fix: Completions use custom install location

Also, replace calls to `tr` with fish built-in

CHANGELOG.md

@@ -5,6 +5,12 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/), and
 this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+## [Unreleased]
+
+### Fixes
+
+- Completions use custom SDKMAN! install path (#48; thanks, @Bryan2333!)
+
 ## [2.0.0] - 2023-06-27
 
 ### Breaking

completions/sdk.fish

@@ -60,21 +60,21 @@ end
 # # # # # #
 
 function __fish_sdkman_candidates
-    cat "$HOME"/.sdkman/var/candidates | tr ',' '\n'
+    cat "$SDKMAN_DIR"/var/candidates | string replace -a -r ',' '\n'
 end
 
 function __fish_sdkman_candidates_with_versions
     set regexpHome (string replace -a '/' '\\/' "$HOME/")
 
-    find "$HOME"/.sdkman/candidates/ -mindepth 2 -maxdepth 2 -name '*current' \
+    find "$SDKMAN_DIR"/candidates/ -mindepth 2 -maxdepth 2 -name '*current' \
     | awk -F '/' '{ print $(NF-1) }' \
     | sort -u
 end
 
 function __fish_sdkman_installed_versions
     set cmd (commandline -opc)
-    if [ -d "$HOME"/.sdkman/candidates/$cmd[3]/current ]
-        ls -v1 "$HOME"/.sdkman/candidates/$cmd[3] | grep -v current
+    if [ -d "$SDKMAN_DIR"/candidates/$cmd[3]/current ]
+        ls -v1 "$SDKMAN_DIR"/candidates/$cmd[3] | grep -v current
     end
 end