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<!DOCTYPE html><html lang="en-US"><head><title>Project management 2. Git continued</title><meta property="og:title" content="Project management 2. Git continued"><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear}body[data-bespoke-view=""] 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/*!
* Marp default theme.
*
* @theme default
* @author Yuki Hattori
*
* @auto-scaling true
* @size 16:9 1280px 720px
* @size 4:3 960px 720px
*/div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section 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:is(pre,marp-pre) :where(.hljs-comment),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-formula){color:var(--color-prettylights-syntax-comment)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-name),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-quote),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-pseudo),div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-selector-tag){color:var(--color-prettylights-syntax-entity-tag)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-subst){color:var(--color-prettylights-syntax-storage-modifier-import)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-section){color:var(--color-prettylights-syntax-markup-heading);font-weight:700}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-bullet){color:var(--color-prettylights-syntax-markup-list)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-emphasis){color:var(--color-prettylights-syntax-markup-italic);font-style:italic}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-strong){color:var(--color-prettylights-syntax-markup-bold);font-weight:700}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-addition){background-color:var(--color-prettylights-syntax-markup-inserted-bg);color:var(--color-prettylights-syntax-markup-inserted-text)}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre) :where(.hljs-deletion){background-color:var(--color-prettylights-syntax-markup-deleted-bg);color:var(--color-prettylights-syntax-markup-deleted-text)}div#\:\$p>svg>foreignObject>section footer,div#\:\$p>svg>foreignObject>section header{color:var(--header-footer-color);font-size:18px;left:30px;margin:0;position:absolute}div#\:\$p>svg>foreignObject>section header{top:21px}div#\:\$p>svg>foreignObject>section footer{bottom:21px}div#\:\$p>svg>foreignObject>section{--h1-color:#246;--header-footer-color:hsla(0,0%,40%,.75);--heading-strong-color:#48c;--paginate-color:#777;align-items:stretch;display:flex;flex-flow:column nowrap;font-size:29px;height:720px;justify-content:center;padding:78.5px;width:1280px}div#\:\$p>svg>foreignObject>section{--marpit-root-font-size:29px}div#\:\$p>svg>foreignObject>section:where(.invert){--h1-color:#cee7ff;--header-footer-color:hsla(0,0%,60%,.75);--heading-strong-color:#7bf;--paginate-color:#999}div#\:\$p>svg>foreignObject>section>:last-child,div#\:\$p>svg>foreignObject>section[data-footer]>:nth-last-child(2){margin-bottom:0}div#\:\$p>svg>foreignObject>section>:first-child,div#\:\$p>svg>foreignObject>section>header:first-child+*{margin-top:0}div#\:\$p>svg>foreignObject>section:after{bottom:21px;color:var(--paginate-color);font-size:24px;padding:0;position:absolute;right:30px}div#\:\$p>svg>foreignObject>section:after{--marpit-root-font-size:24px}div#\:\$p>svg>foreignObject>section[data-color] :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section[data-color] :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section[data-color] 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class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h1 id="project-management-2-git-continued">Project management 2. Git continued</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:3;--marpit-advanced-background-split:30%;" data-marpit-pagination-total="28" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("imgs/git-branches.png");background-size:60%;"><figcaption>width:</figcaption></figure></div></section></foreignObject><foreignObject width="70%" height="720"><section id="2" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:3;--marpit-advanced-background-split:30%;" data-marpit-pagination-total="28" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h2 id="branches">Branches</h2>
<ul>
<li data-marpit-fragment="1">A Git repository can have multiple <em><strong>branches</strong></em></li>
<li data-marpit-fragment="2">By default, a Git repository has only one branch
<ul>
<li data-marpit-fragment="3">named either <code>master</code> or <code>main</code></li>
</ul>
</li>
<li data-marpit-fragment="4">Using multiple branches makes it possible to work on new features step by step in their own <em><strong>feature branches</strong></em>
<ul>
<li data-marpit-fragment="5">Meanwhile, the <code>master</code> branch is kept clean and in a working state</li>
<li data-marpit-fragment="6">Only when the feature is completed, the branch is merged into the <code>master</code> branch!</li>
</ul>
