remove redundant output from __fish_complete_cd

Fixes #4085

share/functions/__fish_complete_cd.fish

@@ -1,36 +1,38 @@
+# This function only emits completions that might result from matches against $CDPATH. We rely on
+# the core file name completion logic to include all other possible matches.
 function __fish_complete_cd -d "Completions for the cd command"
+    set -q CDPATH[1]
+    or return 0 # no CDPATH so rely solely on the core file name completions
+
     set -l token (commandline -ct)
-    # Absolute path or explicitly from the current directory - no descriptions and no CDPATH
-    if string match -qr '^\.?\.?/.*' -- $token
-        for d in $token*/
-            # Check if it's accessible - the glob only matches directories
-            [ -x $d ]
-            and printf "%s\n" $d
-        end
-    else # Relative path - check $CDPATH and use that as description
-        set -l cdpath $CDPATH
-        [ -z "$cdpath" ]
-        and set cdpath "."
-        # Remove the real path to "." (i.e. $PWD) from cdpath if we're in it
-        # so it doesn't get printed in the descriptions
-        if set -l ind (contains -i -- $PWD $cdpath)
-            and contains -- "." $cdpath
-            set -e cdpath[$ind]
-        end
-        # TODO: There's a subtlety regarding descriptions - if $cdpath[1]/foo and $cdpath[2]/foo exist, we print both
-        # but want the first description to win - this currently works, but is not guaranteed
-        for i in $cdpath
-            set -l desc
-            # Don't show description for current directory
-            # and replace $HOME with "~"
-            [ $i = "." ]
-            or set -l desc (string replace -r -- "^$HOME" "~" "$i")
-            # This assumes the CDPATH component itself is cd-able
-            for d in $i/$token*/
-                # Remove the cdpath component again
-                [ -x $d ]
-                and printf "%s\t%s\n" (string replace -r "^$i/" "" -- $d) $desc
-            end
+    if string match -qr '^\.{0,2}/.*' -- $token
+        # Absolute path or explicitly relative to the current directory. Rely on the builtin file
+        # name completions since we no longer exclude them from the `cd` argument completion.
+        return
+    end
+
+    # Relative path. Check $CDPATH and use that as the description for any possible matches.
+    # We deliberately exclude the `.` path because the core file name completion logic will include
+    # it when presenting possible matches.
+    set -l cdpath (string match -v '.' -- $CDPATH)
+
+    # Remove the CWD if it is in CDPATH since, again, the core file name completion logic will
+    # handle it.
+    set -l cdpath (string match -v -- $PWD $cdpath)
+    set -q cdpath[1]
+    or return 0
+
+    # TODO: There's a subtlety regarding descriptions - if $cdpath[1]/foo and $cdpath[2]/foo
+    # exist, we print both but want the first description to win - this currently works, but
+    # is not guaranteed.
+    for cdpath in $cdpath
+        # Replace $HOME with "~".
+        set -l desc (string replace -r -- "^$HOME" "~" "$cdpath")
+        # This assumes the CDPATH component itself is cd-able.
+        for d in $cdpath/$token*/
+            # Remove the cdpath component again.
+            test -x $d
+            and printf "%s\tCDPATH %s\n" (string replace -r "^$cdpath/" "" -- $d) $desc
         end
     end
 end