R Under development (unstable) (2023-11-25 r85635 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) (2023-11-25 r85635 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_0.33.0

loaded via a namespace (and not attached):
[1] compiler_4.4.0
> libgit2_version()
$major
[1] 1

$minor
[1] 7

$rev
[1] 1

> libgit2_features()
$threads
[1] TRUE

$https
[1] TRUE

$ssh
[1] FALSE

> 
> 
> ## Check when method
> w1 <- structure(list(time = 1395567947, offset = 60),
+                class = "git_time")
> stopifnot(identical(when(w1), "2014-03-23 09:45:47 GMT"))
> stopifnot(identical(when(w1, usetz = FALSE), "2014-03-23 09:45:47"))
> stopifnot(identical(when(w1, tz = "Europe/Stockholm", origin = "1980-02-02"),
+                     "2024-04-23 11:45:47 CEST"))
> 
> s1 <- structure(list(name = "Alice", email = "alice@example.org", when = w1),
+                 class = "git_signature")
> stopifnot(identical(when(s1), "2014-03-23 09:45:47 GMT"))
> stopifnot(identical(when(s1, usetz = FALSE), "2014-03-23 09:45:47"))
> stopifnot(identical(when(s1, tz = "Europe/Stockholm", origin = "1980-02-02"),
+                     "2024-04-23 11:45:47 CEST"))
> 
> w2 <- structure(list(time = 1395567950, offset = 60),
+                class = "git_time")
> s2 <- structure(list(name = "Alice", email = "alice@example.org", when = w2),
+                 class = "git_signature")
> c1 <- structure(list(sha = "166f3f779fd7e4165aaa43f2828050ce040052b0",
+                      author = s1,
+                      committer = s2,
+                      summary = "A commit summary",
+                      message = "A commit message"),
+                 class = "git_commit")
> stopifnot(identical(when(c1), "2014-03-23 09:45:47 GMT"))
> stopifnot(identical(when(c1, usetz = FALSE), "2014-03-23 09:45:47"))
> stopifnot(identical(when(c1, tz = "Europe/Stockholm", origin = "1980-02-02"),
+                     "2024-04-23 11:45:47 CEST"))
> 
> t1 <- structure(list(sha = "166f3f779fd7e4165aaa43f2828050ce040052b0",
+                      message = "A tag message",
+                      name = "A tage name",
+                      tagger = s1,
+                      target = "166f3f779fd7e4165aaa43f2828050ce040052b0"),
+                 class = "git_tag")
> stopifnot(identical(when(t1), "2014-03-23 09:45:47 GMT"))
> stopifnot(identical(when(t1, usetz = FALSE), "2014-03-23 09:45:47"))
> stopifnot(identical(when(t1, tz = "Europe/Stockholm", origin = "1980-02-02"),
+                     "2024-04-23 11:45:47 CEST"))
> 
> proc.time()
   user  system elapsed 
   0.14    0.04    0.17