Adds support for signature help trigger characters.

mibu138 · Mar 6, 2024 · 19670de · 19670de
1 parent eb4266c
commit 19670de
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Showing 3 changed files with 41 additions and 0 deletions.
diff --git a/autoload/lsc/capabilities.vim b/autoload/lsc/capabilities.vim
@@ -18,6 +18,14 @@ function! lsc#capabilities#normalize(capabilities) abort
       endif
     endif
   endif
+  if has_key(a:capabilities, 'signatureHelpProvider') &&
+      \ type(a:capabilities.signatureHelpProvider) != type(v:null)
+    let l:signature_help_provider = a:capabilities.signatureHelpProvider
+    if has_key(l:signature_help_provider, 'triggerCharacters')
+        let l:normalized.signaturehelp.triggerCharacters =
+           \ l:signature_help_provider['triggerCharacters']
+    endif
+  endif
   if has_key(a:capabilities, 'textDocumentSync')
     let l:text_document_sync = a:capabilities['textDocumentSync']
     let l:incremental = v:false
@@ -45,6 +53,7 @@ endfunction
 function! lsc#capabilities#defaults() abort
   return {
       \ 'completion': {'triggerCharacters': []},
+      \ 'signaturehelp': {'triggerCharacters': []},
       \ 'textDocumentSync': {
       \   'incremental': v:false,
       \   'sendDidSave': v:false,

diff --git a/autoload/lsc/signaturehelp.vim b/autoload/lsc/signaturehelp.vim
@@ -1,8 +1,37 @@
+function! lsc#signaturehelp#insertCharPre() abort
+  let s:next_char = v:char
+endfunction
+
 if !exists('s:initialized')
   let s:current_parameter = ''
+  let s:next_char = ''
   let s:initialized = v:true
 endif
 
+function! lsc#signaturehelp#textChanged() abort
+  if &paste | return | endif
+  if !g:lsc_enable_autocomplete | return | endif
+  " This may be <BS> or similar if not due to a character typed
+  if empty(s:next_char) | return | endif
+  call s:typedCharacter()
+  let s:next_char = ''
+endfunction
+
+function! s:typedCharacter() abort
+  if s:isTrigger(s:next_char)
+    call lsc#signaturehelp#getSignatureHelp()
+  endif
+endfunction
+
+function! s:isTrigger(char) abort
+  for l:server in lsc#server#current()
+    if index(l:server.capabilities.signaturehelp.triggerCharacters, a:char) >= 0
+      return v:true
+    endif
+  endfor
+  return v:false
+endfunction
+
 function! lsc#signaturehelp#getSignatureHelp() abort
   call lsc#file#flushChanges()
   let l:params = lsc#params#documentPosition()

diff --git a/plugin/lsc.vim b/plugin/lsc.vim
@@ -131,8 +131,11 @@ augroup LSC
       \ call <SID>IfEnabled('lsc#cursor#onChangesFlushed')
 
   autocmd TextChangedI * call <SID>IfEnabled('lsc#complete#textChanged')
+  autocmd TextChangedI * call <SID>IfEnabled('lsc#signaturehelp#textChanged')
   autocmd TextChangedP * call <SID>IfEnabled('lsc#complete#textChanged')
+  autocmd TextChangedP * call <SID>IfEnabled('lsc#signaturehelp#textChanged')
   autocmd InsertCharPre * call <SID>IfEnabled('lsc#complete#insertCharPre')
+  autocmd InsertCharPre * call <SID>IfEnabled('lsc#signaturehelp#insertCharPre')
 
   autocmd VimLeave * call lsc#server#exit()
   if exists('##ExitPre')