feat: Implement auto-detection of subexecutor

.github/CODEOWNERS

@@ -12,3 +12,6 @@ plugins/starship/                   @axieax
 plugins/universalarchive/           @Konfekt
 plugins/wp-cli/                     @joshmedeski
 plugins/zoxide/                     @ajeetdsouza
+
+# Core library owners
+lib/00subexecutor.zsh               @pepoluan

README.md

@@ -44,6 +44,7 @@ To learn more, visit [ohmyz.sh](https://ohmyz.sh), follow [@ohmyzsh](https://twi
   - [Enable GNU ls In macOS And freeBSD Systems](#enable-gnu-ls-in-macos-and-freebsd-systems)
   - [Skip Aliases](#skip-aliases)
   - [Disable async git prompt](#disable-async-git-prompt)
+  - [Specifying a Subexecutor](#specifying-a-subexecutor)
 - [Getting Updates](#getting-updates)
   - [Updates Verbosity](#updates-verbosity)
   - [Manual Updates](#manual-updates)
@@ -382,6 +383,39 @@ zstyle ':omz:alpha:lib:git' async-prompt no
 > It is also not currently aware of "aliases" that are defined as functions. Example of such
 > are `gccd`, `ggf`, or `ggl` functions from the git plugin.
 
+
+### Specifying a Subexecutor
+
+A ***subexecutor*** is a tool that can execute other programs as if running using a different user, usually as `EUID=0` (`root`).
+
+The most well-known subexecutor is probably the `sudo` tool; however, `sudo` is not the only subexecutor tool available. In addition, `sudo` is only available for the Gnu/Linux operating system.
+
+Users of *BSD operating systems usually just use either the `su` tool or the `doas` tool; the latter is now also available for Gnu/Linux through the [OpenDoas](https://github.com/Duncaen/OpenDoas) package.
+
+By default, Oh My Zsh will try to automatically detect which subexecutor is in use (prioritizing detection of `doas` over `sudo`). However, you can explicitly specify which subexecutor you want to use using the following:
+
+```sh
+zstyle ':omz' subexecutor $SUBEXECUTOR
+
+# For example, if you want to use sudo as the subexecutor regardless of the result of detection, specify:
+zstyle ':omz' subexecutor sudo
+```
+
+To allow flexibility/transparency, a function `subex` is provided. With this function, you can invoke the subexecutor without needing to know which subexecutor is available on the system; this will be very helpful for instance if you are writing plugins for Oh My Zsh.
+
+```sh
+# Example of editing a root-only-editable file
+subex vim /etc/hosts
+
+# Example of creating a new user
+subex useradd -m -s $(which zsh) user2
+```
+
+Do note that the `subex` function is a thin wrapper around the subexecutor: it passes all arguments to the subexecutor without any processing; it is not meant to be a compatibility thunking layer between the various subexecutor tools available. Care must still be taken if you need to use subexecutor-specific options because what's available for one subexecutor might not be available for the other subexecutors.
+
+The `subex` function dynamically adjusts to in-session changes of `zstyle ':omz' subexecutor` value.
+
+
 ## Getting Updates
 
 By default, you will be prompted to check for updates every 2 weeks. You can choose other update modes by adding a line to your `~/.zshrc` file, **before Oh My Zsh is loaded**:

lib/00subexecutor.zsh

@@ -0,0 +1,44 @@
+## Provides auto-detection of subexecutor to use
+
+# If in the future a new subexecuter is created, we only need to edit this array
+typeset _KNOWN_SUBEXES=( "doas" "sudo" )
+typeset _SUBEX
+
+function _SetupSubexecutor() {
+  local _i
+  local _cmd
+  zstyle -s ':omz' 'subexecutor' _SUBEX
+  if [[ "$_SUBEX" ]]; then
+    if command -v "$_SUBEX" > /dev/null; then
+      return 0
+    fi
+    print "Cannot find subexecutor '${_SUBEX}'; please check your configuration!" >&2
+    return 1
+  fi
+  for _i in "${_KNOWN_SUBEXES[@]}"; do
+    if command -v "$_i" > /dev/null; then
+      _SUBEX="$_i"
+      break
+    fi
+  done
+  if [[ -z $_SUBEX ]]; then
+    print "oh-my-zsh: cannot auto-detect subexecutor; please specify explicitly using 'zstyle :omz subexecutor'." >&2
+    return 1
+  fi
+  zstyle ':omz' 'subexecutor' "$_SUBEX"
+}
+
+_SetupSubexecutor
+unfunction _SetupSubexecutor
+unset _KNOWN_SUBEXES
+
+# The alias provides a 'hardcoded', invariant subexecutor to use throughout the shell session
+alias _="$_SUBEX "
+
+# The function is, in contrast, modifiable by changing the :omz->subexecutor zstyle
+function subex() {
+  local _subex
+  zstyle -s ':omz' 'subexecutor' _subex
+  ${_subex} "$@"
+}
+

lib/correction.zsh

@@ -3,8 +3,12 @@ if [[ "$ENABLE_CORRECTION" == "true" ]]; then
   alias man='nocorrect man'
   alias mkdir='nocorrect mkdir'
   alias mv='nocorrect mv'
-  alias sudo='nocorrect sudo'
   alias su='nocorrect su'
 
+  zstyle -s ':omz' 'subexecutor' _subex
+  alias "$_subex"="nocorrect $_subex"
+  unset _subex
+  alias subex='nocorrect subex'
+
   setopt correct_all
 fi

lib/misc.zsh

@@ -27,9 +27,6 @@ elif (( ${+commands[more]} )); then
   env_default 'PAGER' 'more'
 fi
 
-## super user alias
-alias _='sudo '
-
 ## more intelligent acking for ubuntu users and no alias for users without ack
 if (( $+commands[ack-grep] )); then
   alias afind='ack-grep -il'

lib/termsupport.zsh

@@ -95,8 +95,10 @@ function omz_termsupport_preexec {
     fi
   fi
 
-  # cmd name only, or if this is sudo or ssh, the next cmd
-  local CMD="${1[(wr)^(*=*|sudo|ssh|mosh|rake|-*)]:gs/%/%%}"
+  # cmd name only, or if this is doas/sudo or ssh, the next cmd
+  local _subex
+  zstyle -s ':omz' 'subexecutor' _subex
+  local CMD="${1[(wr)^(*=*|${_subex}|_|subex|ssh|mosh|rake|-*)]:gs/%/%%}"
   local LINE="${2:gs/%/%%}"
 
   title "$CMD" "%100>...>${LINE}%<<"