1 files changed, 40 insertions, 0 deletions
diff --git a/src/luarocks/cmd/which.lua b/src/luarocks/cmd/which.lua
new file mode 100644
index 0000000..f50a43c
--- /dev/null
+++ b/src/luarocks/cmd/which.lua
@@ -0,0 +1,40 @@
+
+--- @module luarocks.which_cmd
+-- Driver for the `luarocks which` command.
+local which_cmd = {}
+
+local loader = require("luarocks.loader")
+local cfg = require("luarocks.core.cfg")
+local util = require("luarocks.util")
+
+function which_cmd.add_to_parser(parser)
+   local cmd = parser:command("which", 'Given a module name like "foo.bar", '..
+      "output which file would be loaded to resolve that module by "..
+      'luarocks.loader, like "/usr/local/lua/'..cfg.lua_version..'/foo/bar.lua".',
+      util.see_also())
+      :summary("Tell which file corresponds to a given module name.")
+
+   cmd:argument("modname", "Module name.")
+end
+
+--- Driver function for "which" command.
+-- @return boolean This function terminates the interpreter.
+function which_cmd.command(args)
+   local pathname, rock_name, rock_version, where = loader.which(args.modname, "lp")
+
+   if pathname then
+      util.printout(pathname)
+      if where == "l" then
+         util.printout("(provided by " .. tostring(rock_name) .. " " .. tostring(rock_version) .. ")")
+      else
+         local key = rock_name
+         util.printout("(found directly via package." .. key.. " -- not installed as a rock?)")
+      end
+      return true
+   end
+
+   return nil, "Module '" .. args.modname .. "' not found."
+end
+
+return which_cmd
+