A naïve introduction to mruby

Slides from a short talk given to the Tampa Ruby Brigade on August 21, 2014.

1. mruby A naïve introduction to
2. Embedded Devices Native Applications Scripting Applications
3. Know some Ruby Know some C Know Japanese Getting Started
4. Ask Google: “mruby [ANYTHING]”
5. < 128kb
7. `require`
8. stdlib
9. mrbgems
10. mruby-array-ext mruby-bin-mirb mruby-bin-mruby-config mruby-bin-mruby mruby-bin-strip mruby-enum-ext mruby-enum-lazy mruby-enumerator mruby-eval mruby-exit mruby-fiber mruby-hash-ext mruby-kernel-ext mruby-math mruby-numeric-ext mruby-object-ext mruby-objectspace mruby-print mruby-proc-ext mruby-random mruby-range-ext mruby-sprintf mruby-string-ext mruby-string-utf8 mruby-struct mruby-symbol-ext mruby-time mruby-toplevel-ext
11. MRuby::Build.new do |conf| toolchain :gcc conf.gem :core => 'mruby-bin-mirb' conf.gem :core => 'mruby-bin-mruby' conf.gem :core => 'mruby-print' conf.gem :core => 'mruby-proc-ext' conf.gem :core => 'mruby-sprintf' conf.gem :core => 'mruby-time' ! conf.gem :git => 'https://github.com/iij/mruby-io.git' conf.gem :git => 'https://github.com/iij/mruby-mtest.git' conf.gem :git => 'https://github.com/iij/mruby-socket.git' end build_config.rb
12. Many Ways
13. Interpreted $ mruby hello_world.rb Hello, World. ! $ mruby -e “Hello, World!” Hello, World.
14. Interactive Shell (mirb) $ mirb mirb - Embeddable Interactive Ruby Shell ! > puts "Hello, World!" Hello, World! => nil
15. Bytecode (*.mrb) $ mrbc hello_world.rb $ cat -v hello_world.mrb RITE0002&? ^@^@^@gMATZ0000IREP^@^@^@I0000^@^@^@=^@^A^@^D^@ ^@^@^@^@^D^@M-^@^@^F^A^@^@=^@M-^@^@? ^@^@^@J^@^@^@^A^@^@^MHello, World! ^@^@^@^A^@^Dputs^@END^@^@^@^@^H% $ mruby -b hello_world.mrb Hello, World!
16. Binary C Code $ mrbc -B hello_world_bin hello_world.h $ cat hello_world.h const char hello_world_bin[] ={ 0x52,0x49,0x54,0x45,0x30,0x30,0x30,0x39,0x30,0x 30,0x30,0x30,0x30,0x30,0x30,0x39,… };
17. Binary C Code #include <mruby.h>! #include <mruby/irep.h>! ! #include “hello_world.h”! ! int main(void)! {! mrb_state *mrb;! mrb = mrb_open();! mrb_load_irep(mrb, hello_world_bin);! mrb_close(mrb);! return 0;! }
18. Running Ruby from C // car = Car! // car.run! struct RClass *Car = mrb_class_get(mrb, "Car");! mrb_value merv = mrb_class_new_instance(mrb, 0, NULL, Car);! mrb_funcall(mrb, car, "run", 0, NULL);!
19. CODE SPELUNKING github.com/ambethia/merv