Undefined variable: b:traverser

[char101]

Hi,

I frequently encounter this errors:

Error detected while processing function pear_tree#insert_mode#OnInsertCharPre[1]..<SNR>201_CorrectTraverser:
line    2:
E121: Undefined variable: b:traverser
Error detected while processing function pear_tree#insert_mode#OnInsertCharPre[1]..<SNR>201_CorrectTraverser:
line    2:
E121: Undefined variable: b:traverser
Error detected while processing function pear_tree#insert_mode#OnInsertCharPre[1]..<SNR>201_CorrectTraverser:
line    2:
E121: Undefined variable: b:traverser
Error detected while processing function pear_tree#insert_mode#OnInsertCharPre[1]..<SNR>201_CorrectTraverser:
line    2:
E121: Undefined variable: b:traverser
Error detected while processing function pear_tree#insert_mode#OnInsertCharPre[1]..<SNR>201_CorrectTraverser:
line    2:
E121: Undefined variable: b:traverser

Unfortunately I cannot consistently reproduce this error. It seems to me that the variable creation is delayed, because if I exit and reenter INSERT mode, the variable b:traverser is defined.

[tmsvg]

The b:traverser variable is defined as soon as insert mode is first entered, so it's not clear to me how you would be getting this error, since OnInsertCharPre() should only be called after you enter insert mode. Maybe something in your config is preventing the InsertEnter autocmd from triggering (see :noautocmd or :eventignore).

This doesn't really sound like a Pear Tree bug to me, but you could try updating to the latest version and see if you still experience this issue.

[char101]

I don't experience the error again after adding these lines. It doesn't always happens and probably happens after switching buffers so most likely a problem of concurrent execution.

diff --git a/autoload/pear_tree/insert_mode.vim b/autoload/pear_tree/insert_mode.vim
index 8a53e08..75a2ce2 100644
--- a/autoload/pear_tree/insert_mode.vim
+++ b/autoload/pear_tree/insert_mode.vim
@@ -36,6 +36,7 @@ endfunction


 function! s:CorrectTraverser() abort
+    call pear_tree#insert_mode#OnInsertEnter()
     if s:lost_track
         call b:traverser.Reset()
         let s:traverser_start_pos = b:traverser.TraverseBuffer([1, 0], [line('.'), col('.') - 1])
@@ -61,6 +62,7 @@ endfunction


 function! pear_tree#insert_mode#OnCursorMovedI() abort
+    call pear_tree#insert_mode#OnInsertEnter()
     let l:new_line = line('.')
     let l:new_col = col('.')
     if l:new_line != s:current_line || l:new_col < s:current_column