## git2r, R bindings to the libgit2 library.
## Copyright (C) 2013-2014 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.
##' Plot contributions over time
##'
##' @rdname plot-methods
##' @aliases plot
##' @aliases plot-methods
##' @docType methods
##' @param x The repository to plot
##' @param breaks Default is \code{month}. Change to year, quarter,
##' week or day as necessary.
##' @param by Contributions by "commits" or "author". Default is
##' "commits".
##' @param title Default title for the plot is "Commits on repo:" and
##' repository workdir basename. Supply a new title if you desire one.
##' @return A \code{ggplot} chart
##' @keywords methods
##' @import ggplot2
##' @import git2r
##' @importFrom scales date_format
##' @export
setMethod("plot",
signature(x = "git_repository"),
function (x,
breaks = c("month", "year", "quarter", "week", "day"),
by = c("commits", "author"),
title = "Commits")
{
breaks = match.arg(breaks)
by = match.arg(by)
df <- contributions(x, breaks = breaks, by = by)
xlab <- switch(breaks,
"year" = "Year",
"quarter" = "Quarter",
"month" = "Month",
"week" = "Week",
"day" = "Day")
ylab <- "Number of commits"
title <- sprintf("Commits on repository: %s", basename(workdir(x)))
if (identical(by, "commits")) {
ggplot(df, aes(x = when, y = n)) +
geom_bar(stat = "identity", fill = "steelblue") +
scale_x_date(xlab, labels = scales::date_format("%m-%Y")) +
scale_y_continuous(ylab) +
ggtitle(title) + theme_gray()
} else {
ggplot(df, aes(x = when, y = n, group = author, fill = author)) +
geom_bar(stat = "identity", color = "black") +
scale_x_date(xlab, labels = scales::date_format("%m-%Y")) +
scale_y_continuous(ylab) +
ggtitle(title) + theme_gray()
}
}
)
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