$ opam user-setup install
below cmd output started 2022 Sat Dec 17 04:34:48 PM PST
Opam plugin "user-setup" is not installed. Install it on the current switch? [Y/n] y
The following actions will be performed:
- install user-setup 0.7
<><> Processing actions <><><><><><><><><><><><><><><><><><><><><><><><><><><><>
-> retrieved user-setup.0.7 (https://opam.ocaml.org/cache)
-> installed user-setup.0.7
Done.
<><> user-setup.0.7 installed successfully ><><><><><><><><><><><><><><><><><><>
=> To setup or update your editors, run 'opam user-setup install'.
<><> Carrying on to "opam user-setup install" <><><><><><><><><><><><><><><><><>
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
[WARNING] var was deprecated in version 2.1 of the opam CLI. Use opam var instead or set OPAMCLI environment variable to 2.0.
ocamltop > base > .ocamlinit: adding configuration
vim > .vimrc: already exists, not installing base template
vim > base > .vimrc: manual changes: leaving as is
vim > ocp-indent > .vimrc: adding configuration
above cmd output done 2022 Sat Dec 17 04:35:09 PM PST
dstromberg@tp-mini-c:~ x86_64-pc-linux-gnu 2670
$ vi ~/.vimrc
below cmd output started 2022 Sat Dec 17 04:36:58 PM PST
Error detected while processing /home/dstromberg/.vimrc:
line 231:
E121: Undefined variable: s:opam_available_tools
E116: Invalid arguments for function count(s:opam_available_tools,"ocp-indent") == 0
Press ENTER or type command to continue
I tried Googling for “Undefined variable: s:opam_available_tools”, but didn’t find anything relevant-looking.
What do I need to do to set up my .vimrc for use with OCaml?
Could you provide a snippet from your ~/.vimrc that includes how opam_available_tools is assigned a value?
PS. This might be overkill for what you are trying to achieve but a member of the community put together a good write-up on his vim setup here: NeoVim setup in Lua for OCaml
I don’t think my ~/.vimrc has opam_available_tools set to anything. And IINM, that’s the problem, but I don’t know what should be setting it.
The added lines look like just:
" ## added by OPAM user-setup for vim / ocp-indent ## 30bd5f8afb57b9f71e92b9f9bb2671a8 ## you can edit, but keep this line
if count(s:opam_available_tools,"ocp-indent") == 0
source "/home/dstromberg/.opam/default/share/ocp-indent/vim/indent/ocaml.vim"
endif
" ## end of OPAM user-setup addition for vim / ocp-indent ## keep this line
I wound up uncommenting what I used last time I looked (very briefly) at OCaml:
" OCaml!
" This is from https://github.com/ocaml/merlin/wiki/vim-from-scratch :
let g:syntastic_ocaml_checkers = ['merlin']
" ## added by OPAM user-setup for vim / base ## 93ee63e278bdfc07d1139a748ed3fff2 ## you can edit, but keep this line
let s:opam_share_dir = system("opam config var share")
let s:opam_share_dir = substitute(s:opam_share_dir, '[\r\n]*$', '', '')
let s:opam_configuration = {}
function! OpamConfOcpIndent()
execute "set rtp^=" . s:opam_share_dir . "/ocp-indent/vim"
endfunction
let s:opam_configuration['ocp-indent'] = function('OpamConfOcpIndent')
function! OpamConfOcpIndex()
execute "set rtp+=" . s:opam_share_dir . "/ocp-index/vim"
endfunction
let s:opam_configuration['ocp-index'] = function('OpamConfOcpIndex')
function! OpamConfMerlin()
let l:dir = s:opam_share_dir . "/merlin/vim"
execute "set rtp+=" . l:dir
endfunction
let s:opam_configuration['merlin'] = function('OpamConfMerlin')
let s:opam_packages = ["ocp-indent", "ocp-index", "merlin"]
let s:opam_check_cmdline = ["opam list --installed --short --safe --color=never"] + s:opam_packages
let s:opam_available_tools = split(system(join(s:opam_check_cmdline)))
for tool in s:opam_packages
" Respect package order (merlin should be after ocp-index)
if count(s:opam_available_tools, tool) > 0
call s:opam_configuration[tool]()
endif
endfor
" ## end of OPAM user-setup addition for vim / base ## keep this line
It might be a good idea to make A First Hour with OCaml · OCaml Tutorials work smoothly though - I imagine with the release of OCaml 5.0.0, there will be some newcomers (like me).
For formatting, ocp-indent is… still working but (afaik) not maintained, or in a bug-fixes-only mode.
My recommendation is to remove ocp-indent, and use ocamlformat instead. It works “out of the box” and allows for some tweaks. Add a .ocamlformat file to your project root and insert
profile = default
version = 0.24.1
to the file. Then you can format your entire project easily. Dune also has ocamlformat support. Personally i have mapped localleader F to format the current buffer (i use neovim, and bind to vim.lsp.buf.format()).
Edit. You could have a look at LSP instead of binding to merlin. LSP has all kinds of goodies, and neovim has an builtin LSP client. You just need to install the lsp server for ocaml. If you are on vanilla vim CoC is a good alternative. But there are a few other client implementations too.
I’m sorry if that derails the discussion further, since it actually doesn’t fix the initial problem But I can second the recommendation for using the OCaml LSP, especially with Neovim.
My current configuration has almost no OCaml specific settings anymore and mainly follows the init.lua of the kickstart config repo. It is a “ready-to-go” initial configuration with all the (LSP) bells and whistles.
All you would need to do, is adding ‘ocamllsp’ to line 340.
One of the Neovim core devs also created an accompanying video for the kickstart repo recently, which explains the reasoning behind some of the default settings: Effective Neovim: Instant IDE - YouTube
But I can second the recommendation for using the OCaml LSP, especially with Neovim.