From 054aaa0808f5b77fa777369a3b3fda967ce1af3f Mon Sep 17 00:00:00 2001
From: Michael Campagnaro <mikecampo@gmail.com>
Date: Wed, 1 Dec 2021 13:57:38 -0500
Subject: [PATCH] Stop vim from creating ctags when the process is already
 running

---
 vimrc | 19 +++++++++++++------
 1 file changed, 13 insertions(+), 6 deletions(-)

diff --git a/vimrc b/vimrc
index ef6e35b..77048a4 100644
--- a/vimrc
+++ b/vimrc
@@ -118,6 +118,10 @@ let g:campo_custom_search_args = ""
 " in this comment string)
 " let g:campo_custom_ctags_args = \"--exclude=3rd_party"
 let g:campo_custom_ctags_args = ""
+
+" Default files and directories that ctags should ignore.
+let s:default_ctags_exclude_args = "--exclude=.git --exclude=*.md --exclude=*.txt --exclude=*.config --exclude=*.css --exclude=*.html --exclude=*.htm --exclude=*.json --exclude=node_modules --exclude=.cache"
+
 " ---------------------------------------------------------------------------
 
 "################################################################
@@ -464,7 +468,7 @@ augroup campoCmds
 
     " Automatically wrap at N characters.
     autocmd FileType gitcommit setlocal colorcolumn=72
-    autocmd BufRead,BufNewFile *.{md,txt,plan} execute "setlocal textwidth=" .s:max_line_length
+    autocmd BufRead,BufNewFile *.{md,txt,plan} exec "setlocal textwidth=" .s:max_line_length
 
     " Spell checking.
     autocmd FileType gitcommit,markdown,text setlocal spell
@@ -493,11 +497,14 @@ augroup campoCmds
         " The ampersand at the end is to make this run in the background. I had to
         " group the commands in parens to make the chained commands run in the
         " background.
-        " @improve: don't run a bunch of ctags for the same project when mass
-        " saving files. They all try to write and move newtags which tends to
-        " lock up vim and/or spew errors.
-        let l:ctags_cmd = "!(ctags --c-types=+l --c++-types=+l --exclude=*.md --exclude=*.txt --exclude=*.config --exclude=*.css --exclude=*.js --exclude=*.html --exclude=*.htm --exclude=*.json --exclude=node_modules --exclude=.git --exclude=.cache " . g:campo_custom_ctags_args . " --recurse=yes -o newtags; mv newtags tags) &"
-        exec l:ctags_cmd | redraw!
+        let l:lock_file = "ctags.lock"
+        if !filereadable(l:lock_file) && !filereadable("newtags")
+            " Will include local variables for C-like languages.
+            let l:ctags_cmd = "!(touch ".l:lock_file."; ctags --c-types=+l --c++-types=+l ".s:default_ctags_exclude_args." ". g:campo_custom_ctags_args." --recurse=yes -o newtags; mv newtags tags; rm ".l:lock_file.") &"
+            silent! exec l:ctags_cmd | redraw!
+        else
+            PrintError "ctags already running (found ".l:lock_file.")"
+        endif
     endfun
 
     " Generate ctags on save.