Docs: Port awful.rules into the new doc format.

This converts the old documentation style into the new one to use
markdown instead of HTML in bigger doc blocks. Also, we can use block
comments, which means that writting documentation (and indenting code
blocks) easier.

Signed-off-by: Ignas Anikevicius (gns_ank) <anikevicius@gmail.com>

lib/awful/rules.lua.in

@@ -1,4 +1,6 @@
 ---------------------------------------------------------------------------
+-- Apply rules to clients at startup.
+--
 -- @author Julien Danjou <julien@danjou.info>
 -- @copyright 2009 Julien Danjou
 -- @release @AWESOME_VERSION@
@@ -13,102 +15,82 @@ local pairs = pairs
 local aclient = require("awful.client")
 local atag = require("awful.tag")
 
---- Apply rules to clients at startup.
--- awful.rules
 local rules = {}
 
---- This is the global rules table.
--- <p>You should fill this table with your rule and properties to apply.
--- For example, if you want to set xterm maximized at startup, you can add:
--- <br/>
--- <code>
--- { rule = { class = "xterm" },
---   properties = { maximized_vertical = true, maximized_horizontal = true } }
--- </code>
--- </p>
--- <p>If you want to set mplayer floating at startup, you can add:
--- <br/>
--- <code>
--- { rule = { name = "MPlayer" },
---   properties = { floating = true } }
--- </code>
--- </p>
--- <p>If you want to put Firefox on a specific tag at startup, you
--- can add:
--- <br/>
--- <code>
--- { rule = { instance = "firefox" },
---   properties = { tag = mytagobject } }
--- </code>
--- </p>
--- <p>If you want to put Emacs on a specific tag at startup, and
--- immediately switch to that tag you can add:
--- <br/>
--- <code>
--- { rule = { class = "Emacs" },
---   properties = { tag = mytagobject, switchtotag = true } }
--- </code>
--- </p>
--- <p>If you want to apply a custom callback to execute when a rule matched,
--- for example to pause playing music from mpd when you start dosbox, you
--- can add:
--- <br/>
--- <code>
--- { rule = { class = "dosbox" },
---   callback = function(c)
---      awful.util.spawn('mpc pause')
---   end }
--- </code>
--- </p>
--- <p>Note that all "rule" entries need to match. If any of the entry does not
--- match, the rule won't be applied.</p>
--- <p>If a client matches multiple rules, their applied in the order they are
--- put in this global rules table. If the value of a rule is a string, then the
--- match function is used to determine if the client matches the rule.</p>
--- <p>If the value of a property is a function, that function gets called and
--- function's return value is used for the property.</p>
---
--- <p> To match multiple clients to a rule one need to use slightly different 
--- syntax:
--- <br/>
--- <code>
--- { rule_any = { class = { "MPlayer", "Nitrogen" }, instance = { "xterm" } },
---   properties = { floating = true } }
--- </code>
--- </p>
---
--- <p> To match multiple clients with an exception one can couple 'except' or
--- 'except_any' with the rules:
--- <br/>
--- <code>
--- { rule = { class = "Firefox" },
---   except = { instance = "Navigator" },
---   properties = {floating = true},
--- },
--- </code>
--- <br/>
--- <code>
--- { rule_any = { class = { "Pidgin", "Xchat" } },
---   except_any = { role = { "conversation" } },
---   properties = { tag = tags[1][1] }
--- }
--- <br/>
--- <code>
--- { rule = {},
---   except_any = { class = { "Firefox", "Vim" } },
---   properties = { floating = true }
--- }
--- </code>
--- </p>
---
--- @class table
--- @name rules
+--[[--
+This is the global rules table.
+
+You should fill this table with your rule and properties to apply.
+For example, if you want to set xterm maximized at startup, you can add:
+
+    { rule = { class = "xterm" },
+      properties = { maximized_vertical = true, maximized_horizontal = true } }
+
+If you want to set mplayer floating at startup, you can add:
+
+    { rule = { name = "MPlayer" },
+      properties = { floating = true } }
+
+If you want to put Firefox on a specific tag at startup, you can add:
+
+    { rule = { instance = "firefox" },
+      properties = { tag = mytagobject } }
+
+If you want to put Emacs on a specific tag at startup, and immediately switch
+to that tag you can add:
+
+    { rule = { class = "Emacs" },
+      properties = { tag = mytagobject, switchtotag = true } }
+
+If you want to apply a custom callback to execute when a rule matched,
+for example to pause playing music from mpd when you start dosbox, you
+can add:
+
+    { rule = { class = "dosbox" },
+      callback = function(c)
+         awful.util.spawn('mpc pause')
+      end }
+
+Note that all "rule" entries need to match. If any of the entry does not
+match, the rule won't be applied.
+
+If a client matches multiple rules, their applied in the order they are
+put in this global rules table. If the value of a rule is a string, then the
+match function is used to determine if the client matches the rule.
+
+If the value of a property is a function, that function gets called and
+function's return value is used for the property.
+
+To match multiple clients to a rule one need to use slightly different
+syntax:
+
+    { rule_any = { class = { "MPlayer", "Nitrogen" }, instance = { "xterm" } },
+      properties = { floating = true } }
+
+To match multiple clients with an exception one can couple `rules.except` or
+`rules.except_any` with the rules:
+
+    { rule = { class = "Firefox" },
+      except = { instance = "Navigator" },
+      properties = {floating = true},
+    },
+
+    { rule_any = { class = { "Pidgin", "Xchat" } },
+      except_any = { role = { "conversation" } },
+      properties = { tag = tags[1][1] }
+    }
+
+    { rule = {},
+      except_any = { class = { "Firefox", "Vim" } },
+      properties = { floating = true }
+    }
+]]--
 rules.rules = {}
 
 --- Check if a client matches a rule.
 -- @client c The client.
 -- @tab rule The rule to check.
--- @return True if it matches, false otherwise.
+-- @treturn bool True if it matches, false otherwise.
 function rules.match(c, rule)
     if not rule then return false end
     for field, value in pairs(rule) do
@@ -130,7 +112,7 @@ end
 --- Check if a client matches any part of a rule.
 -- @client c The client.
 -- @tab rule The rule to check.
--- @return True if at least one rule is matched, false otherwise.
+-- @treturn bool True if at least one rule is matched, false otherwise.
 function rules.match_any(c, rule)
     if not rule then return false end
     for field, values in pairs(rule) do
@@ -167,7 +149,7 @@ end
 -- @client c The client.
 -- @tab rules The rules to check. List with "rule", "rule_any", "except" and
 --            "except_any" keys.
--- @treturn boolean True if at least one rule is matched, false otherwise.
+-- @treturn bool True if at least one rule is matched, false otherwise.
 function rules.does_match(c, rules)
     local result = rules.matching_rules(c, rules)
     return #result == 0 and false or result