[ADD] Example of what could be done to display a category content

categ/display.lua

@@ -0,0 +1,58 @@
+#!/usr/bin/env lua
+
+-- display.lua
+-- Display content of a file and attempt to match some specific words
+-- author: Olivier DOSSMANN (olivier+lua@dossmann.net)
+
+--[[ requirement ]]--
+require 'lfs' -- apt-get install liblua5.1-filesystem0 || luarocks install luafilesystem
+
+function process(filepath)
+  -- parse given file
+  for line in io.lines(filepath) do
+    -- check if this line is a comment ("# my comment"), a category ("[[My category]]Its description") or an element ("Title##Description##URL##Image")
+    is_comment = string.find(line, '^#(.*)')
+    is_title = string.find(line, '%[%[(.*)%]%](.*)')
+    is_element = string.find(line, '(.*)##(.*)##(.*)##(.*)')
+    if is_comment then
+      -- do nothing because it's a comment
+    elseif is_title then
+      title = ''
+      for t in string.gmatch(line, '%[%[(.*)%]%].*') do title = title .. t end
+      description =''
+      for d in string.gmatch(line, '%[%[.*%]%](.*)') do description = description .. d end
+      print("TITLE: " .. '\n\t' .. title .. '\n\t' .. description)
+    elseif is_element then
+      title = ''
+      description = ''
+      url = ''
+      img = ''
+      for t in string.gmatch(line, '(.*)##.*##.*##.*') do title = title .. t end
+      for d in string.gmatch(line, '.*##(.*)##.*##.*') do description = description .. d end
+      for u in string.gmatch(line, '.*##.*##(.*)##.*') do url = url .. u end
+      for i in string.gmatch(line, '.*##.*##.*##(.*)') do img = img .. i end
+      print("ELEMENT: " .. '\n\t' .. title .. '\n\t' .. description .. '\n\t' .. url .. '\n\t' .. img)
+    end
+  end
+end
+
+function help()
+  print('Usage: ' .. arg[0] .. ' FILE...')
+end
+
+if arg and table.getn(arg) > 0 then
+  for i, file in pairs(arg) do
+    if i > 0 then
+      attr = lfs.attributes(file)
+      if attr and attr.mode == 'file' then
+        process(file)
+      else
+        print('INFO: ' .. file .. ' is not a file or doesn\'t exists.')
+      end
+    end
+  end
+else
+  print('WARNING: No argument given.')
+  help()
+  os.exit(1)
+end