git_config: Get and set Git configuration variables
In jennybc/githug: Interface to local and remote Git operations

Description Usage Arguments Details Value Functions References Examples

git_config and convenience wrappers git_config_global and git_config_local can be used to get or set Git configuration. All rely on git2r::config().

git_config(..., where = c("de_facto", "local", "global"), repo = ".")

git_config_global(..., repo = ".")

git_config_local(..., repo = ".")

`...`	The Git configuration variables to get or set. If unspecified, all are returned, i.e. the output should match the result of `git config --list`.
`where`	Specifies which variables. The default, `de_facto`, applies only to a query and requests the variables in force, i.e. where local repo variables override global user-level variables, when both are defined. `local` or `global` narrows the scope to the associated configuration file: for `local`, `.git/config` in the targetted `repo`, and for `global`, `~/.gitconfig` in user's home directory. When setting, if `where` is unspecified, the local configuration is modified.
`repo`	Path to a Git repo. If unspecified, current working directory is checked to see if it is or is inside a Git repo.

Variables can be listed by specifying the names as strings or in a unnamed list or vector of strings. Don't specify anything if you want to see them all. Non-existent variables will return value NULL.

Variables can be set by specifying them as arguments in variable = value form or as a named list. To unset a variable, i.e. git config --unset, specify NULL as the value.

When variables are set, the previous values are returned in an invisible named list, analogous to par or setwd. Such a list can be passed back in to git_config_local or git_config_global to restore the previous configuration.

Consult the git-config man page for a long yet non-comprehensive list of variables.

For future GitHub happiness, it is highly recommended that you set user.email to an email address that is associated with your GitHub account: https://help.github.com/articles/setting-your-email-in-git/.

A named list of Git configuration variables, with class githug_list for pretty-printing purposes.

git_config_global: Get or set global Git config, a la git config --global
git_config_local: Get or set local Git config, a la git config --local

Getting Started - First-Time Git Setup from the Pro Git book by Scott Chacon and Ben Straub

Customizing Git - Git Configuration from the Pro Git book by Scott Chacon and Ben Straub

git-config man page

## see git config currently in effect, based on working directory
git_config()         # local > global, same as git_config(where = "de_facto")
git_config_local()   #                 same as git_config(where = "local")
git_config_global()  #                 same as git_config(where = "global")

## set and get global config
## Not run: 
## set and list global config
git_config_global(user.name = "thelma", user.email = "thelma@example.org")
git_config_global("user.name", "user.email")

## End(Not run)

## specify a Git repo
repo <- git_init(tempfile("githug-config-example-"))
git_config_local(repo = repo)

## switch working directory to the repo
owd <- setwd(repo)

## set local variables for current repo
git_config_local(user.name = "louise", user.email = "louise@example.org")

## get specific local variables, including a non-existent one
git_config_local("user.name", "color.branch", "user.email")

## set local variables, then restore
ocfg <- git_config_local(user.name = "oops", user.email = "oops@example.org")
git_config_local("user.name", "user.email")
git_config_local(ocfg)
git_config_local("user.name", "user.email")

## set a custom variable
ocfg <- git_config_local(githug.lol = "wut")
git_config_local("githug.lol")

setwd(owd)