Added the following to support an optional world whitelist:

• Config options:
  • enabled-worlds (String list)
    • List of worlds where elo tracking is enabled
    • Default: "%all" for all worlds
      
    • Skips list entries that do not match worlds loaded by the server
      • Let me know if the timing of this check conflicts with any multi-world plugins
  • disabled-world-message (boolean)
    • Whether a message is sent to combatants on victim death in a non-tracked world
      
    • Default: false
• Command arguments for /eloa
  • world
    • Gets the next argument and toggles elo tracking for the named world
      
    • Tab-completes based on server's world list
      
    • Fails if internal boolean allEnabled is true, or if world is not found
  • allworlds
    • Toggles internal boolean allEnabled, toggling between server-wide and per-world tracking
  • disabledworldmessage
    • Toggles disabled-world-message

***Plugin download is now served by a self-hosted website to consolidate uploads.***

Two changes:

• Removed Spigot API erroneously included when building JAR
• Fixed logic error when disabling nametags

Four changes:

• Now uses NametagEdit for nametag support, as it is updated more often and is much more popular (likely to remain supported)
• Compiled against Spigot API 1.20.2 to ensure compatibility*
• Uploaded source to GitHub
• Cleaned up code a little bit based on the IDE's suggestions

*I set the API version to 1.20 in the plugin.yml. Let me know if this breaks compatibility with older versions, because I am not sure whether this is a hard minimum or not.

Changes:

• Fixed small bug with tab autocompleter that didn't allow second arguments to be autocompleted (e.g. a player's name with /elo check)
• Tweaked some of the code to prepare for API access
  • Only planning to allow reading and modification of player stats, so you could, for instance, make a plugin that does something when a player hits a certain rank, or gets their elo higher than a target, etc.
• Fixed small performance bug
  • Entire list of players is no longer saved to config and then reloaded whenever a brand new player joins
  • Likely had very little performance impact, but fixed anyway

It's time for a full release! In testing, I have not encountered any issues, but if you run into anything, please let me know!

Changes:

• Added tab autocomplete
  • Makes typing commands a bit faster
• Added code to remove old, unused config options automatically
  • Noticed min and max elo still present in old configs
• Default prefix now uses dark aqua color (&9) for name
  • I just think it looks nicer
    

Plans:

• None at the moment! I've added everything I've had a vision for, but if you have an idea, let me know!

Forgot to update version name. Previous download from moments ago is 1.0 pre 1, but it was not labeled as such on Spigot.

Lots of bugs were ironed out, and a big new feature was added, per suggestion from our community! Thanks, Alterego!

Changes:

• (From suggestion) Add option for GUI displaying /elo top
  • Shows top 9 players, plus the user's ranking in second row
  • Hovering over the displayed heads shows position, elo rating, and percentile
  • Enabled by default, toggled with /eloadmin gui
• Cosmetic changes to make things more pretty <3

To do for 1.0 full release:

• Tab autocomplete
  • Makes typing commands a bit faster
• Remove old config options automatically
  • Noticed min and max still present in old configs

Changes:

• Fixed logic error when setting base and max adjustment
  • Would set the value before checking against the other, but only write to config after check
• Added configurable max ratio
  • Integer option
  • Set it lower than base adjustment to encourage more even fights
  • Lets you use a high base adjustment without opening up opportunity for bullying
  • Base adjustment is still the hard cap on ratio, due to adjustment calculation formula
  • Default is 5, or 5:1
• Added configurable max portion
  • Decimal option, ranging from 0.0 < max portion <= 1.0.
  • Caps adjustment to a portion of the victim's rating
  • Default is 0.25 or 25%
• Added comments to config
  • Added shameless plug support link
• Added shameless plug support link to /version PvPElo
• Clarification for adjustment override priority:
  1. Check if victim rating is 1. If yes, adjustment is 0
  2. Check if max ratio is exceeded. If yes, adjustment is 0
  3. Check if max portion is exceeded. If yes, adjustment is capped to max portion.
  4. Check if max adjustment is exceeded. If yes, adjustment is capped to max adjustment.
• Added leaderboard position and percentile to /elo check
  • More useful info available to players
• Top 10 board now shows configured elo color as well as colored names for the top 3.
• Added color to various messages to improve readability.