</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="2" style="" data-marpit-pagination-total="28" data-marpit-advanced-background="pseudo" data-marpit-advanced-background-split="right"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h3 id="active-branch">Active branch</h3>
<ul>
<li data-marpit-fragment="1">Even though your local repository can have multiple branches, only one of them is <em>active</em> at a given time</li>
<li data-marpit-fragment="2"><code>git status</code> tells you firsthand which branch you are on: <code>On branch master</code></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="git-branch--git-checkout"><code>git branch</code> & <code>git checkout</code></h2>
<ul>
<li data-marpit-fragment="1">You can create a new branch with <code>git branch <branchName></code>
<ul>
<li data-marpit-fragment="2">The new branch is not empty: it contains a copy of the code of the branch you executed this command in</li>
</ul>
</li>
<li data-marpit-fragment="3"><em><strong>Note:</strong></em> <code>git branch <branchName></code> does not make the branch active!</li>
<li data-marpit-fragment="4">To make the branch active, a.k.a "move" to the branch:
<ul>
<li data-marpit-fragment="5"><code>git checkout <branchName></code>.</li>
<li data-marpit-fragment="6">For example, to move back to master use <code>git checkout master</code></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h3 id="local-vs-remote-branches">Local vs. remote branches</h3>
<ul>
<li data-marpit-fragment="1"><code>git branch <branchName></code> only creates a local branch</li>
<li data-marpit-fragment="2">When you try to push changes from a new local branch, Git nags you that a matching remote branch doesn't yet exist
<ul>
<li data-marpit-fragment="3">Git tells you how to create the remote branch:
<ul>
<li data-marpit-fragment="4"><code>git push --set-upstream origin <newBranch></code></li>
<li data-marpit-fragment="5">Afterwards, <code>git push</code> pushes the changes to the matching remote branch</li>
</ul>
</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h3 id="extra-branch-commands">Extra branch commands</h3>
<ul>
<li data-marpit-fragment="1">Handy command: <code>git checkout -b <branchName></code>
<ul>
<li data-marpit-fragment="2">It's a shorthand for <code>git branch <branchName></code> + <code>git checkout <branchName></code></li>
</ul>
</li>
<li data-marpit-fragment="3">Get a list of local branches with <code>git branch</code>
<ul>
<li data-marpit-fragment="4">...and all branches (incl. the remote ones) with <code>git branch -a</code></li>
</ul>
</li>
<li data-marpit-fragment="5">Delete a local branch with <code>git branch -d <branchName></code>
<ul>
<li data-marpit-fragment="6">Remote branch can be deleted in the GitHub/etc website</li>
<li data-marpit-fragment="7">...or with <code>git push origin -d <branchName></code></li>
<li data-marpit-fragment="8"><em><strong>Note:</strong></em> If deleted remote branches still show up in <code>git branch -a</code>, you can use the command <code>git remote prune origin</code> to remove them from the list.</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="7" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="git-merge"><code>git merge</code></h2>
<ul>
<li data-marpit-fragment="1">So you've been working on a feature branch. What next?</li>
<li data-marpit-fragment="2">When the feature is done (and all the broken things fixed), you want to apply your changes back to <code>master</code></li>
<li data-marpit-fragment="3">For this, we use <code>git merge <branchToMerge></code>
<ul>
<li data-marpit-fragment="4">It applies changes from <code><branchToMerge></code> to the <em><strong>current active branch</strong></em></li>
</ul>
</li>
<li data-marpit-fragment="5"><code>master</code> branch is usually (and should be) protected, so we can't merge our new code to <code>master</code> directly</li>
<li data-marpit-fragment="6">Instead, we do the <em>inverse</em>.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="8" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="merging-with-a-pull-request">Merging with a pull request</h2>
<ol>
<li data-marpit-fragment="1">Make sure you have the newest version of the <code>master</code> branch:</li>
</ol>
<ul>
<li data-marpit-fragment="2">Checkout <code>master</code> branch</li>
<li data-marpit-fragment="3">Pull changes from GitHub/etc</li>
<li data-marpit-fragment="4">Checkout the feature branch</li>
<li data-marpit-fragment="5">Merge the contents of <code>master</code> to <code>featureBranch</code> with <code>git merge master</code></li>
</ul>
<ol start="2">
<li data-marpit-fragment="6">Then, create a <em><strong>pull request</strong></em> on GitHub/etc (In GitLab, it's called <em><strong>merge request</strong></em>!)</li>
</ol>
<ul>
<li data-marpit-fragment="7">This creates a formal process for merging your <em>remote</em> feature branch to remote <code>master</code></li>
<li data-marpit-fragment="8">This adds a layer of protection to the <code>master</code> branch: no direct merging!</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<p><img src="imgs/github-pullreq.png" alt="" /></p>
<ul>
<li data-marpit-fragment="1">UI of a new pull request (<em>Pull requests > New pull request</em>) can be confusing...
