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Showing content from https://github.com/syohex/emacs-git-gutter below:

emacsorphanage/git-gutter: Emacs port of GitGutter which is Sublime Text Plugin

git-gutter.el is an Emacs port of the Sublime Text plugin GitGutter.

• Asynchronous updating
• Live updating
• Support multiple VCS
• Support Tramp
• Work without vc-mode

• Emacs 25.1 or higher
• Git(1.7.0 or higher)

You can install git-gutter.el from MELPA with package.el (M-x package-install git-gutter), with el-get, or with another package manager of your choice

git-gutter.el provides a global minor-mode(global-git-gutter-mode) and minor-mode(git-gutter-mode).

If you want to use git-gutter for files in git repository. You add following s-exp in your configuration file(~/.emacs.d/init.el or ~/.emacs).

(global-git-gutter-mode +1)

Other case, you want to use git-gutter for some files, you can use git-gutter-mode. Following example of enabling git-gutter for some mode.

(add-hook 'ruby-mode-hook 'git-gutter-mode)
(add-hook 'python-mode-hook 'git-gutter-mode)

git-gutter.el provides following commands. Obsoleted interfaces will be removed when 1.0 released.

Jump to next hunk

Jump to previous hunk

Move to end of current hunk

Mark current hunk.

Set the start revision from which git-gutter performs the diffs.

You can also set the variable git-gutter:start-revision as a directory-local variable.

Popup current diff hunk(alias git-gutter:popup-diff)

git-gutter:next-hunk and git-gutter:previous-hunk update content of buffer popuped by git-gutter:popup-diff to current hunk.

Stage current hunk. You can use this command like git add -p. This command is supported only for git.

Revert current hunk

Show changes from last commit or Update change information. Please execute this command if diff information is not be updated.

Setup for working with linum-mode.

Update git-gutter information of buffers in all visible window.

(require 'git-gutter)

;; If you enable global minor mode
(global-git-gutter-mode t)

;; If you would like to use git-gutter.el and linum-mode
(git-gutter:linum-setup)

;; If you enable git-gutter-mode for some modes
(add-hook 'ruby-mode-hook 'git-gutter-mode)

(global-set-key (kbd "C-x C-g") 'git-gutter)
(global-set-key (kbd "C-x v =") 'git-gutter:popup-hunk)

;; Jump to next/previous hunk
(global-set-key (kbd "C-x p") 'git-gutter:previous-hunk)
(global-set-key (kbd "C-x n") 'git-gutter:next-hunk)

;; Stage current hunk
(global-set-key (kbd "C-x v s") 'git-gutter:stage-hunk)

;; Revert current hunk
(global-set-key (kbd "C-x v r") 'git-gutter:revert-hunk)

;; Mark current hunk
(global-set-key (kbd "C-x v SPC") #'git-gutter:mark-hunk)

Using directory-local variables, you can set the start revision for diffs for any file in the current directory:

;;; .dir-locals.el
((prog-mode . ((git-gutter:start-revision . "my-branch"))))

If you set git-gutter:update-interval seconds larger than 0, git-gutter updates diff information in real-time by idle timer.

(custom-set-variables
 '(git-gutter:update-interval 2))

You can stop timer by git-gutter:cancel-update-timer and starts by git-gutter:start-update-timer.

You can change the signs and those faces.

(custom-set-variables
 '(git-gutter:modified-sign "  ") ;; two space
 '(git-gutter:added-sign "++")    ;; multiple character is OK
 '(git-gutter:deleted-sign "--"))

(set-face-background 'git-gutter:modified "purple") ;; background color
(set-face-foreground 'git-gutter:added "green")
(set-face-foreground 'git-gutter:deleted "red")

You can change minor-mode name in mode-line to set git-gutter:lighter. Default is " GitGutter"

;; first character should be a space
(custom-set-variables
 '(git-gutter:lighter " GG"))

Emacs has char-width function which returns character width. git-gutter.el uses it for calculating character length of the signs. But char-width does not work for some full-width characters. So you should explicitly specify window width, if you use full-width character.

(custom-set-variables
 '(git-gutter:window-width 2)
 '(git-gutter:modified-sign "☁")
 '(git-gutter:added-sign "☀")
 '(git-gutter:deleted-sign "☂"))

git-gutter.el supports following version control systems

• Git(1.7.0 or higher)
• Mercurial
• Subversion(1.8 or higher)
• Bazaar

You can set backends which git-gutter.el will be used. Default value of git-gutter:handled-backends is '(git). If you want to use git-gutter.el for other VCS, please change value of git-gutter:handled-backends as below.

;; Use for 'Git'(`git`), 'Mercurial'(`hg`), 'Bazaar'(`bzr`), and 'Subversion'(`svn`) projects
(custom-set-variables
 '(git-gutter:handled-backends '(git hg bzr svn)))

diff information is updated at hooks in git-gutter:update-hooks.

(add-to-list 'git-gutter:update-hooks 'focus-in-hook)

diff information is updated after command in git-gutter:update-commands executed.

(add-to-list 'git-gutter:update-commands 'other-window)

If you use global-git-gutter-mode, you may want some modes to disable git-gutter-mode. You can make it by setting git-gutter:disabled-modes to non-nil.

;; inactivate git-gutter-mode in asm-mode and image-mode
(custom-set-variables
 '(git-gutter:disabled-modes '(asm-mode image-mode)))

Default is nil.

Emacs folds long line if truncate-lines is nil. If git-gutter:visual-line is non-nil, git-gutter puts sign by visual lines.

(custom-set-variables
 '(git-gutter:visual-line t))

Default bahavior is that signs are put by logical lines. value of git-gutter:visual-line is nil.

git-gutter.el can view unchanged information by setting git-gutter:unchanged-sign. Like following.

(custom-set-variables
 '(git-gutter:unchanged-sign " "))
(set-face-background 'git-gutter:unchanged "yellow")

Default value of git-gutter:unchanged-sign is nil.

git-gutter.el can display an additional separator character at the right of the changed signs. This is mostly useful when running emacs in a console.

(custom-set-variables
 '(git-gutter:separator-sign "|"))
(set-face-foreground 'git-gutter:separator "yellow")

Default value of git-gutter:separator-sign is nil.

Please set git-gutter:always-show-separator to non-nil, if you want to show separator always.

Hide gutter when there are no changes if git-gutter:hide-gutter is non-nil. (Default is nil)

(custom-set-variables
 '(git-gutter:hide-gutter t))

You can pass git diff option to set git-gutter:diff-option.

;; ignore all spaces
(custom-set-variables
 '(git-gutter:diff-option "-w"))

git-gutter.el always asks you whether commit/revert or not. If you don't want, please set git-gutter:ask-p to nil.

;; Don't ask me!!
(custom-set-variables
 '(git-gutter:ask-p nil))

;; Don't need log/message.
(custom-set-variables
 '(git-gutter:verbosity 0))

Default value is 4(0 is lowest, 4 is highest).

Run hook git-gutter-mode-on-hook when git-gutter-mode is turn on, and run hook git-gutter-mode-off-hook when git-gutter-mode is turn off.

git-gutter.el provides some statistic API. This is useful for knowing how much code you changed etc. To display them in mode-line is also useful.

Count unstaged hunks in current buffer.

Count unstaged hunks in all buffers

Return statistic unstaged hunks in current buffer. Return value is dot-list. First element is total added lines, second element is total deleted lines.

GitGutter is Sublime Text plugin.

Vim version of GitGutter

diff-hl is similar tool based on vc.

Fork of git-gutter.el. Some features which are not provided git-gutter.el provides. However git-gutter-plus updates diff information synchronously.

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