Support .nrepl-port outside of Leiningen

plugin/fireplace.vim

@@ -134,6 +134,7 @@ let s:repl = {"requires": {}}
 if !exists('s:repls')
   let s:repls = []
   let s:repl_paths = {}
+  let s:repl_portfiles = {}
 endif
 
 function! s:repl.user_ns() abort
@@ -236,6 +237,34 @@ endfunction
 function! s:unregister_connection(conn) abort
   call filter(s:repl_paths, 'v:val.connection.transport isnot# a:conn.transport')
   call filter(s:repls, 'v:val.connection.transport isnot# a:conn.transport')
+  call filter(s:repl_portfiles, 'v:val.connection.transport isnot# a:conn.transport')
+endfunction
+
+function! s:register_portfile(portfile, ...) abort
+  let old = get(s:repl_portfiles, a:portfile, {})
+  if has_key(old, 'time') && getftime(a:portfile) !=# old.time
+    call s:unregister_connection(old.connection)
+    let old = {}
+  endif
+  if empty(old) && getfsize(a:portfile) > 0
+    let port = matchstr(readfile(a:portfile, 'b', 1)[0], '\d\+')
+    let s:repl_portfiles[a:portfile] = {'time': getftime(a:portfile)}
+    try
+      let conn = nrepl#fireplace_connection#open(port)
+      let s:repl_portfiles[a:portfile].connection = conn
+      call s:register_connection(conn, a:0 ? a:1 : '')
+      return conn
+    catch /^nREPL Connection Error:/
+      if &verbose
+        echohl WarningMSG
+        echomsg v:exception
+        echohl None
+      endif
+      return {}
+    endtry
+  else
+    return get(old, 'connection', {})
+  endif
 endfunction
 
 " }}}1
@@ -437,7 +466,18 @@ function! fireplace#path(...) abort
 endfunction
 
 function! fireplace#platform(...) abort
+  for [k, v] in items(s:repl_portfiles)
+    if getftime(k) != v.time
+      call s:unregister_connection(v.connection)
+    endif
+  endfor
+
+  let portfile = findfile('.nrepl-port', '.;/')
+  if !empty(portfile)
+    call s:register_portfile(portfile, fnamemodify(portfile, ':h'))
+  endif
   silent doautocmd User FireplacePreConnect
+
   let buf = a:0 ? a:1 : s:buf()
   let root = simplify(fnamemodify(bufname(buf), ':p:s?[\/]$??'))
   let previous = ""
@@ -1320,13 +1360,13 @@ if !exists('s:leiningen_repls')
   let s:leiningen_paths = {}
 endif
 
-function! s:portfile() abort
+function! s:leiningen_portfile() abort
   if !exists('b:leiningen_root')
     return ''
   endif
 
   let root = b:leiningen_root
-  let portfiles = [root.'/target/repl-port', root.'/target/repl/repl-port', root.'/.nrepl-port']
+  let portfiles = [root.'/.nrepl-port', root.'/target/repl-port', root.'/target/repl/repl-port']
 
   for f in portfiles
     if filereadable(f)
@@ -1336,7 +1376,6 @@ function! s:portfile() abort
   return ''
 endfunction
 
-
 function! s:leiningen_connect() abort
   for [k, v] in items(s:leiningen_repls)
     if getfsize(v.file) <= 0
@@ -1345,26 +1384,13 @@ function! s:leiningen_connect() abort
     endif
   endfor
 
-  let portfile = s:portfile()
+  let portfile = s:leiningen_portfile()
   if empty(portfile)
     return
   endif
-
+  let conn = s:register_portfile(portfile, b:leiningen_root)
-  if getfsize(portfile) > 0 && getftime(portfile) !=# get(get(s:leiningen_repls, b:leiningen_root, {}), 'time', -1)
+  if has_key(conn, 'path')
-    let port = matchstr(readfile(portfile, 'b', 1)[0], '\d\+')
-    let s:leiningen_repls[b:leiningen_root] = {'time': getftime(portfile), 'file': portfile}
-    try
-      let conn = nrepl#fireplace_connection#open(port)
-      let s:leiningen_repls[b:leiningen_root].connection = conn
-      call s:register_connection(conn, b:leiningen_root)
     let s:leiningen_paths[b:leiningen_root] = conn.path()
-    catch /^nREPL Connection Error:/
-      if &verbose
-        echohl WarningMSG
-        echomsg v:exception
-        echohl None
-      endif
-    endtry
   endif
 endfunction