Use builtin command in spago completions, add to changelog

CHANGELOG.rst

@@ -225,6 +225,7 @@ Completions
    -  ``rst2html``, ``rst2html4``, ``rst2html5``, ``rst2latex``,
       ``rst2man``, ``rst2odt``, ``rst2pseudoxml``, ``rst2s5``,
       ``rst2xetex``, ``rst2xml`` and ``rstpep2html`` (#7019)
+   -  ``spago`` (#7381)
    -  ``sphinx-apidoc``, ``sphinx-autogen``, ``sphinx-build`` and
       ``sphinx-quickstart`` (#7000)
    -  ``strace`` (#6656)

share/completions/spago.fish

@@ -1,17 +1,14 @@
 # fish completion for spago, PureScript package manager and build tool
 # version v0.16.0
 
-spago --fish-completion-script (which spago) | source
+spago --fish-completion-script (command -v spago) | source
 
 function __fish_spago_is_arg_n --argument-names n
     test $n -eq (count (string match -v -- '-*' (commandline -poc)))
 end
 
 function __fish_spago_pkgnames
-    for line in (spago ls packages 2> /dev/null)
-        set pkgname (echo $line | string match -r '[^\s]+')
-        echo $pkgname
-    end
+    spago ls packages 2>/dev/null | string match -r '\S+'
 end
 
 complete -c spago -n '__fish_seen_subcommand_from install; and __fish_spago_is_arg_n 2' -a '(__fish_spago_pkgnames)'