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## git2r, R bindings to the libgit2 library.
## Copyright (C) 2013-2022 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.
##' Number of files in git_diff object
##'
##' @param x The git_diff \code{object}
##' @return a non-negative integer
##' @export
length.git_diff <- function(x) {
length(x$files)
}
##' @export
print.git_diff <- function(x, ...) {
cat("Old: ")
if (is.character(x$old)) {
cat(x$old, "\n")
} else if (inherits(x$old, "git_tree")) {
print(x$old)
} else {
cat("\n")
print(x$old)
}
cat("New: ")
if (is.character(x$new)) {
cat(x$new, "\n")
} else if (inherits(x$new, "git_tree")) {
print(x$new)
} else {
cat("\n")
print(x$new)
}
invisible(x)
}
lines_per_file <- function(diff) {
lapply(diff$files, function(x) {
del <- add <- 0
for (h in x$hunks) {
for (l in h$lines) {
if (l$origin == 45) {
del <- del + l$num_lines
} else if (l$origin == 43) {
add <- add + l$num_lines
}
}
}
list(file = x$new_file, del = del, add = add)
})
}
print_lines_per_file <- function(diff) {
lpf <- lines_per_file(diff)
files <- vapply(lpf, function(x) x$file, character(1))
del <- vapply(lpf, function(x) x$del, numeric(1))
add <- vapply(lpf, function(x) x$add, numeric(1))
paste0(format(files), " | ", "-", format(del), " +", format(add))
}
hunks_per_file <- function(diff) {
vapply(diff$files, function(x) length(x$hunks), numeric(1))
}
##' @export
summary.git_diff <- function(object, ...) {
print(object)
if (length(object) > 0) {
plpf <- print_lines_per_file(object)
hpf <- hunks_per_file(object)
hunk_txt <- ifelse(hpf > 1, " hunks",
ifelse(hpf > 0, " hunk",
" hunk (binary file)"))
phpf <- paste0(" in ", format(hpf), hunk_txt)
cat("Summary:", paste0(plpf, phpf), sep = "\n")
} else {
cat("No changes.\n")
}
}
##' Changes between commits, trees, working tree, etc.
##'
##' @rdname diff-methods
##' @export
##' @param x A \code{git_repository} object or the old \code{git_tree}
##' object to compare to.
##' @param index \describe{
##' \item{\emph{When object equals a git_repository}}{
##' Whether to compare the index to HEAD. If FALSE (the default),
##' then the working tree is compared to the index.
##' }
##' \item{\emph{When object equals a git_tree}}{
##' Whether to use the working directory (by default), or the index
##' (if set to TRUE) in the comparison to \code{object}.
##' }
##' }
##' @param as_char logical: should the result be converted to a
##' character string?. Default is FALSE.
##' @param filename If as_char is TRUE, then the diff can be written
##' to a file with name filename (the file is overwritten if it
##' exists). Default is NULL.
##' @param context_lines The number of unchanged lines that define the
##' boundary of a hunk (and to display before and after). Defaults
##' to 3.
##' @param interhunk_lines The maximum number of unchanged lines
##' between hunk boundaries before the hunks will be merged into
##' one. Defaults to 0.
##' @param old_prefix The virtual "directory" prefix for old file
##' names in hunk headers. Default is "a".
##' @param new_prefix The virtual "directory" prefix for new file
##' names in hunk headers. Defaults to "b".
##' @param id_abbrev The abbreviation length to use when formatting
##' object ids. Defaults to the value of 'core.abbrev' from the
##' config, or 7 if NULL.
##' @param path A character vector of paths / fnmatch patterns to
##' constrain diff. Default is NULL which include all paths.
##' @param max_size A size (in bytes) above which a blob will be
##' marked as binary automatically; pass a negative value to
##' disable. Defaults to 512MB when max_size is NULL.
##' @return A \code{git_diff} object if as_char is FALSE. If as_char
##' is TRUE and filename is NULL, a character string, else NULL.
##' @section Line endings:
##'
##' Different operating systems handle line endings
##' differently. Windows uses both a carriage-return character and a
##' linefeed character to represent a newline in a file. While Linux
##' and macOS use only the linefeed character for a newline in a
##' file. To avoid problems in your diffs, you can configure Git to
##' properly handle line endings using the \verb{core.autocrlf}
##' setting in the Git config file, see the Git documentation
##' (\url{https://git-scm.com/}).