To do for 1.0 full release

• Tab autocomplete
  • Makes typing commands a bit faster
• (From suggestion) Add option for GUI displaying /elo top
  • Shows top 8 players, plus the user's ranking in slot 9
  • Hovering over the displayed heads shows position, elo rating, and percentile

Changes:

• Elo is now referred to as "rating" in most places.
  • Score is "rating;" unit is "elo"
• Maximum and minimum rating are no longer configurable.
  • Rating is now uncapped*, and the minimum is 1.
• Base and maximum adjustments are configurable.
  • Default: 75 base, 500 maximum
• Adjustments are still equal for both killer and victim.
  
• Minimum adjustment is 0, which occurs when the ratio between killer and victim exceeds the base adjustment's value
  • Example: If base adjustment is 75, then a player with a 3750 rating will earn no adjustment for killing a player with a rating below 50, because 3750:50 = 75:1.
• If a victim has 1 elo, then the adjustment for both players is 0 in any case.
• Adjustment is hard-capped to 50% of the victim's rating.
  • There were issues where two low-rated players with a large ratio fought, causing an adjustment substantially larger than either player's rating.
• Permissions slightly tweaked, so /elo is available without explicit permission.
  • Open to suggestions if it should not be available by default.
• Commands are slightly tweaked.
  • Shorter arguments - check documentation
  • New arguments for base and maximum adjustments
    
  • Using /eloadmin initial, base, or max without another argument informs you of the current respective value.
• Death/kill messages shortened for ease of reading.
• Config now includes notes for what each value represents.

Plans:

• Tab autocomplete (still)
• 1.0 full release

*Capped at the integer limit - over 2 billion.

First beta for the 1.0 release! adds lots of goodies, but not everything I want to put in the full release.

Changes:

• Added nametag support with TagAPI
  • TagAPI needs ProtocolLib to work. Currently, ProtocolLib support for 1.19.x is not finalized, so there may be bugs.
  • If TagAPI is not detected, nametag functionality is disabled.
  • TagAPI only supports up to 1.19. Do not use it if you are on 1.19.1 or higher.
• Added /eloa nametags
  • Toggles nametags; immediately updates
  • Still works if TagAPI is not present, though doesn't do anything except update the config
• Removed /eloa version
  • I missed Spigot supporting /version PvPElo

• Cleaned up code

• Fewer redundant variable declarations; should free up some memory
• Noticed a couple of logic errors that caused bigger errors

• Adjusted formula

• Now has minimum and maximum caps for adjustment amount
  • Minimum is 1, max is 10% of max elo
  • Resolved issue with absurdly high elo adjustment if the rating difference was too high

• Minimum elo is now hard-coded to 1
  • This prevents divide-by-zero issues with the formula introduced in the last update

Plans:

• Tab autocomplete for commands
• Likely remove maximum elo
  • The trouble with current environment is that when a max-capped player kills another player, elo is lost from the pool (sum of all players' elo). The only way to generate elo would be to kill min-capped players, as they would lose nothing and the killer would gain 1 elo.
    
  • Potential changes:
    • Minimum elo 1, maximum at integer limit (over 2 billion)
      • No longer configurable
    • Minimum adjustment 0, which occurs when the rating differential is too high
      
    • Re-work formula based on integer limit to modify "base payout"
      • Currently set to 1.5% of maximum elo

Changes:

• New elo calculation formula. Check the documentation.
• New, better aliases. Old aliases are still there, but "elo" and "eloa" are now available for ease of use.

Plans:

• Tab-autocomplete for command arguments
• Elo shown in nametag option

With these features, I will consider it functionally complete for a 1.0 release. Please let me know what other features you would like to see!

Renamed to PvP Elo, and tweaked for greater compatibility and functionality.

Changes:

• Name changed
  
• Version reverted, to reflect new status
• Commands and permissions renamed
• Config re-vamped
• Added elo-color option
• Changed rating shown next to names in chat to be handled by any chat plugin, using "varElo" variable
  • You will need something like EssentialsXChat to display elo ratings next to usernames in chat

Plans:

• Rework calculation formula to be more fair
• Add tab-autocomplete for command arguments
• Add option for elo in nametag?