fix(fzf_live): with string shell commands

Author: ibhagwan

lua/fzf-lua/core.lua

@@ -176,6 +176,15 @@ M.fzf_live = function(contents, opts)
   -- convert "reload" actions to fzf's `reload` binds
   -- convert "exec_silent" actions to fzf's `execute-silent` binds
   shell.clear_protected()
+  if type(contents) == "string" then
+    -- Signal to stringify_mt we are relocating <query>
+    -- Signal to preprocess we are looking to replace {argvz}
+    -- Append query placeholder if not found in command
+    opts.argv_expr = opts.multiprocess
+    if not contents:match(M.fzf_query_placeholder) then
+      contents = ("%s %s"):format(contents, M.fzf_query_placeholder)
+    end
+  end
   opts.fn_reload = shell.stringify(contents, opts, nil, true)
   local fzf_field_index = M.fzf_field_index(opts)
   local cmd = M.expand_query(opts.fn_reload, fzf_field_index)

lua/fzf-lua/providers/grep.lua

@@ -294,9 +294,6 @@ M.live_grep = function(opts)
     opts.multiprocess = opts.multiprocess and 1
   end
 
-  -- signal to preprocess we are looking to replace {argvz}
-  opts.argv_expr = opts.multiprocess
-
   -- this will be replaced by the appropriate fzf
   -- FIELD INDEX EXPRESSION by 'fzf_exec'
   local cmd = get_grep_cmd(opts, core.fzf_query_placeholder, 2)

lua/fzf-lua/shell.lua

@@ -215,6 +215,10 @@ M.stringify_mt = function(cmd, opts)
       -- NOTE: since we cannot guarantee the positional index
       -- of arguments (#291), we use the last argument instead
       opts.cmd = opts.cmd:gsub(FzfLua.core.fzf_query_placeholder, "{argvz}")
+      -- Must have preprocess to relocate {argvz}
+      opts.fn_preprocess = opts.fn_preprocess == nil
+          and [[return require("fzf-lua.make_entry").preprocess]]
+          or opts.fn_preprocess
     end
     local spawn_cmd = libuv.wrap_spawn_stdio(
       serialize(filter_opts(opts)),