Workflow

https://stackoverflow.com/questions/3689838/whats-the-difference-between-head-working-tree-and-index-in-git

cat .git/HEAD       # current branch head
    ref: refs/heads/master
cat .git/ORIG_HEAD | xargs git show  # prevous state of HEAD

working tree don't include untracked files

commit

git commit -am "save arezzo files"
git commit --amend
    -c, --reedit-message <commit>   # reuse and edit message from specified commit
    -C, --reuse-message <commit>    # reuse message from specified commit

log

git log [<options>] [<revision-range>] [[--] <path>...]
git show [<options>] <object>...
git show [path] # details of last commit log
git log --since=2.weeks

branch and merge

git branch -a       # list all
git checkout -b dev # create and checkout a new branch
git checkout dev

git merge master
    --squash              create a single commit instead of doing a merge
    --abort               abort the current in-progress merge

Undo

https://www.atlassian.com/git/tutorials/resetting-checking-out-and-reverting

git checkout -- <file>    # discard changes in working directory

git reset HEAD~2    # undo 2 changes that haven’t been shared
git reset <paths>   # opposite of `git add <paths>`
    --soft                reset HEAD only
    --mixed               reset HEAD and index (default)
    --hard                reset HEAD, index and working tree
    --merge               reset HEAD, index and working tree
    --keep                reset HEAD but keep local changes

git revert HEAD~2   # undo 2 changes on a public branch

https://stackoverflow.com/questions/3639342

git reset master
git checkout master

stashing

git stash
git stash list
git stash apply/pop
git stash apply [email protected]{2}
git stash drop
git stash drop [email protected]{0}

remote and push

https://git-scm.com/book/en/v2/Git-Internals-The-Refspec

git remote -v
git remote add [<options>] <name> <url>
    -f, --fetch           fetch the remote branches
    --tags
    --no-tags
    -t, --track <branch>        # branch(es) to track
    -m, --master <branch>
    --mirror[=<push|fetch>]     # set up remote as a mirro

cat .git/config
    `refspec`:     +<src>:<dst>
    <src> is the pattern for references on the remote side
    <dst> is where those references will be tracked locally

    [remote "origin"]
        fetch = +refs/heads/*:refs/remotes/origin/*
        fetch = +refs/heads/master:refs/remotes/origin/master
        fetch = +refs/heads/foo/*:refs/remotes/origin/foo/*

git push -u origin master:refs/heads/foo/master

        push = refs/heads/master:refs/heads/qa/master

tree .git/refs/
    .git/refs/
    ├── heads
    │   ├── dev
    │   └── master
    ├── remotes
    │   └── origin
    │       └── HEAD
    └── tags

git push [<options>] [<repository> [<refspec>...]]
    -u, --set-upstream    set upstream for git pull/status
git pull origin master # fetch + merge

delete remote branch

git push origin :topic
git push origin --delete topic

config

git config -l
    --global              ~/.gitconfig
    --local               .git/config
        core.repositoryformatversion=0
        core.filemode=true
        core.bare=false
        core.logallrefupdates=true
    --system              /etc/gitconfig

    --get                 get value: name [value-regex]
    --get-all             get all values: key [value-regex]
    --get-regexp          get values for regexp: name-regex [value-regex]
    --get-urlmatch        get value specific for the URL: section[.var] URL
    --replace-all         replace all matching variables: name value [value_regex]
    --add                 add a new variable: name value
    --unset               remove a variable: name [value-regex]
    --unset-all           remove all matches: name [value-regex]

filter-branch

https://manishearth.github.io/blog/2017/03/05/understanding-git-filter-branch/

[--setup <command>] 
[--env-filter <command>]
[--tree-filter <command>] 
[--index-filter <command>]
[--parent-filter <command>] 
[--msg-filter <command>]
[--commit-filter <command>] 
[--tag-name-filter <command>]
[--subdirectory-filter <directory>] 
[--original <namespace>]
[-d <directory>] [-f | --force] [--] [<rev-list options>...]

Remove File

Unpushed commit

git rm --cached giant_file # leave it on disk
git commit --amend -CHEAD

Every commit

git filter-branch --tree-filter 'rm -f filename' HEAD
    --all       # all branches

git filter-branch --index-filter \
    'git rm --cached --ignore-unmatch filename' HEAD

from Github

https://help.github.com/articles/removing-sensitive-data-from-a-repository/

rebase

https://git-scm.com/book/en/v2/Git-Branching-Rebasing

git remote add upstream https://github.com/yeasy/docker_practice
git fetch upstream
git checkout master
git rebase upstream/master
git push -f origin master

Submodules

https://git-scm.com/book/en/v2/Git-Tools-Submodules
treat the two projects as separate yet still be able to use one from within the other.

Github API

https://developer.github.com/v3/repos/

Download by tag

curl -sSL https://api.github.com/repos/django/django/tags \
    | jq '.[0].zipball_url' | xargs -t wget -O file.zip

curl Github

https://github.com/settings/tokens

curl -H 'Authorization: token INSERT_ACCESS_TOKEN_HERE' \
    -H 'Accept: application/vnd.github.v3.raw' -O -L \
    https://api.github.com/repos/owner/repo/contents/path

Query latest release

curl -sSL https://api.github.com/repos/ParsePlatform/Parse-SDK-Android/releases/latest \
    | jq '.zipball_url' | xargs -t wget -O file.zip

Cheatsheet

https://www.atlassian.com/dam/jcr:8132028b-024f-4b6b-953e-e68fcce0c5fa/atlassian-git-cheatsheet.pdf

Tools

curl -L https://github.com...?raw=true
.html to page, etc: https://rawgit.com/
.js CDN: https://cdnjs.com/ https://cdn.jsdelivr.net/gh/user/[email protected]/file
.ipynb fast open: http://nbviewer.jupyter.org/

Gitbook

https://toolchain.gitbook.com/structure.html

book.json
    {
        "root": "./docs"
    }

LANGS.md    # https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes
    * [English](en/)
    * [Chinese](zh/)

Code search

https://about.sourcegraph.com/

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