home: zsh: add extra mappings

Once again, old habits die hard...

home/zsh/default.nix

@@ -39,6 +39,7 @@
 
     initExtra = lib.concatMapStrings builtins.readFile [
       ./completion-styles.zsh
+      ./extra-mappings.zsh
       ./options.zsh
     ];
 

home/zsh/extra-mappings.zsh

@@ -0,0 +1,14 @@
+# Fix delete key not working 
+bindkey "\e[3~" delete-char
+
+# Fix Ctrl+u killing from the cursor instead of the whole line
+bindkey \^U backward-kill-line
+
+# Use Ctrl+x-(Ctrl+)e to edit the current command line in VISUAL/EDITOR
+autoload -U edit-command-line
+zle -N edit-command-line
+bindkey '^xe' edit-command-line
+bindkey '^x^e' edit-command-line
+
+# Enable Shift-Tab to go backwards in completion list
+bindkey '^[[Z' reverse-menu-complete