Subject: [PATCH] ui: Improve sort order when searching package names.

From: Lars-Dominik Braun <[email-masked]>
Date: Wed, 28 Sep 2022 11:27:37 +0200

Hi,

we provide a `guix serach`-based package search to our users and noticed
that searching for “ggplot2” yields the package r-ggplot2 on position
11 only – when it should be the first. Looking at other potential
search terms (haven, shiny, ape, renv, here, ini, setuptools) reveals
similar issues.

I propose we also score the unprefixed package name, so SCORE can award
bonus points for a full string match. I don’t like that we have to
maintain a list of common prefixes for this and that package names are
scored twice now, but I can’t think of a better solution right now.

Cheers,
Lars

* guix/ui.scm (%package-metrics): Increase score for PACKAGE-NAME and
add score for unprefixed package name.
---
 guix/ui.scm | 33 ++++++++++++++++++++++++++++++++-
 1 file changed, 32 insertions(+), 1 deletion(-)

diff --git a/guix/ui.scm b/guix/ui.scm
index dad2b853ac..55b596ed35 100644
--- a/guix/ui.scm
+++ b/guix/ui.scm
@@ -1655,7 +1655,38 @@ (define (regexp->score regexp)
 (define %package-metrics
   ;; Metrics used to compute the "relevance score" of a package against a set
   ;; of regexps.
-  `((,package-name . 4)
+  `((,package-name . 8)
+
+    ;; For packages with a language prefix (namespaces), also compare the
+    ;; unprefixed name, so searching for “ggplot2” yields
+    ;; r-ggplot2 as first result instead of other, higher-ranked packages,
+    ;; which contain “ggplot2” in their description alot.
+    (,(lambda (package)
+        (let ((namespaces (list "cl-"
+                                "ecl-"
+                                "emacs-"
+                                "ghc-"
+                                "go-"
+                                "guile-"
+                                "java-"
+                                "julia-"
+                                "node-"
+                                "ocaml-"
+                                "perl-"
+                                "python-"
+                                "r-"
+                                "ruby-"
+                                "rust-"
+                                "sbcl-"
+                                "texlive-"))
+              (name (package-name package)))
+          (fold (lambda (prefix accum)
+                  (if (string-prefix? prefix name)
+                      (cons (substring name (string-length prefix)) accum)
+                      accum))
+                '()
+                namespaces)))
+       . 4)
 
     ;; Match against uncommon outputs.
     (,(lambda (package)
-- 
2.35.1