Add doas config stuff

.config/zsh/custom/plugins/doas/README.md

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+# doas-zsh-plugin
+
+Easily prefix your current or previous commands with `doas` by pressing <kbd>esc</kbd> twice
+
+To use it, add the following to your zshrc:
+
+```console
+plugins=(doas)
+```
+
+## Usage
+
+### Current typed commands
+
+Say you have typed a long command and forgot to add `doas` in front:
+
+```console
+$ apt-get install build-essential
+```
+
+By pressing the <kbd>esc</kbd> key twice, you will have the same command with `doas` prefixed without typing:
+
+```console
+$ doas apt-get install build-essential
+```
+
+### Previous executed commands
+
+Say you want to delete a system file and denied:
+
+```console
+$ rm some-system-file.txt
+-su: some-system-file.txt: Permission denied
+$
+```
+
+By pressing the <kbd>esc</kbd> key twice, you will have the same command with `doas` prefixed without typing:
+
+```console
+$ rm some-system-file.txt
+-su: some-system-file.txt: Permission denied
+$ doas rm some-system-file.txt
+Password:
+$
+```
+
+Plugin inspired by sudo plugin by [Dongweiming](https://github.com/dongweiming)

.config/zsh/custom/plugins/doas/doas.plugin.zsh

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+# ------------------------------------------------------------------------------
+# Description
+# -----------
+#
+# doas will be inserted before the command
+#
+# ------------------------------------------------------------------------------
+# Authors
+# -------
+#
+# * Anatoly <akopyl@radner.ru>
+#
+# ------------------------------------------------------------------------------
+
+doas-command-line() {
+    [[ -z $BUFFER ]] && LBUFFER="$(fc -ln -1)"
+    if [[ $BUFFER == doas\ * ]]; then
+        if [[ ${#LBUFFER} -le 4 ]]; then
+            RBUFFER="${BUFFER#doas }"
+            LBUFFER=""
+        else
+            LBUFFER="${LBUFFER#doas }"
+        fi
+    else
+        LBUFFER="doas $LBUFFER"
+    fi
+}
+zle -N doas-command-line
+# Defined shortcut keys: [Esc] [Esc]
+bindkey -M emacs '\e\e' doas-command-line
+bindkey -M vicmd '\e\e' doas-command-line
+bindkey -M viins '\e\e' doas-command-line