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Add g:tagbar_jump_lazy_scroll option. (#705)

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* Add g:tagbar_jump_lazy_scroll option.

When this option is on, a jump to a tag will only cause the
window to scroll if the tag line is not already visible on
the window.  If it is visible, the cursor will simply move
to that line without scrolling the window.  If the tagline
is not visible then the window will be scrolled as in current
behavior (according to the g:tagbar_jump_offset option).

Fixes #703

* Factor our new logic into a function.

* Add jump target line to doc.
This commit is contained in:
David P. Sicilia
2020-11-10 17:07:57 -05:00
committed by GitHub
parent 10a4a9bc38
commit 6eadc15054
3 changed files with 46 additions and 15 deletions
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50
autoload/tagbar.vim
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@@ -2269,6 +2269,15 @@ function! s:HighlightTag(openfolds, ...) abort
endtry
endfunction
" Is the given line number already visible in the window without
" any scrolling?
function! s:IsLineVisible(line) abort
let topline = line('w0')
let bottomline = line('w$')
let alreadyvisible = (a:line >= topline) && (a:line <= bottomline)
return alreadyvisible
endfunction
" s:JumpToTag() {{{2
function! s:JumpToTag(stay_in_tagbar) abort
let taginfo = s:GetTagInfo(line('.'), 1)
@@ -2286,6 +2295,13 @@ function! s:JumpToTag(stay_in_tagbar) abort
" Mark current position so it can be jumped back to
mark '
" Check if the tag is already visible in the window. We must do this
" before jumping to the line.
let noscroll = 0
if g:tagbar_jump_lazy_scroll != 0
let noscroll = s:IsLineVisible(taginfo.fields.line)
endif
" Jump to the line where the tag is defined. Don't use the search pattern
" since it doesn't take the scope into account and thus can fail if tags
" with the same name are defined in different scopes (e.g. classes)
@@ -2320,22 +2336,26 @@ function! s:JumpToTag(stay_in_tagbar) abort
let taginfo.fileinfo.fline[curline] = taginfo
endif
" Center the tag in the window and jump to the correct column if
" available, otherwise try to find it in the line
normal! z.
" If configured, adjust the jump_offset and center the window on that
" line. Then fall-through adjust the cursor() position below that
if g:tagbar_jump_offset != 0 && g:tagbar_jump_offset < curline
if g:tagbar_jump_offset > winheight(0) / 2
let jump_offset = winheight(0) / 2
elseif g:tagbar_jump_offset < -winheight(0) / 2
let jump_offset = -winheight(0) / 2
else
let jump_offset = g:tagbar_jump_offset
endif
execute curline+jump_offset
if noscroll
" Do not scroll.
else
" Center the tag in the window and jump to the correct column if
" available, otherwise try to find it in the line
normal! z.
" If configured, adjust the jump_offset and center the window on that
" line. Then fall-through adjust the cursor() position below that
if g:tagbar_jump_offset != 0 && g:tagbar_jump_offset < curline
if g:tagbar_jump_offset > winheight(0) / 2
let jump_offset = winheight(0) / 2
elseif g:tagbar_jump_offset < -winheight(0) / 2
let jump_offset = -winheight(0) / 2
else
let jump_offset = g:tagbar_jump_offset
endif
execute curline+jump_offset
normal! z.
endif
endif
if taginfo.fields.column > 0