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

> 
> 
> ## Create a directory in tempdir
> path <- tempfile(pattern = "git2r-")
> dir.create(path)
> 
> ## Initialize a repository
> repo <- init(path)
> config(repo, user.name = "Alice", user.email = "alice@example.org")
> 
> ## Create a file, add, commit
> writeLines("Hello world!", file.path(path, "test.txt"))
> add(repo, "test.txt")
> commit(repo, "Commit message")
[f091599] 2023-11-26: Commit message
> 
> ## Change the file, diff between index and workdir
> writeLines("Hello again!\nHere is a second line\nAnd a third",
+            file.path(path, "test.txt"))
> diff_1 <- diff(repo)
> diff(repo, as_char = TRUE)
[1] "diff --git a/test.txt b/test.txt\nindex dfd6895..0055243 100644\n--- a/test.txt\n+++ b/test.txt\n@@ -1 +1,3 @@\n-Hello world!\r\n+Hello again!\r\n+Here is a second line\r\n+And a third\r\n"
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_1$old, "index"))
> stopifnot(identical(diff_1$new, "workdir"))
> stopifnot(identical(length(diff_1$files), 1L))
> stopifnot(identical(diff_1$files[[1]]$old_file, "test.txt"))
> stopifnot(identical(diff_1$files[[1]]$new_file, "test.txt"))
> stopifnot(identical(length(diff_1$files[[1]]$hunks), 1L))
> stopifnot(identical(length(diff_1$files[[1]]$hunks[[1]]$lines), 4L))
> ## TODO: check actual diff
> 
> ## Diff between index and HEAD is empty
> diff_2 <- diff(repo, index = TRUE)
> diff(repo, as_char = TRUE)
[1] "diff --git a/test.txt b/test.txt\nindex dfd6895..0055243 100644\n--- a/test.txt\n+++ b/test.txt\n@@ -1 +1,3 @@\n-Hello world!\r\n+Hello again!\r\n+Here is a second line\r\n+And a third\r\n"
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_2$old, "HEAD"))
> stopifnot(identical(diff_2$new, "index"))
> stopifnot(identical(diff_2$files, list()))
> 
> ## Diff between tree and working dir, same as diff_1
> diff_3 <- diff(tree(commits(repo)[[1]]))
> diff(repo, as_char = TRUE)
[1] "diff --git a/test.txt b/test.txt\nindex dfd6895..0055243 100644\n--- a/test.txt\n+++ b/test.txt\n@@ -1 +1,3 @@\n-Hello world!\r\n+Hello again!\r\n+Here is a second line\r\n+And a third\r\n"
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_3$old, tree(commits(repo)[[1]])))
> stopifnot(identical(diff_3$new, "workdir"))
> stopifnot(identical(diff_3$files, diff_1$files))
> stopifnot(identical(print(diff_3), diff_3))
Old:  tree: 1021ec8da99758dbb8dfc8edb2a12a2c5bcc39dd

    mode type                                      sha     name
1 100644 blob dfd68952a9ba420d898d4e3a666256e8f3a20602 test.txt
New:  workdir 
> 
> ## Add changes, diff between index and HEAD is the same as diff_1
> add(repo, "test.txt")
> diff_4 <- diff(repo, index = TRUE)
> diff(repo, as_char = TRUE)
[1] ""
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_4$old, "HEAD"))
> stopifnot(identical(diff_4$new, "index"))
> stopifnot(identical(diff_4$files, diff_1$files))
> 
> ## Diff between tree and index
> diff_5 <- diff(tree(commits(repo)[[1]]), index = TRUE)
> diff(repo, as_char = TRUE)
[1] ""
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_5$old, tree(commits(repo)[[1]])))
> stopifnot(identical(diff_5$new, "index"))
> stopifnot(identical(diff_5$files, diff_1$files))
> 
> ## Diff between two trees
> commit(repo, "Second commit")
[814be39] 2023-11-26: Second commit
> tree_1 <- tree(commits(repo)[[2]])
> tree_2 <- tree(commits(repo)[[1]])
> diff_6 <- diff(tree_1, tree_2)
> diff(repo, as_char = TRUE)
[1] ""
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(identical(diff_6$old, tree_1))
> stopifnot(identical(diff_6$new, tree_2))
> stopifnot(identical(diff_6$files, diff_1$files))
> 
> ## Length of a diff
> stopifnot(identical(length(diff_1), 1L))
> stopifnot(identical(length(diff_2), 0L))
> stopifnot(identical(length(diff_3), 1L))
> stopifnot(identical(length(diff_4), 1L))
> stopifnot(identical(length(diff_5), 1L))
> stopifnot(identical(length(diff_6), 1L))
> 
> ## Binary files
> set.seed(42)
> writeBin(as.raw((sample(0:255, 1000, replace = TRUE))),
+          con = file.path(path, "test.bin"))
> add(repo, "test.bin")
> diff_7 <- diff(repo, index = TRUE)
> diff(repo, as_char = TRUE)
[1] ""
> diff(repo, as_char = TRUE, filename = file.path(path, "test.diff"))
NULL
> 
> stopifnot(any(grepl("binary file", capture.output(summary(diff_7)))))
> 
> ## TODO: errors
> ## Check non-logical index argument
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, NULL, NULL, NULL, "FALSE",
+                         NULL, 3L, 0L, "a", "b", NULL, NULL, NULL))
> stopifnot(length(grep(paste0("Error in 'git2r_diff': 'index' must be logical ",
+                              "vector of length one with non NA value\n"),
+                       res[[1]]$message)) > 0)
> 
> ## Check various combinations of diff arguments
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, NULL, NULL,
+                         tree(commits(repo)[[1]]),
+                         FALSE, NULL, 3L, 0L, "a", "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, NULL, NULL,
+                         tree(commits(repo)[[1]]),
+                         TRUE, NULL, 3L, 0L, "a", "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, repo, tree(commits(repo)[[1]]),
+                         NULL, FALSE, NULL, 3L, 0L, "a", "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, repo, tree(commits(repo)[[1]]),
+                         NULL, TRUE, NULL, 3L, 0L, "a", "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, repo, tree(commits(repo)[[1]]),
+                         tree(commits(repo)[[2]]), FALSE, NULL, 3L, 0L, "a",
+                         "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> res <- tools::assertError(
+                   .Call(git2r:::git2r_diff, repo, tree(commits(repo)[[1]]),
+                         tree(commits(repo)[[2]]), TRUE, NULL, 3L, 0L, "a",
+                         "b", NULL, NULL, NULL))
> stopifnot(length(grep("Error in 'git2r_diff': Invalid diff parameters",
+                       res[[1]]$message)) > 0)
> 
> ## TODO: printing
> 
> ## Cleanup
> unlink(path, recursive = TRUE)
> 
> proc.time()
   user  system elapsed 
   0.20    0.14    0.32