[vim] Consistent exit status handling

plugin/fzf.vim

@@ -222,6 +222,19 @@ endfunction
 unlet! s:launcher
 let s:launcher = function('s:xterm_launcher')
 
+function! s:exit_handler(code, command, ...)
+  if a:code == 130
+    return 0
+  elseif a:code > 1
+    call s:error('Error running ' . a:command)
+    if !empty(a:000)
+      sleep
+    endif
+    return 0
+  endif
+  return 1
+endfunction
+
 function! s:execute(dict, command, temps)
   call s:pushd(a:dict)
   silent! !clear 2> /dev/null
@@ -235,14 +248,7 @@ function! s:execute(dict, command, temps)
   endif
   execute 'silent !'.command
   redraw!
-  if v:shell_error == 0 || v:shell_error == 1
+  return s:exit_handler(v:shell_error, command) ? s:callback(a:dict, a:temps) : []
-    return s:callback(a:dict, a:temps)
-    " Do not print error message on exit status 130 (interrupt)
-  elseif v:shell_error == 130
-    return []
-  else
-    call s:error('Error running ' . command)
-  endif
 endfunction
 
 function! s:execute_tmux(dict, command, temps)
@@ -254,11 +260,7 @@ function! s:execute_tmux(dict, command, temps)
 
   call system(command)
   redraw!
-  if v:shell_error == 2
+  return s:exit_handler(v:shell_error, command) ? s:callback(a:dict, a:temps) : []
-    call s:error('Error running ' . command)
-    return []
-  endif
-  return s:callback(a:dict, a:temps)
 endfunction
 
 function! s:calc_size(max, val, dict)
@@ -334,9 +336,7 @@ function! s:execute_term(dict, command, temps)
       endif
     endif
 
-    if a:code == 2
+    if !s:exit_handler(a:code, s:command, 1)
-      call s:error('Error running ' . s:command)
-      sleep
       return
     endif