Updates re: master --> main

Closes #1480

Author: jennybc

R/course.R

@@ -41,8 +41,8 @@
 #' # download the source of rematch2 package from GitHub, 4 ways
 #' use_course("r-lib/rematch2")
 #' use_course("https://api.github.com/repos/r-lib/rematch2/zipball/HEAD")
-#' use_course("https://api.github.com/repos/r-lib/rematch2/zipball/master")
-#' use_course("https://github.com/r-lib/rematch2/archive/master.zip")
+#' use_course("https://api.github.com/repos/r-lib/rematch2/zipball/main")
+#' use_course("https://github.com/r-lib/rematch2/archive/main.zip")
 #' }
 NULL
 
@@ -161,7 +161,7 @@ use_zip <- function(url,
 #' Click on the repo's "Clone or download" button, to reveal a "Download ZIP"
 #' button. Capture this URL, which will have this form:
 #' ```
-#' https://github.com/r-lib/usethis/archive/master.zip
+#' https://github.com/r-lib/usethis/archive/main.zip
 #' ```
 #' This download link (or a shortlink that points to it) is suitable as input
 #' for `tidy_download()`. After one or more redirections, this link will
@@ -207,7 +207,7 @@ use_zip <- function(url,
 #'
 #' @examples
 #' \dontrun{
-#' tidy_download("https://github.com/r-lib/rematch2/archive/master.zip")
+#' tidy_download("https://github.com/r-lib/rematch2/archive/main.zip")
 #' }
 #'
 #' @section tidy_unzip():
@@ -239,8 +239,8 @@ use_zip <- function(url,
 #'
 #' @examples
 #' \dontrun{
-#' tidy_download("https://github.com/r-lib/rematch2/archive/master.zip")
-#' tidy_unzip("rematch2-master.zip")
+#' tidy_download("https://github.com/r-lib/rematch2/archive/main.zip")
+#' tidy_unzip("rematch2-main.zip")
 #' }
 NULL
 
@@ -563,7 +563,7 @@ check_is_zip <- function(ct) {
 ## https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Disposition
 ## https://tools.ietf.org/html/rfc6266
 ## DropBox eg: "attachment; filename=\"foo.zip\"; filename*=UTF-8''foo.zip\"
-##  GitHub eg: "attachment; filename=foo-master.zip"
+##  GitHub eg: "attachment; filename=foo-main.zip"
 # https://stackoverflow.com/questions/30193569/get-content-disposition-parameters
 # http://test.greenbytes.de/tech/tc2231/
 parse_content_disposition <- function(cd) {

R/create.R

@@ -144,7 +144,7 @@ create_project <- function(path,
 #'   * The source repo, `repo_spec`, is configured as the `upstream` remote,
 #'   using the indicated `protocol`.
 #'   * The local `DEFAULT` branch is set to track `upstream/DEFAULT`, where
-#'   `DEFAULT` is typically `master` or `main`. It is also immediately pulled,
+#'   `DEFAULT` is typically `main` or `master`. It is also immediately pulled,
 #'   to cover the case of a pre-existing, out-of-date fork.
 #'
 #'   If `fork = NA` (the default), we check your permissions on `repo_spec`. If

R/github.R

@@ -4,15 +4,15 @@
 #' `use_github()` takes a local project and:
 #' * Checks that the initial state is good to go:
 #'   - Project is already a Git repo
-#'   - Current branch is the default branch, e.g. `master` or `main`
+#'   - Current branch is the default branch, e.g. `main` or `master`
 #'   - No uncommitted changes
 #'   - No pre-existing `origin` remote
 #' * Creates an associated repo on GitHub
 #' * Adds that GitHub repo to your local repo as the `origin` remote
 #' * Makes an initial push to GitHub
 #' * Calls [use_github_links()], if the project is an R package
 #' * Configures `origin/DEFAULT` to be the upstream branch of the local
-#'   `DEFAULT` branch, e.g. `master` or `main`
+#'   `DEFAULT` branch, e.g. `main` or `master`
 #'
 #' See below for the authentication setup that is necessary for all of this to
 #' work.

R/utils-git.R

@@ -241,7 +241,7 @@ git_pull <- function(remref = NULL, verbose = TRUE) {
     verbose = FALSE
   )
   # this is pretty brittle, because I've hard-wired these messages
-  # https://github.com/r-lib/gert/blob/master/R/merge.R
+  # https://github.com/r-lib/gert/blob/main/R/merge.R
   # but at time of writing, git_merge() offers no verbosity control
   gert_shush(
     regexp = c(
@@ -323,7 +323,7 @@ check_current_branch <- function(is = NULL, is_not = NULL,
   invisible()
 }
 
-# examples of remref: upstream/master, origin/foofy
+# examples of remref: upstream/main, origin/foofy
 check_branch_up_to_date <- function(direction = c("pull", "push"),
                                     remref = NULL,
                                     use = NULL) {

README.Rmd

@@ -17,7 +17,7 @@ knitr::opts_chunk$set(
 
 <!-- badges: start -->
 [![R-CMD-check](https://github.com/r-lib/usethis/workflows/R-CMD-check/badge.svg)](https://github.com/r-lib/usethis/actions)
-[![Codecov test coverage](https://codecov.io/gh/r-lib/usethis/branch/master/graph/badge.svg)](https://app.codecov.io/gh/r-lib/usethis?branch=master)
+[![Codecov test coverage](https://codecov.io/gh/r-lib/usethis/branch/main/graph/badge.svg)](https://app.codecov.io/gh/r-lib/usethis?branch=main)
 [![CRAN status](https://www.r-pkg.org/badges/version/usethis)](https://CRAN.R-project.org/package=usethis)
 [![Lifecycle: stable](https://img.shields.io/badge/lifecycle-stable-brightgreen.svg)](https://lifecycle.r-lib.org/articles/stages.html#stable)
 <!-- badges: end -->

README.md

@@ -7,7 +7,7 @@
 
 [![R-CMD-check](https://github.com/r-lib/usethis/workflows/R-CMD-check/badge.svg)](https://github.com/r-lib/usethis/actions)
 [![Codecov test
-coverage](https://codecov.io/gh/r-lib/usethis/branch/master/graph/badge.svg)](https://app.codecov.io/gh/r-lib/usethis?branch=master)
+coverage](https://codecov.io/gh/r-lib/usethis/branch/main/graph/badge.svg)](https://app.codecov.io/gh/r-lib/usethis?branch=main)
 [![CRAN
 status](https://www.r-pkg.org/badges/version/usethis)](https://CRAN.R-project.org/package=usethis)
 [![Lifecycle: