk' file. \
        # Compile with the settings flags. \
        # If no other options, build with make.
        ( \
            test -e build.sh \
            && ./build.sh \
        ) \
        || \
        ( \
            test -e rust-empty.mk \
            && $$MAKE -f rust-empty.mk clean \
            && $$MAKE -f rust-empty.mk \
        ) \
        || \
        ( \
			test -e Makefile \
            && $$MAKE clean \
            && $$MAKE \
        ) \
		|| \
		( \
			test -e Cargo.toml \
			&& cargo build \
		) \
		|| \
		( \
			echo "--- ERROR: Missing Makefile in $$current_git_dir" \
		)
    done
    cd $$current
}

# Mark main project as visited to avoid infinite loop.
git_dir[i]=$$(pwd)
let i+=1
if [ "$$1" == "deps" ]; then
    build_deps
fi

echo "--- Building $$(pwd)"
( \
    test -e rust-empty.mk \
    && $$MAKE -f rust-empty.mk clean \
    && $$MAKE -f rust-empty.mk COMPILER_FLAGS+="$$SETTINGS" \
) \
|| \
( \
    $$MAKE clean
    $$MAKE COMPILER_FLAGS+="$$SETTINGS"
)

endef
export SYMLINK_BUILD_SCRIPT

symlink-build:
	$(Q)( \
		test -e build.sh \
		&& echo "--- The file 'build.sh' already exists" \
	) \
	|| \
	( \
		echo -e "$$SYMLINK_BUILD_SCRIPT" > build.sh \
		&& chmod +x build.sh \
		&& echo "--- Created 'build.sh'" \
		&& echo "--- Type './build.sh deps' to build everything" \
	)

loc:
	$(Q)echo "--- Counting lines of .rs files in 'src' (LOC):" \
	&& find src/ -type f -name "*.rs" -exec cat {} \; | wc -l

# Finds the original locations of symlinked libraries and
# prints the commit hash with remote branches containing that commit.
symlink-info:
	$(Q)	current=$$(pwd) ; \
	for symlib in $$(find $(TARGET_LIB_DIR) -type l) ; do \
		cd $$current ; \
		echo $$symlib ; \
		original_file=$$(readlink $$symlib) ; \
		original_dir=$$(dirname $$original_file) ; \
		cd $$original_dir ; \
		commit=$$(git rev-parse HEAD) ; \
		echo $$commit ; \
		echo "origin:" ; \
		git config --get remote.origin.url ; \
		echo "upstream:" ; \
		git config --get remote.upstream.url ; \
		echo "available in remote branches:" ; \
		git branch -r --contains $$commit ; \
		echo "" ; \
	done \
	> .symlink-info \
	&& cd $$current \
	&& echo "--- Created '.symlink-info'" \
	&& cat .symlink-info