R Under development (unstable) (2024-10-19 r87247 ucrt) -- "Unsuffered Consequences"
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> ## git2r, R bindings to the libgit2 library.
> ## Copyright (C) 2013-2023 The git2r contributors
> ##
> ## This program is free software; you can redistribute it and/or modify
> ## it under the terms of the GNU General Public License, version 2,
> ## as published by the Free Software Foundation.
> ##
> ## git2r is distributed in the hope that it will be useful,
> ## but WITHOUT ANY WARRANTY; without even the implied warranty of
> ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
> ## GNU General Public License for more details.
> ##
> ## You should have received a copy of the GNU General Public License along
> ## with this program; if not, write to the Free Software Foundation, Inc.,
> ## 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
> 
> library(git2r)
> 
> ## For debugging
> sessionInfo()
R Under development (unstable) (2024-10-19 r87247 ucrt)
Platform: x86_64-w64-mingw32/x64
Running under: Windows Server 2022 x64 (build 20348)

Matrix products: default


locale:
[1] LC_COLLATE=C                 LC_CTYPE=German_Germany.utf8
[3] LC_MONETARY=C                LC_NUMERIC=C                
[5] LC_TIME=C                   

time zone: Europe/Berlin
tzcode source: internal

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] git2r_0.35.0

loaded via a namespace (and not attached):
[1] compiler_4.5.0
> libgit2_version()
$major
[1] 1

$minor
[1] 7

$rev
[1] 2

> libgit2_features()
$threads
[1] TRUE

$https
[1] TRUE

$ssh
[1] FALSE

> 
> 
> ## Initialize a temporary repository
> path <- tempfile(pattern = "git2r-")
> dir.create(path)
> repo <- init(path, branch = "main")
> 
> ## Create a user and commit a file
> config(repo, user.name = "Author", user.email = "author@example.org")
> writeLines(c("First line in file 1.", "Second line in file 1."),
+            file.path(path, "example-1.txt"))
> add(repo, "example-1.txt")
> commit(repo, "First commit message")
[6d5b18e] 2024-10-20: First commit message
> 
> ## Create and add one more file
> writeLines(c("First line in file 2.", "Second line in file 2."),
+            file.path(path, "example-2.txt"))
> add(repo, "example-2.txt")
> commit(repo, "Second commit message")
[a826c5b] 2024-10-20: Second commit message
> 
> ## Create a new branch 'fix'
> checkout(repo, "fix", create = TRUE)
> 
> ## Update 'example-1.txt' (swap words in first line) and commit
> writeLines(c("line First in file 1.", "Second line in file 1."),
+            file.path(path, "example-1.txt"))
> add(repo, "example-1.txt")
> commit(repo, "Third commit message")
[5535f02] 2024-10-20: Third commit message
> 
> checkout(repo, "main")
> 
> ## Update 'example-2.txt' (swap words in second line) and commit
> writeLines(c("First line in file 2.", "line Second in file 2."),
+            file.path(path, "example-2.txt"))
> add(repo, "example-2.txt")
> commit(repo, "Fourth commit message")
[2cbccb4] 2024-10-20: Fourth commit message
> 
> # Missing branch to merge with should throw an error
> tools::assertError(merge(repo))
> 
> ## Merge 'fix'
> m <- merge(repo, "fix", TRUE, default_signature(repo))
> stopifnot(identical(format(m), "Merge"))
> 
> ## Merge 'fix' again
> m <- merge(repo, "fix", TRUE, default_signature(repo))
> stopifnot(identical(format(m), "Already up-to-date"))
> 
> ## Check number of parents of each commit
> stopifnot(identical(sapply(commits(repo), function(x) length(parents(x))),
+                     c(2L, 1L, 1L, 1L, 0L)))
> 
> ## Check that last commit is a merge
> stopifnot(is_merge(last_commit(repo)))
> summary(last_commit(repo))
Commit:  8b4f3768ebe7ad7763f141b2615cb6d5e596a38a
Merge:   2cbccb45c1906ad919c20c30952d5c78d9efd1ff
         5535f028d5b6ea56188fb688865f027263115049
Author:  Author <author@example.org>
When:    2024-10-20 08:07:54 GMT

     merge fix

Commit message:  2cbccb45c1906ad919c20c30952d5c78d9efd1ff 
     Fourth commit message
 
Commit message:  5535f028d5b6ea56188fb688865f027263115049 
     Third commit message
 
> 
> ## Check that metadata associated with merge is removed
> stopifnot(!file.exists(file.path(path, ".git", "MERGE_HEAD")))
> 
> ## Cleanup
> unlink(path, recursive = TRUE)
> 
> proc.time()
   user  system elapsed 
   0.32    0.26    0.53