Winning the Erlang Edit•Build•Test Cycle
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The document discusses tips for improving developer productivity by optimizing the edit-build-test cycle. It presents several tools that can help speed up and streamline the development workflow, such as PeepOpen for navigating code, Kerl for managing Erlang versions, Rebar for simplifying build processes, Mochiweb Reloader for automatic reloading of code changes, and Sync for automatic compilation and reloading without using the shell. It also recommends writing unit tests with EUnit and Cover to catch errors and measure code coverage. The overall message is that by reducing inefficiencies in the edit-build-test cycle through these kinds of tools, developers can significantly increase the progress they are able to make.
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Winning the Erlang Edit•Build•Test Cycle
- 1. Winning the Edit•Build•Test Cycle Rusty Klophaus • @rustyio Basho Technologies
- 2. The Edit•Build•Test Cycle determines how quickly you can see the results of new code in your application.
- 3. Developer Productivity How much progress can a developer make on a problem in some interval of time. Intelligence X Knowledge / Experience X Typing Speed X Edit•Build•Test Cycle = Developer Productivity (Simplified) 3
- 4. Developer Productivity How much progress can a developer make on a problem in some interval of time. Intelligence X Knowledge / Experience X Typing Speed X Edit•Build•Test Cycle = Developer Productivity (Simplified) 4
- 5. Developer Productivity How much progress can a developer make on a problem in some interval of time. Intelligence X Knowledge / Experience X Typing Speed X Easy to improve Edit•Build•Test Cycle = Developer Productivity (Simplified) 4
- 6. Developer Productivity How much progress can a developer make on a problem in some interval of time. Intelligence X Knowledge / Experience X Typing Speed X Easy to improve Edit•Build•Test Cycle Transferrable to other projects = Developer Productivity (Simplified) 4
- 7. Developer Productivity How much progress can a developer make on a problem in some interval of time. Intelligence X Knowledge / Experience X Typing Speed X Easy to improve Edit•Build•Test Cycle Transferrable to other projects = Developer Productivity Transferrable to other people (Simplified) 4
- 8. How do we “win” it? 5
- 9. How do we win it? SPEED POWER CONSISTENCY 6
- 10. How do we win it? Waste Less Time SPEED POWER CONSISTENCY 6
- 11. How do we win it? Waste Less Time SPEED Shorter Iterations POWER CONSISTENCY 6
- 12. How do we win it? Waste Less Time SPEED Shorter Iterations Maintain Focus POWER CONSISTENCY 6
- 13. How do we win it? Waste Less Time SPEED Shorter Iterations Maintain Focus POWER Find Points of Leverage CONSISTENCY 6
- 14. How do we win it? Waste Less Time SPEED Shorter Iterations Maintain Focus POWER Find Points of Leverage Avoid Re-invention CONSISTENCY 6
- 15. How do we win it? Waste Less Time SPEED Shorter Iterations Maintain Focus POWER Find Points of Leverage Avoid Re-invention CONSISTENCY Easy Onboarding 6
- 16. Edit•Build•Test 7
- 17. Tip 1: Navigating a Project Tool • PeepOpen (Mac only, not free) • Works with BBEdit, Coda, Emacs, MacVim, TextMate, XCode • http://peepcode.com/products/peepopen What It Does • Find and open files quickly 8
- 18. Tip 1: Navigating a Project 9
- 19. Tip 2: Erlang Documentation Tool • ErlDocs.com What It Does • Searchable Erlang documentation • Offline version 10
- 20. Tip 2: Erlang Documentation 11
- 21. Edit•Build•Test 12
- 22. Tip 3: Manage Erlang Versions Tool • Kerl - Erlang Version Manager • https://github.com/spawngrid/kerl What It Does • Manage multiple Erlang installations • rbenv / rvm / nvm for Erlang 13
- 23. Tip 3: Manage Erlang Versions # Install kerl utility... curl -O https://raw.github.com/spawngrid/ kerl/master/kerl chmod 755 kerl sudo mv kerl /usr/local/bin # Build and install the R14B03 release... kerl build R14B03 r14b03 kerl install r14b03 /opt/erlang/r14b03 # Activate a release . /opt/erlang/r14b03/activate 14
- 24. Tip 4: Simplify Your Makefile Tool • Rebar - Simple-yet-sophisticated build tool • https://github.com/basho/rebar What It Does • Simplify our Makefile • Will build *anything* if you follow OTP conventions • Fetch project dependencies • And more... 15
- 25. Tip 4: Simplify Your Makefile # Rebar simplifies your Makefile. # (NOTE: Include rebar in your repo.) all: deps compile compile: ./rebar get-deps compile clean: ./rebar clean rel: ./rebar generate 16
