Bump penlight from 1.7.0 to 1.31.1

This commit also removes filesystem.lua as the issue with dir.dirtree
has been fixed in penlight v1.8.0

lunarmodules/Penlight#329

Dockerfile

@@ -52,7 +52,7 @@ RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/man
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/3scale/lua-resty-env-0.4.0-1.src.rock
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/3scale/liquid-0.2.0-2.src.rock
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/tieske/date-2.2-2.src.rock
-RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/tieske/penlight-1.7.0-1.src.rock
+RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/tieske/penlight-1.13.1-1.src.rock
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/mpeterv/argparse-0.6.0-1.src.rock
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/3scale/lua-resty-execvp-0.1.1-1.src.rock
 RUN luarocks install --deps-mode=none --tree /usr/local https://luarocks.org/manifests/3scale/luafilesystem-ffi-0.2.0-1.src.rock

gateway/src/apicast/cli/command/generate.lua

@@ -1,6 +1,5 @@
 local setmetatable = setmetatable
 
-local filesystem = require('apicast.cli.filesystem')
 local pl = require'pl.import_into'()
 local Template = require('apicast.cli.template')
 
@@ -30,7 +29,7 @@ function _M.copy(source, destination, env, force)
 
   local template = Template:new(env, source, true)
 
-  for filename in filesystem(source) do
+  for filename in pl.dir.dirtree(source) do
     local path = template:interpret(pl.path.relpath(filename, source))
 
     local fullpath = pl.path.join(destination, path)

gateway/src/apicast/cli/template.lua

@@ -8,7 +8,6 @@ local ipairs = ipairs
 local sub = string.sub
 local len = string.len
 local pack = table.pack
-local fs = require('apicast.cli.filesystem')
 local pl = { dir = require('pl.dir'), path = require('pl.path'), file = require('pl.file') }
 local Liquid = require 'liquid'
 local resty_env = require('resty.env')
@@ -84,7 +83,7 @@ local function dirtree(dir, cache)
     return pairs(cached)
   else
     cache[dir] = {}
-    return fs(dir)
+    return pl.dir.dirtree(dir)
   end
 end