From d50dd19f6f93becacf30419695e21200dc210a34 Mon Sep 17 00:00:00 2001
From: Jesse Luehrs <doy@tozt.net>
Date: Thu, 8 Mar 2018 02:40:01 -0500
Subject: initial implementation

---
 plugin/history-sync.vim | 77 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 plugin/history-sync.vim

(limited to 'plugin/history-sync.vim')

diff --git a/plugin/history-sync.vim b/plugin/history-sync.vim
new file mode 100644
index 0000000..3f32333
--- /dev/null
+++ b/plugin/history-sync.vim
@@ -0,0 +1,77 @@
+if $SHELL !~# 'zsh' || !exists('g:_zsh_hist_fname')
+    finish
+endif
+
+let s:initial_files = {}
+
+augroup zshhistory
+    autocmd!
+    autocmd VimEnter * call <SID>init_zsh_hist()
+    autocmd BufNewFile,BufRead * call <SID>zsh_hist_append()
+    autocmd BufDelete * call <SID>remove_initial_file(expand("<afile>"))
+    autocmd VimLeave * call <SID>reorder_zsh_hist()
+augroup END
+
+function! s:remove_initial_file (file)
+    if has_key(s:initial_files, a:file)
+        unlet s:initial_files[a:file]
+    endif
+endfunction
+
+function! s:get_buffer_list_text ()
+    redir => l:output
+    ls!
+    redir END
+    return l:output
+endfunction
+
+function! s:get_buffer_list ()
+    silent let l:output = <SID>get_buffer_list_text()
+    let l:buffer_list = []
+    for l:buffer_desc in split(l:output, "\n")
+        let l:name = bufname(str2nr(l:buffer_desc))
+        if l:name != ""
+            call add(l:buffer_list, l:name)
+        endif
+    endfor
+    return l:buffer_list
+endfunction
+
+function! s:init_zsh_hist ()
+    for l:fname in <SID>get_buffer_list()
+        if strlen(l:fname) > 0
+            let s:initial_files[l:fname] = 1
+            call histadd(":", "e " . l:fname)
+        endif
+    endfor
+    call delete(g:_zsh_hist_fname)
+endfunction
+
+function! s:zsh_hist_append ()
+    let l:to_append = expand("%:~:.")
+    " XXX these set buftype too late to be caught by this...
+    " this is broken, but not sure what a better fix is
+    if &buftype == '' && l:to_append !~# '^\(__Gundo\|Startify\|\[denite\]\)'
+        if !has_key(s:initial_files, l:to_append)
+            if filereadable(g:_zsh_hist_fname)
+                let l:hist = readfile(g:_zsh_hist_fname)
+            else
+                let l:hist = []
+            endif
+            call add(l:hist, l:to_append)
+            call writefile(l:hist, g:_zsh_hist_fname)
+        endif
+    endif
+endfunction
+
+function! s:reorder_zsh_hist ()
+    let l:current_file = expand("%:~:.")
+    if filereadable(g:_zsh_hist_fname)
+        let l:hist = readfile(g:_zsh_hist_fname)
+        if !has_key(s:initial_files, l:current_file)
+            call filter(l:hist, 'v:val != l:current_file')
+        endif
+        call add(l:hist, l:current_file)
+        call writefile(l:hist, g:_zsh_hist_fname)
+    endif
+endfunction
-- 
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