<ul>
<li data-marpit-fragment="2"><em>base</em> is the branch you're merging, <em>compare</em> is the branch you're merging into!</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h3 id="if-automatic-merge-fails">If automatic merge fails...</h3>
<ol>
<li data-marpit-fragment="1">Pull remote changes to your local <code>master</code>.
<ul>
<li data-marpit-fragment="2"><em><strong>Pro tip:</strong></em> If you're on your feature branch, you can do this quickly without changing branches with<br />
<code>git fetch origin master:master</code></li>
</ul>
</li>
<li data-marpit-fragment="3">Merge changes from <code>master</code> to your local feature branch.</li>
<li data-marpit-fragment="4">Fix the ensuing <em><strong>conflicts</strong></em> (see <a href="#3-conflicts">next section</a>)</li>
<li data-marpit-fragment="5">Push your new local branch to GitHub/etc</li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="28">
<h2 id="extra-merging-without-a-pull-request">Extra: Merging without a pull request</h2>
<ol>
<li data-marpit-fragment="1">First, checkout the <code>master</code> branch with <code>git checkout master</code></li>
<li data-marpit-fragment="2">Then, do a <code>git pull</code> so you have the newest version of the <code>master</code> branch
<ul>
<li data-marpit-fragment="3">Someone else might have done changes to it while you were working on your feature!</li>
</ul>
</li>
<li data-marpit-fragment="4">Then, merge <code><featureBranch></code> to <code>master</code> with <code>git merge <featureBranch></code>
<ul>
<li data-marpit-fragment="5">Fix conflicts</li>
</ul>
</li>
</ol>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="12" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="28">
<h2 id="exercise-1-pushing-onwards">Exercise 1. Pushing onwards</h2>
<p>Continue the exercise from <a href="1-git-basics">Git Basics</a> or create a new repository for these exercises.</p>
<ul>
<li data-marpit-fragment="1">Create a new branch (with a name <code>new-feature</code>, for instance) in your local repository.</li>
<li data-marpit-fragment="2">Checkout the branch, make some changes to <code>GitTest.md</code> there, and push the changes to GitHub.</li>
<li data-marpit-fragment="3">Then, merge the changes from your <code>new-feature</code> branch to <code>master</code> branch by using<br />
a) pull request in GitHub<br />
b) <code>git merge</code> from command line</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-marpit-fragments="11" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="gitlens">GitLens</h2>
<ul>
<li data-marpit-fragment="1">To make the Git workflow easier, install the GitLens extension to VS code
<ul>
<li data-marpit-fragment="2">It helps in managing conflicts, comparing branches or commits</li>
</ul>
</li>
<li data-marpit-fragment="3">Install it from the Extensions panel (access with <em><strong>CTRL+SHIFT+X</strong></em>)</li>
<li data-marpit-fragment="4">Adds many new views to the source control tab:
<ul>
<li data-marpit-fragment="5">Commits</li>
<li data-marpit-fragment="6">Repositories</li>
<li data-marpit-fragment="7">File History</li>
<li data-marpit-fragment="8">Line History</li>
<li data-marpit-fragment="9">Branches</li>
<li data-marpit-fragment="10">Remotes</li>
<li data-marpit-fragment="11">etc...</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="14" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h1 id="3-conflicts">3. Conflicts</h1>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="15" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="conflicts">Conflicts</h2>
<ul>
<li data-marpit-fragment="1">Sometimes two people have made changes in the same lines of code!
