Allow specifying max width for floating windows (#1336)

Author: yuilib

autoload/lsp/internal/completion/documentation.vim

@@ -109,8 +109,15 @@ function! s:show_floating_window(event, managed_user_data) abort
     call setbufline(l:doc_win.get_bufnr(), 1, lsp#utils#_split_by_eol(join(l:contents, "\n\n")))
 
     " Calculate layout.
+    if g:lsp_float_max_width >= 1
+        let l:maxwidth = g:lsp_float_max_width
+    elseif g:lsp_float_max_width == 0
+        let l:maxwidth = &columns
+    else
+        let l:maxwidth = float2nr(&columns * 0.4)
+    endif
     let l:size = l:doc_win.get_size({
-    \     'maxwidth': float2nr(&columns * 0.4),
+    \     'maxwidth': l:maxwidth,
     \     'maxheight': float2nr(&lines * 0.4),
     \ })
     let l:margin_right = &columns - 1 - (float2nr(a:event.col) + float2nr(a:event.width) + 1 + (a:event.scrollbar ? 1 : 0))

autoload/lsp/internal/diagnostics/float.vim

@@ -46,8 +46,15 @@ function! s:show_float(diagnostic) abort
         call setbufline(l:doc_win.get_bufnr(), 1, lsp#utils#_split_by_eol(a:diagnostic['message']))
 
         " Compute size. 
+        if g:lsp_float_max_width >= 1
+            let l:maxwidth = g:lsp_float_max_width
+        elseif g:lsp_float_max_width == 0
+            let l:maxwidth = &columns
+        else
+            let l:maxwidth = float2nr(&columns * 0.4)
+        endif
         let l:size = l:doc_win.get_size({
-        \   'maxwidth': float2nr(&columns * 0.4),
+        \   'maxwidth': l:maxwidth,
         \   'maxheight': float2nr(&lines * 0.4),
         \ })
 

autoload/lsp/internal/document_hover/under_cursor.vim

@@ -142,8 +142,15 @@ function! s:show_floating_window(server_name, request, response) abort
     call setbufline(l:doc_win.get_bufnr(), 1, lsp#utils#_split_by_eol(join(l:contents, "\n\n")))
 
     " Calculate layout.
+    if g:lsp_float_max_width >= 1
+        let l:maxwidth = g:lsp_float_max_width
+    elseif g:lsp_float_max_width == 0
+        let l:maxwidth = &columns
+    else
+        let l:maxwidth = float2nr(&columns * 0.4)
+    endif
     let l:size = l:doc_win.get_size({
-        \   'maxwidth': float2nr(&columns * 0.4),
+        \   'maxwidth': l:maxwidth,
         \   'maxheight': float2nr(&lines * 0.4),
         \ })
     let l:pos = s:compute_position(l:size)

doc/vim-lsp.txt

@@ -72,6 +72,7 @@ CONTENTS                                                  *vim-lsp-contents*
       g:lsp_preview_max_width               |g:lsp_preview_max_width|
       g:lsp_preview_max_height              |g:lsp_preview_max_height|
       g:lsp_preview_fixup_conceal           |g:lsp_preview_fixup_conceal|
+      g:lsp_float_max_width                 |g:lsp_preview_max_width|
       g:lsp_signature_help_enabled          |g:lsp_signature_help_enabled|
       g:lsp_fold_enabled                    |g:lsp_fold_enabled|
       g:lsp_hover_conceal                   |g:lsp_hover_conceal|
@@ -920,6 +921,17 @@ g:lsp_preview_fixup_conceal                   *g:lsp_preview_fixup_conceal*
     That's useful in vim. vim's popup doesn't shrink correctly if the
     buffer content uses conceals.
 
+g:lsp_float_max_width                           *g:lsp_preview_max_width*
+    Type: |Number|
+    Default: `-1`
+
+    If positive, determines the maximum width of the float windows in
+    characters. Lines longer than `g:lsp_float_max_width` will be wrapped to fit
+    in the float window.
+    If set to 0, float windows can stretch to the width of the screen.
+    Otherwise, the maximum width of the floating windows is set to 40% of the
+    screen.
+
 g:lsp_signature_help_enabled                *g:lsp_signature_help_enabled*
     Type: |Number|
     Default: `1`

plugin/lsp.vim

@@ -58,6 +58,7 @@ let g:lsp_preview_fixup_conceal = get(g:, 'lsp_preview_fixup_conceal', 0)
 let g:lsp_peek_alignment = get(g:, 'lsp_peek_alignment', 'center')
 let g:lsp_preview_max_width = get(g:, 'lsp_preview_max_width', -1)
 let g:lsp_preview_max_height = get(g:, 'lsp_preview_max_height', -1)
+let g:lsp_float_max_width = get(g:, 'lsp_float_max_width', -1)
 let g:lsp_signature_help_enabled = get(g:, 'lsp_signature_help_enabled', 1)
 let g:lsp_signature_help_delay = get(g:, 'lsp_signature_help_delay', 200)
 let g:lsp_show_workspace_edits = get(g:, 'lsp_show_workspace_edits', 0)