- 26. Dependencies %% FILE: rebar.config {sub_dirs, ["rel", "deps/myproject"]}. {deps, [ {webmachine, "1.9.0", { git, "git://github.com/basho/webmachine", {tag, "1.9.0"} }} ]}. 17
- 27. Tip 4: Simplify Your Makefile $ make ./rebar get-deps compile ==> rel (get-deps) ==> myproject (get-deps) ==> MyProject (get-deps) Pulling webmachine from {git,"git://github.com/basho/webmachine", {tag,"1.9.0"}} Cloning into webmachine... ==> webmachine (get-deps) Pulling mochiweb from {git,"git://github.com/mochi/mochiweb",{tag,"1.5.1"}} Cloning into mochiweb... ==> mochiweb (get-deps) ==> mochiweb (compile) Compiled src/mochiweb_sup.erl ...snip... ==> webmachine (compile) Compiled src/webmachine_util.erl ...snip... ==> rel (compile) ==> MyProject (compile) Compiled src/myproject_app.erl Compiled src/myproject_sup.erl
- 28. Tip 5: Stay in the Zone 19
- 29. Tip 5: Stay in the Zone Doesn’t realize his code finished compiling... 19
- 30. Tip 5: Stay in the Zone Doesn’t realize his code finished compiling... 20 minutes ago. 19
- 31. Tip 5: Stay in the Zone # Get alerted when `make` is finished. # Drop this in your .bashrc function make { /usr/bin/make "$@" say "Finished make $1" } 20
- 32. Tip 5: Stay in the Zone # Get alerted when `make` is finished. # Drop this in your .bashrc function make { START=$SECONDS /usr/bin/make "$@" ELAPSED=`echo $SECONDS - $START | bc` growlnotify -n "make" "Finished make $1!" -m "Took $ELAPSED seconds." } 21
- 33. Tip 6: Avoid VM Restarts Tool • Mochiweb Reloader What It Does • Automatically reload new beams 22
- 34. Tip 6: Avoid VM Restarts $ erl -pa deps/*/ebin Eshell V5.8.4 (abort with ^G) 1> % Start the reloader. 1> reloader:start(). 2> % Ensure mymodule is loaded 2> code:ensure_loaded(mymodule). 3> % Edit and compile mymodule.erl 3> % and Mochiweb reloader will reload it. Reloading myproject_sup ... ok. 23
- 35. Tip 7: Avoid the Shell Tool • Sync • https://github.com/rustyio/Sync What It Does • Automatically recompile new code • Automatically reload new beams • Growl (or notify) the results 24
- 36. Tip 7: Avoid the Shell %% Pull http://github.com/rustyio/Sync into %% ERL_LIBS path and compile. %% Then, start sync within your project. %% Make sure erl is started with `-mode interactive`, %% not `-mode embedded`. sync:go(). Starting Sync (Automatic Code Compiler / Reloader) Scanning source files... ok =INFO REPORT==== 10-Oct-2011::10:37:58 === /Users/rusty/Documents/Code/MyProject/src/ myproject_sup.erl:0: Recompiled. =INFO REPORT==== 10-Oct-2011::10:37:58 === myproject_sup: Reloaded! (Beam changed.) 25 Reloading myproject_sup ... ok.
- 37. Tip 7: Avoid the Shell Growl Notifications Success! Warning! Error! 26
- 38. Edit•Build•Test 27
- 39. Tip 8: Unit Testing + Coverage Tool • Rebar + EUnit + Cover Goals • Run tests for all dependencies • Run tests for a specific dependency • Run tests for a specific module • Include a coverage report 28
- 40. Tip 8: Unit Testing + Coverage ./rebar eunit app=mochiweb suite=mochijson2 ==> mochiweb (eunit) ======================== EUnit ======================== module 'mochijson2' mochijson2: decode_test...[0.001 s] ok ...snip... [done in 0.044 s] =================================== ==================== All 14 tests passed. Cover analysis: /Users/rusty/Documents/Code/ MyProject/deps/mochiweb/.eunit/index.html ==> webmachine (eunit) ==> rel (eunit) ==> myproject (eunit) 29 ==> MyProject (eunit)
- 41. Tip 8: Unit Testing + Coverage 30
- 42. In Closing... 31
- 43. Think about your workflow. Fix the rough edges. You’re worth it.
- 44. Thanks! Rusty Klophaus • @rustyio Basho Technologies
Notes de l'éditeur
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- Of course, this is a simplified few, doesn’t mention anything about level of focus, or whether the developer is working on the *right* things. \n\nOr, maybe we can assume that that’s covered under “Intelligence” and “Knowledge”\n
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- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
- Waste Less Time - Don’t spend as long staring at screen, twiddling thumbs.\nShorter Iterations - Get feedback more often, make sure we are on the right track\nMaintain Focus - A byproduct of thumb twiddling is that you get distracted and start reading blogs.\n\nLeverage Points - Automation. Find ways to do a lot with a little. This leads to a feeling of traction, excitement, longer focus, and more productivity.\n\nConsistency - Repeatable process is faster than starting from scratch. Remove the temptation to fiddle with tools each time we start a new project.\nEasy Onboarding - Others can join in without having to relearn the system.\n
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