zsh: add vim-keybindings

zsh/keybindings.zsh

@@ -0,0 +1,12 @@
+# ===== keybindings
+# use Vi(m) style key bindings.
+bindkey -v
+
+# ===== history bindings
+# make ^P and ^N behave like arrow keys (scroll through history)
+bindkey -a '^P' history-beginning-search-backward
+bindkey -a '^N' history-beginning-search-forward
+
+# re-enable incremental backward search for vim keybindings which is especially
+# useful when the string is an argument and not the command.
+bindkey '^R' history-incremental-pattern-search-backward