FenCore Library

FenCore is a pure logic library for WoW addons - no UI dependencies, just utility functions.

Design Philosophy

• Pure Functions: No side effects, predictable outputs
• No UI Dependencies: Works in any layer of your addon
• Testable: All functions can be unit tested without WoW
• Documented: Every function has clear input/output contracts

MCP Tools

Task	MCP Tool
List All Functions	fencore.catalog()
Search Functions	fencore.search(query="clamp")
Get Function Details	fencore.info(domain="Math", function="Clamp")

Domains

FenCore organizes functions by domain:

Domain	Purpose	Examples
Math	Numeric operations	Clamp, Round, Lerp, InRange
Table	Table manipulation	Copy, Merge, Filter, Map
String	String utilities	Split, Trim, StartsWith, Format
Color	Color manipulation	HexToRGB, RGBToHex, Lighten, Darken
Time	Time formatting	FormatDuration, FormatTime, ParseDuration
Environment	WoW detection	IsRetail, IsClassic, GetExpansion

Usage Pattern

local FenCore = LibStub("FenCore")

-- Access by domain
local Math = FenCore.Math
local result = Math.Clamp(value, 0, 100)

-- Or direct access
local clamped = FenCore.Math.Clamp(value, 0, 100)

Common Functions

Math

FenCore.Math.Clamp(value, min, max)     -- Constrain value to range
FenCore.Math.Round(value, decimals)      -- Round to decimal places
FenCore.Math.Lerp(a, b, t)              -- Linear interpolation
FenCore.Math.InRange(value, min, max)   -- Check if value in range

Table

FenCore.Table.Copy(tbl)                 -- Shallow copy
FenCore.Table.DeepCopy(tbl)             -- Deep copy
FenCore.Table.Merge(base, override)     -- Merge tables
FenCore.Table.Filter(tbl, predicate)    -- Filter by function
FenCore.Table.Map(tbl, transform)       -- Transform values

Environment

FenCore.Environment.IsRetail()          -- true if retail client
FenCore.Environment.IsClassic()         -- true if classic client
FenCore.Environment.GetExpansion()      -- "TWW", "Classic", etc.
FenCore.Environment.GetBuildInfo()      -- version, build, date

Best Practices

1. Use for Core layer - FenCore belongs in your addon's pure logic layer
2. Don't wrap unnecessarily - Call FenCore directly, don't create wrappers
3. Check domain first - Use fencore.search to find existing functions before writing your own
4. Prefer pure functions - If you need state, that belongs in Bridge layer