##' @examples
##' \dontrun{
##' ## Initialize a repository
##' path <- tempfile(pattern="git2r-")
##' dir.create(path)
##' repo <- init(path)
##'
##' ## Config user
##' 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")
##'
##' ## Change the file
##' writeLines(c("Hello again!", "Here is a second line", "And a third"),
##' file.path(path, "test.txt"))
##'
##' ## diff between index and workdir
##' diff_1 <- diff(repo)
##' summary(diff_1)
##' cat(diff(repo, as_char=TRUE))
##'
##' ## Diff between index and HEAD is empty
##' diff_2 <- diff(repo, index=TRUE)
##' summary(diff_2)
##' cat(diff(repo, index=TRUE, as_char=TRUE))
##'
##' ## Diff between tree and working dir, same as diff_1
##' diff_3 <- diff(tree(commits(repo)[[1]]))
##' summary(diff_3)
##' cat(diff(tree(commits(repo)[[1]]), as_char=TRUE))
##'
##' ## Add changes, diff between index and HEAD is the same as diff_1
##' add(repo, "test.txt")
##' diff_4 <- diff(repo, index=TRUE)
##' summary(diff_4)
##' cat(diff(repo, index=TRUE, as_char=TRUE))
##'
##' ## Diff between tree and index
##' diff_5 <- diff(tree(commits(repo)[[1]]), index=TRUE)
##' summary(diff_5)
##' cat(diff(tree(commits(repo)[[1]]), index=TRUE, as_char=TRUE))
##'
##' ## Diff between two trees
##' commit(repo, "Second commit")
##' tree_1 <- tree(commits(repo)[[2]])
##' tree_2 <- tree(commits(repo)[[1]])
##' diff_6 <- diff(tree_1, tree_2)
##' summary(diff_6)
##' cat(diff(tree_1, tree_2, as_char=TRUE))
##'
##' ## 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)
##' summary(diff_7)
##' cat(diff(repo, index=TRUE, as_char=TRUE))
##' }
diff.git_repository <- function(x,
index = FALSE,
as_char = FALSE,
filename = NULL,
context_lines = 3,
interhunk_lines = 0,
old_prefix = "a",
new_prefix = "b",
id_abbrev = NULL,
path = NULL,
max_size = NULL,
...) {
if (isTRUE(as_char)) {
## Make sure filename is character(0) to write to a
## character vector or a character vector with path in
## order to write to a file.
filename <- as.character(filename)
if (any(identical(filename, NA_character_),
identical(nchar(filename), 0L))) {
filename <- character(0)
} else if (length(filename)) {
filename <- normalizePath(filename, mustWork = FALSE)
}
} else {
## Make sure filename is NULL
filename <- NULL
}
if (!is.null(id_abbrev))
id_abbrev <- as.integer(id_abbrev)
if (!is.null(max_size))
max_size <- as.integer(max_size)
.Call(git2r_diff, x, NULL, NULL, index, filename,
as.integer(context_lines), as.integer(interhunk_lines),
old_prefix, new_prefix, id_abbrev, path, max_size)
}
##' @rdname diff-methods
##' @param new_tree The new git_tree object to compare, or NULL. If
##' NULL, then we use the working directory or the index (see the
##' \code{index} argument).
##' @param ... Not used.
##' @export
diff.git_tree <- function(x,
new_tree = NULL,
index = FALSE,
as_char = FALSE,
filename = NULL,
context_lines = 3,
interhunk_lines = 0,
old_prefix = "a",
new_prefix = "b",
id_abbrev = NULL,
path = NULL,
max_size = NULL,
...) {
if (isTRUE(as_char)) {
## Make sure filename is character(0) to write to a character
## vector or a character vector with path in order to write to
## a file.
filename <- as.character(filename)
if (any(identical(filename, NA_character_),
identical(nchar(filename), 0L))) {
filename <- character(0)
} else if (length(filename)) {
filename <- normalizePath(filename, mustWork = FALSE)
}
} else {
## Make sure filename is NULL
filename <- NULL
}
if (!is.null(new_tree)) {
if (!inherits(new_tree, "git_tree")) {
stop("Not a git tree")
}
if (x$repo$path != new_tree$repo$path) {
stop("Cannot compare trees in different repositories")
}
}
if (!is.null(id_abbrev))
id_abbrev <- as.integer(id_abbrev)
if (!is.null(max_size))
max_size <- as.integer(max_size)
.Call(git2r_diff, NULL, x, new_tree, index, filename,
as.integer(context_lines), as.integer(interhunk_lines),
old_prefix, new_prefix, id_abbrev, path, max_size)
}
##' @export
base::diff
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