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generate commit messages for package updates

From: Ricardo Wurmus
Subject: generate commit messages for package updates
Date: Sat, 13 Jun 2020 00:40:58 +0200
User-agent: mu4e 1.4.4; emacs 26.3

Hi Guix,

I’m currently working on upgrading all Bioconductor packages to the 3.11
release.  The hardest work here is to write commit messages for the 200+
packages that have changed.  Even with the “update” yasnippet and magit
this takes a very long time.

I wrote a little tool to reduce the amount of time needed to create
commits.  It is not fully automatic yet as it requires my input to stage
hunks, but the commit messages it produces take all input changes into
account, which is something the “update” yasnippet does not do.

After “guix refresh -t bioconductor -u”, manually verifying and
implementing the suggested changes, and building all packages, I run
“git add -p” to stage hunks that belong to the same package definition.
Then I run the attached tool to make a commit:

    ./committer.scm | git commit -F -

The tool works by looking at the unified diff in the staging area and
generating two S-expressions corresponding to the original package
definition and the changed package definition, respectively.  It then
looks at the inputs, propagated-inputs, and native-inputs fields and
generates a GNU ChangeLog-style commit message describing the changes.

Here’s an example diff:

--8<---------------cut here---------------start------------->8---
modified   gnu/packages/bioconductor.scm
@@ -2701,29 +2701,32 @@ gene and isoform level using RNA-seq data")
 (define-public r-karyoploter
     (name "r-karyoploter")
-    (version "1.12.4")
+    (version "1.14.0")
     (source (origin
               (method url-fetch)
               (uri (bioconductor-uri "karyoploteR" version))
-                "03jmfgmw35hrgn3pc5lq6pblzhfx9fp4l6dx50rp303lr7kjxp9v"))))
+                "0h0gk4xd95k5phy6qcsv7j931d7gk3p24i2fg4mz5dsk110lpifs"))))
     (build-system r-build-system)
-     `(("r-regioner" ,r-regioner)
+     `(("r-annotationdbi" ,r-annotationdbi)
+       ("r-bamsignals" ,r-bamsignals)
+       ("r-bezier" ,r-bezier)
+       ("r-biovizbase" ,r-biovizbase)
+       ("r-digest" ,r-digest)
+       ("r-genomeinfodb" ,r-genomeinfodb)
+       ("r-genomicfeatures" ,r-genomicfeatures)
        ("r-genomicranges" ,r-genomicranges)
        ("r-iranges" ,r-iranges)
-       ("r-rsamtools" ,r-rsamtools)
        ("r-memoise" ,r-memoise)
+       ("r-regioner" ,r-regioner)
+       ("r-rsamtools" ,r-rsamtools)
        ("r-rtracklayer" ,r-rtracklayer)
-       ("r-genomeinfodb" ,r-genomeinfodb)
        ("r-s4vectors" ,r-s4vectors)
-       ("r-biovizbase" ,r-biovizbase)
-       ("r-digest" ,r-digest)
-       ("r-bezier" ,r-bezier)
-       ("r-bamsignals" ,r-bamsignals)
-       ("r-annotationdbi" ,r-annotationdbi)
        ("r-variantannotation" ,r-variantannotation)))
+    (native-inputs
+     `(("r-knitr" ,r-knitr)))
     (home-page "";)
     (synopsis "Plot customizable linear genomes displaying arbitrary data")
     (description "This package creates karyotype plots of arbitrary genomes and
--8<---------------cut here---------------end--------------->8---

…and this is the generated commit message:

--8<---------------cut here---------------start------------->8---
gnu: r-karyoploter: Update to 1.14.0.

* gnu/packages/bioconductor.scm (r-karyoploter): Update to 1.14.0.
[propagated-inputs]: Add r-genomicfeatures.
[native-inputs]: Add r-knitr.
--8<---------------cut here---------------end--------------->8---

Obviously, this can be improved by avoiding the staging area and
operating on all hunks in all selected files, so that more than one
commit can be made at a time.  But I thought I’d share this hack anyway,
crude as it is.


Attachment: committer.scm
Description: application/scheme

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