feat(sudo): support aliases to $EDITOR (#9431)

Co-authored-by: Marc Cornellà <marc.cornella@live.com>

plugins/sudo/sudo.plugin.zsh

@@ -9,40 +9,48 @@
 # -------
 #
 # * Dongweiming <ciici123@gmail.com>
+# * Subhaditya Nath <github.com/subnut>
+# * Marc Cornellà <github.com/mcornella>
 #
 # ------------------------------------------------------------------------------
 
+__sudo-replace-buffer() {
+    local old=$1 new=$2 space=${2:+ }
+    if [[ ${#LBUFFER} -le ${#old} ]]; then
+        RBUFFER="${space}${BUFFER#$old }"
+        LBUFFER="${new}"
+    else
+        LBUFFER="${new}${space}${LBUFFER#$old }"
+    fi
+}
+
 sudo-command-line() {
     [[ -z $BUFFER ]] && LBUFFER="$(fc -ln -1)"
 
     # Save beginning space
     local WHITESPACE=""
-    if [[ ${LBUFFER:0:1} == " " ]] ; then 
+    if [[ ${LBUFFER:0:1} = " " ]]; then
         WHITESPACE=" "
         LBUFFER="${LBUFFER:1}"
     fi
 
-    if [[ -n $EDITOR && $BUFFER == $EDITOR\ * ]]; then
-        if [[ ${#LBUFFER} -le ${#EDITOR} ]]; then
-            RBUFFER=" ${BUFFER#$EDITOR }"
-            LBUFFER="sudoedit"
-        else
-            LBUFFER="sudoedit ${LBUFFER#$EDITOR }"
-        fi
-    elif [[ $BUFFER == sudoedit\ * ]]; then
-        if [[ ${#LBUFFER} -le 8 ]]; then
-            RBUFFER=" ${BUFFER#sudoedit }"
-            LBUFFER="$EDITOR"
-        else
-            LBUFFER="$EDITOR ${LBUFFER#sudoedit }"
-        fi
-    elif [[ $BUFFER == sudo\ * ]]; then
-        if [[ ${#LBUFFER} -le 4 ]]; then
-            RBUFFER="${BUFFER#sudo }"
-            LBUFFER=""
-        else
-            LBUFFER="${LBUFFER#sudo }"
+    # Get the first part of the typed command and check if it's an alias to $EDITOR
+    # If so, locally change $EDITOR to the alias so that it matches below
+    if [[ -n "$EDITOR" ]]; then
+        local cmd="${${(Az)BUFFER}[1]}"
+        if [[ "${aliases[$cmd]} " = (\$EDITOR|$EDITOR)\ * ]]; then
+            local EDITOR="$cmd"
         fi
+    fi
+
+    if [[ -n $EDITOR && $BUFFER = $EDITOR\ * ]]; then
+        __sudo-replace-buffer "$EDITOR" "sudoedit"
+    elif [[ -n $EDITOR && $BUFFER = \$EDITOR\ * ]]; then
+        __sudo-replace-buffer "\$EDITOR" "sudoedit"
+    elif [[ $BUFFER = sudoedit\ * ]]; then
+        __sudo-replace-buffer "sudoedit" "$EDITOR"
+    elif [[ $BUFFER = sudo\ * ]]; then
+        __sudo-replace-buffer "sudo" ""
     else
         LBUFFER="sudo $LBUFFER"
     fi
@@ -50,7 +58,9 @@ sudo-command-line() {
     # Preserve beginning space
     LBUFFER="${WHITESPACE}${LBUFFER}"
 }
+
 zle -N sudo-command-line
+
 # Defined shortcut keys: [Esc] [Esc]
 bindkey -M emacs '\e\e' sudo-command-line
 bindkey -M vicmd '\e\e' sudo-command-line