Replace $HOME with ~ in plugin state (#611)

Now it should be easier to sync dotfiles across machines
that have different $HOME locations.

Close #611

functions/fisher.fish

@@ -134,11 +134,12 @@ function fisher --argument-names cmd --description "A plugin manager for Fish"
                         for name in (string replace --filter --regex -- '.+/conf\.d/([^/]+)\.fish$' '$1' $$plugin_files_var)
                             emit {$name}_uninstall
                         end
-                        printf "%s\n" Removing\ (set_color red --bold)$plugin(set_color normal) "         "$$plugin_files_var
+                        printf "%s\n" Removing\ (set_color red --bold)$plugin(set_color normal) "         "$$plugin_files_var | string replace -- \~ ~
                         set --erase _fisher_plugins[$index]
                     end
 
-                    command rm -rf $$plugin_files_var
+                    command rm -rf (string replace -- \~ ~ $$plugin_files_var)
+
                     functions --erase (string replace --filter --regex -- '.+/functions/([^/]+)\.fish$' '$1' $$plugin_files_var)
 
                     for name in (string replace --filter --regex -- '.+/completions/([^/]+)\.fish$' '$1' $$plugin_files_var)
@@ -176,14 +177,15 @@ function fisher --argument-names cmd --description "A plugin manager for Fish"
                 end
 
                 set --local plugin_files_var _fisher_(string escape --style=var -- $plugin)_files
-                set --query files[1] && set --universal $plugin_files_var (string replace -- $source $fisher_path $files)
+
+                set --query files[1] && set --universal $plugin_files_var (string replace -- $source $fisher_path $files | string replace -- ~ \~)
 
                 contains -- $plugin $_fisher_plugins || set --universal --append _fisher_plugins $plugin
                 contains -- $plugin $install_plugins && set --local event install || set --local event update
 
-                printf "%s\n" Installing\ (set_color --bold)$plugin(set_color normal) "           "$$plugin_files_var
+                printf "%s\n" Installing\ (set_color --bold)$plugin(set_color normal) "           "$$plugin_files_var | string replace -- \~ ~
 
-                for file in (string match --regex -- '.+/[^/]+\.fish$' $$plugin_files_var)
+                for file in (string match --regex -- '.+/[^/]+\.fish$' $$plugin_files_var | string replace -- \~ ~)
                     source $file
                     if set --local name (string replace --regex -- '.+conf\.d/([^/]+)\.fish$' '$1' $file)
                         emit {$name}_$event
@@ -221,14 +223,17 @@ function fisher --argument-names cmd --description "A plugin manager for Fish"
     end
 end
 
-## Migrations ##
-function _fisher_fish_postexec --on-event fish_postexec
+if ! set --query _fisher_upgraded_to_4_4
+    set --universal _fisher_upgraded_to_4_4
     if functions --query _fisher_list
+        set --query XDG_DATA_HOME[1] || set --local XDG_DATA_HOME ~/.local/share
+        command rm -rf $XDG_DATA_HOME/fisher
+        functions --erase _fisher_{list,plugin_parse}
         fisher update >/dev/null 2>/dev/null
-        set --query XDG_DATA_HOME || set --local XDG_DATA_HOME ~/.local/share
-        test -e $XDG_DATA_HOME/fisher && command rm -rf $XDG_DATA_HOME/fisher
-        functions --erase _fisher_list _fisher_plugin_parse
-        set --erase fisher_data
+    else
+        for var in (set --names | string match --entire --regex '^_fisher_.+_files$')
+            set $var (string replace -- ~ \~ $$var)
+        end
+        functions --erase _fisher_fish_postexec
     end
-    functions --erase _fisher_fish_postexec
 end