It's one function that, when you press it will check your combo points. If you have less than 5, it will make sure you are using weaponset1 then cast SkillOneRank. If you have 5 combo points, it will change your weapons to weaponset2 and then cast SkillTwoRank.

Basically this addon adds a function to the scripting library that you trigger via a macro. Simply create a macro and use the following code:
/script UUI_RogueWeaponSwap();

The modification of this addon is done via slash commands that all use the following syntax:

/script <variable> = "<data string>";

<variable>'s are WeaponSetOneMainHand, WeaponSetOneOffHand, WeaponSetTwoMainHand, WeaponSetTwoOffHand, SkillOneRank, SkillTwoRank
Note that <data string> is case sensitive.

EXAMPLE (an example of what you could type in-game to make this addon work):
/script WeaponSetOneMainHand = "Sword of Omen";
/script WeaponSetOneOffHand = "Distracting Dagger";
/script WeaponSetTwoMainHand = "Sword of Serenity";
/script WeaponSetTwoOffHand = "12 Pound Catfish";
/script SkillOneRank = "Sinister Strike(Rank 8)";
/script SkillTwoRank = "Eviscerate(Rank 8)";

Note #1: There will be no prompt should this be done correctly OR incorrectly (unless it's a syntax error).
Note #2: You HAVE TO set up your weapon sets and eviscerate/sinister strike ranks before hand, or this addon won't work.
Note #3: This /should/ correctly remember

I made this for some dude who wanted a single button to always cast sinister strike with his fast weapons until he had 5 combo points, THEN when he had 5 combo points the button would automatically detect that and swtich to his slower but stronger weapon and then cast Eviscerate (instead of SS). I've heard SS isn't dependant on weapon damage and so there's no point for the above case. I don't know this, I don't play rogue much. This addon is made so you CAN change the spell to use when you have less than 5 combo points and the spell to use when you have 5.

RogueWeaponSwap v1.1