How I Learned To Stop Worrying And Love LSP (And Metals)

A talk given at ScalaUA '20 - Ukrainian annual conference on Scala and it's ecosystem.
Youtube link - https://www.youtube.com/watch?v=x7ey0ifcqAg

Transcript

1. HOW I LEARNED TO STOP WORRYING AND HOW I LEARNED TO STOP WORRYING AND LOVE LSP LOVE LSP AND EMACS 😜 AND EMACS 😜 1
2. TABLE OF CONTENTS TABLE OF CONTENTS Intro Why should you care? What is LSP? Set up Usage Caveats and Tips What's next? 2 . 1
3. 1 1 INTRO INTRO 3 . 1
4. WHY I WANT TO SHARE IT WITH YOU WHY I WANT TO SHARE IT WITH YOU 3 . 2
5. WHY I WANT TO SHARE IT WITH YOU WHY I WANT TO SHARE IT WITH YOU Story from the guy who is actually happy and uses something else then IntelliJ 3 . 2
6. We spend more then 50% of time either coding or reading the code 3 . 3
7. We spend more then 50% of time either coding or reading the code "Can I use Emacs for most of the stuff?" 3 . 3
8. We spend more then 50% of time either coding or reading the code "Can I use Emacs for most of the stuff?" "Emacs+LSP! This is what I was looking for!" 3 . 3
9. IT'S NOT IDEAL IT'S NOT IDEAL 3 . 4
10. IT'S NOT IDEAL IT'S NOT IDEAL Not everything works as I would like it to work 3 . 4
11. IT'S NOT IDEAL IT'S NOT IDEAL Not everything works as I would like it to work Where LSP doesn't work, Emacs backs up. 3 . 4
12. WHO AM I AND WHAT I DO WHO AM I AND WHAT I DO Data engineer / Team Lead at With Emacs 3+ years With LSP 0,5 year romexsoft.com 3 . 5
13. 2 2 WHY SHOULD YOU CARE? WHY SHOULD YOU CARE? 4 . 1
14. CASE#1 CASE#1 You have recently switched to a new project or involving in other parts of the system on your project different language different tools different work ow … mental switch overhead 4 . 2
15. CASE#2 CASE#2 You have a codebase of 10+ laguages you should navigate through keep around 3/4/5 different editors/IDEs switching context blowing up your hardware 4 . 3
16. CASE#3 CASE#3 You want to learn new language should probably learn a new IDE 4 . 4
17. LANGUAGES AND EDITORS LANGUAGES AND EDITORS 4 . 5
18. 3 3 WHAT IS LSP? WHAT IS LSP? Language Server Protocol 5 . 1
19. 3 3 WHAT IS LSP? WHAT IS LSP? Language Server Protocol Common protocol between language and editor 5 . 1
20. 3 3 WHAT IS LSP? WHAT IS LSP? Language Server Protocol Common protocol between language and editor IDE-like functionality speci cation hover / inspection / doc goto / navigation / nd symbol completion code-check / diagnostics run/debug … 5 . 1
21. LSP VS. NO-LSP LSP VS. NO-LSP 5 . 2
22. PROTOCOL PROTOCOL 5 . 3
23. LSP-MODE & EMACS LSP-MODE & EMACS https://github.com/emacs-lsp/lsp-mode#supported- languages 5 . 4
24. METALS METALS
25. 5 . 5
26. 4 4 SET UP SET UP
27. Metals metals binary sbt and bloop set up (optional) LSP in Emacs lsp-mode lsp-ui lsp-treemacs company-lsp flycheck dap-mode … https://scalameta.org/metals/ 6 . 1
28. 5 5 USAGE USAGE 7 . 1
29. 5 5 USAGE USAGE hover 7 . 1
30. 5 5 USAGE USAGE hover highlight 7 . 1
31. 5 5 USAGE USAGE hover highlight doc-ui 7 . 1
32. 5 5 USAGE USAGE hover highlight doc-ui diagnostics 7 . 1
33. code navigation (local, workspace) 7 . 2
34. code navigation (local, workspace) de nition on point 7 . 2
35. code navigation (local, workspace) de nition on point references 7 . 2
36. code navigation (local, workspace) de nition on point references implementations 7 . 2
37. code navigation (local, workspace) de nition on point references implementations workspace symbol 7 . 2
38. code navigation (local, workspace) de nition on point references implementations workspace symbol lsp-ui-peek 7 . 2
39. treeview/sideline 7 . 3
40. treeview/sideline imenu 7 . 3
41. treeview/sideline imenu treemacs error view symbols call hierarchy packages class structure 7 . 3
42. code-check 7 . 4
43. code-check flycheck 7 . 4
44. completion 7 . 5
45. completion company 7 . 5
46. completion company yasnippet 7 . 5
47. code actions 7 . 6
48. code actions rename 7 . 6
49. code actions rename import 7 . 6
50. run/test/debug/sbt 7 . 7
51. run/test/debug/sbt lsp-lens 7 . 7
52. run/test/debug/sbt lsp-lens dap 7 . 7
53. 6 6 CAVEATS AND TIPS CAVEATS AND TIPS 8 . 1
54. LSP TIPS LSP TIPS 8 . 2
55. LSP TIPS LSP TIPS Navigation doesn't always work suggest: LSP navigation for local / workspace quick look keep major lib sources checked out on side 8 . 2
56. The whole LSP sometimes stops working see lsp-log, lsp-log-io restart session re-import build (sbt) 8 . 3
57. Files compile on explicit save 8 . 4
58. completion you can de ne yas for most of the bulk boilerplate 8 . 5
59. Scala/sbt keep hot sbt session for bloopInstall manage LSP sessions explicitly LSP doesn't work for sbt project les 8 . 6
60. LSP and Emacs keep an eye on your package versions 8 . 7
61. Metals metals server parameters 8 . 8
62. Limitations multiple servers management le watchers 8 . 9
63. EMACS TIPS EMACS TIPS For those more familiar with Emacs 8 . 10
64. EMACS TIPS EMACS TIPS For those more familiar with Emacs Or to inspire you 8 . 10
65. Vanilla Emacs is too raw to be used out of the box You need to learn a little Elisp anyway (even with LSP clean install) 8 . 11
66. Bindings, completion evil everywhere evil-leader and <space> normal mode and <space> as dispatcher whichkey and help hydra ivy 8 . 12
67. Files, projects, buffers, search projectile swiper and counsel grep replace treemacs, dired 8 . 13
68. magit (omg this is awesome) timemachine github support 8 . 14
69. flycheck 8 . 15
70. Completion company vs complete-at-point vs yas <tab> and indent 8 . 16
71. Other 8 . 17
72. Other ace 8 . 17
73. Other ace super-save 8 . 17
74. Other ace super-save org-mode, capture, ox-reveal 8 . 17
75. Other ace super-save org-mode, capture, ox-reveal docker 8 . 17
76. Other ace super-save org-mode, capture, ox-reveal docker doomline 8 . 17
77. Other ace super-save org-mode, capture, ox-reveal docker doomline all-the-icons, company-box 8 . 17
78. Other ace super-save org-mode, capture, ox-reveal docker doomline all-the-icons, company-box package management and init.el 8 . 17
79. 7 7 WHAT'S NEXT? WHAT'S NEXT? get Metals & LSP - get Emacs - get my con g - scalameta.org/metals/ www.gnu.org/software/emacs/download.html github.com/thatwist/.emacs.d 9 . 1
80. 😃 😃 10 . 1