buil Create a task that generates a tar.gz package

* Rakefile: Create a task to generate a tar.gz package and add DESTDIR
environment variable to the install task. Both changes help when
generating packages for Linux distributions.

2 files changed, 32 insertions, 4 deletions

diff --git a/.gitignore b/.gitignore
index ba64cb7..2e00ba6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 candy_gear
 doc
+pkg
 
-*.o
\ No newline at end of file
+*.o
diff --git a/Rakefile b/Rakefile
index 48ecab3..ef51ee2 100644
--- a/Rakefile
+++ b/Rakefile
@@ -17,11 +17,16 @@ require 'rake/loaders/makefile'
 
 OBJ = 'candy_gear'
 
+VERSION = '0.1.0'
+
 DATA_DIR = '/usr/local/share/candy_gear'
 
 C_FILES = FileList[
   'src/*.c'
 ]
+C_H_FILES = FileList[
+  'src/*.h'
+]
 C_OBJS = C_FILES.ext('.o')
 
 CPP_FILES = FileList[
@@ -57,6 +62,25 @@ rule '.o' => ['.cpp'] do |t|
   `g++ -c -std=c++17 #{t.source} -o #{t.name}`
 end
 
+task :pkg do
+  name = "#{OBJ}-#{VERSION}"
+  files =
+    FileList[
+      'CODE_OF_CONDUCT.markdown',
+      'Doxyfile',
+      'LICENSE.txt',
+      'Rakefile',
+      'README.markdown'
+    ] +
+    C_FILES +
+    C_H_FILES +
+    CPP_FILES +
+    RB_LIBS
+
+  `mkdir -p pkg`
+  `tar -czvf pkg/#{name}.tar.gz --transform 's,^,#{name}/,' #{files}`
+end
+
 task build: OBJ_FILES do
   libs = LIBRARIES.inject('') {_1 + "-l#{_2} "}
 
@@ -64,9 +88,12 @@ task build: OBJ_FILES do
 end
 
 task :install do
-  `install #{OBJ} /usr/local/bin`
-  `install -d #{DATA_DIR}/lib`
-  RB_LIBS.each {`install #{_1} #{DATA_DIR}/lib`}
+  destdir = ENV['DESTDIR'] || ''
+
+  `install -d #{destdir}/usr/local/bin`
+  `install #{OBJ} #{destdir}/usr/local/bin`
+  `install -d #{destdir}#{DATA_DIR}/lib`
+  RB_LIBS.each {`install #{_1} #{destdir}#{DATA_DIR}/lib`}
 end
 
 task default: %[build]