<ul>
<li data-marpit-fragment="2">This leads to a conflict.</li>
</ul>
</li>
<li data-marpit-fragment="3">Let's assume we're trying to merge changes from featureBranch to master.</li>
<li data-marpit-fragment="4">If a conflict happens, the merge does not conclude automatically. Instead, we need to <em><strong>fix all the conflicts</strong></em> by hand and then <em><strong>conclude the merge</strong></em> with some commands.</li>
<li data-marpit-fragment="5">Conflicting lines of code are framed by some <code><<<<<<< garbage ======= symbols >>>>>>></code> we don't yet understand</li>
<li data-marpit-fragment="6">Before we can conclude the merge, we need to get rid of the garbage.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="16" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h3 id="said-garbage">Said garbage</h3>
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-c#"><<<<<<< HEAD:Player.<span class="hljs-function">cs
<span class="hljs-title">if</span> (<span class="hljs-params">Input.anyKey</span>)</span> {
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
}
=======
<span class="hljs-keyword">if</span> (Input.anyKey)
<span class="hljs-keyword">return</span> <span class="hljs-literal">true</span>;
>>>>>>> featureBranch:Player.cs
</code></pre>
<ul>
<li data-marpit-fragment="1"><em><strong>Current change</strong></em> is between <code><<<<<<<</code> and <code>=======</code>: old code in <code>master</code></li>
<li data-marpit-fragment="2"><em><strong>Incoming change</strong></em> is between <code>>>>>>>></code> and <code>=======</code>: new code from <code>featureBranch</code></li>
<li data-marpit-fragment="3">Use your text editor to choose which (or some combination of both) you want to preserve</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="17" style="--paginate:true;--class:invert;--heading-divider:3;--marpit-advanced-background-split:50%;" data-marpit-pagination-total="28" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("imgs/vscode-conflicts.png");background-size:95% auto;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="17" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="17" style="--paginate:true;--class:invert;--heading-divider:3;--marpit-advanced-background-split:50%;" data-marpit-pagination-total="28" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h3 id="vs-code-tools">VS Code tools</h3>
<ul>
<li data-marpit-fragment="1">VS Code gives us tools to make conflict resolution a quick process</li>
<li data-marpit-fragment="2">Click which lines of code you want to preserve:
<ul>
<li data-marpit-fragment="3"><em><strong>Accept Current Change</strong></em> (old code is preserved, new code removed)</li>
<li data-marpit-fragment="4"><em><strong>Accept Incoming Change</strong></em> (new code is preserved, old code removed)</li>
<li data-marpit-fragment="5"><em><strong>Accept Both Changes</strong></em> (both are preserved)</li>
</ul>
</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="17" style="" data-marpit-pagination-total="28" data-marpit-advanced-background="pseudo" data-marpit-advanced-background-split="right"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-footer="If VS code is not configured properly as Git's text editor, and you encounter an error, run `git config core.editor code --wait`" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="18" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="after-resolving-the-conflict">After resolving the conflict</h2>
<ul>
<li data-marpit-fragment="1">After resolving conflicting files, use <code>git add <filename></code> to add them to the commit</li>
<li data-marpit-fragment="2">Then use <code>git commit</code> to apply changes (without a message! no <code>-m</code>)
<ul>
<li data-marpit-fragment="3">Close the automatically opened <code>COMMITMSG</code> file. This should finish the merge.</li>
</ul>
</li>
<li data-marpit-fragment="4">Then just <code>git push</code> to apply changes in the remote repository</li>
</ul>
<footer>If VS code is not configured properly as Git's text editor, and you encounter an error, run <code>git config core.editor code --wait</code></footer>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="19" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="28">
<h2 id="exercise-2-fixing-conflicts">Exercise 2. Fixing conflicts</h2>
<ul>
<li data-marpit-fragment="1">Create a new branch in your local repository, but do not checkout it just yet.</li>
<li data-marpit-fragment="2">First, we simulate your teammate's changes by making changes to the <code>master</code> branch directly:
<ul>
<li data-marpit-fragment="3">On the <code>master</code> branch, make some changes to <code>GitTest.md</code>, and <strong>add & commit</strong>.</li>
</ul>
</li>
<li data-marpit-fragment="4">Then, checkout the new feature branch.
<ul>
<li data-marpit-fragment="5">Then, make some other changes to GitTest.md to the same line as before, <strong>add & commit</strong>.</li>
<li data-marpit-fragment="6">Then, merge the changes from the <code>master</code> branch to your feature branch by using <code>git merge</code></li>
<li data-marpit-fragment="7">Fix the ensuing conflicts, add & commit & push.</li>
</ul>
</li>
<li data-marpit-fragment="8">Now you can create a pull request to merge your changes to the master branch.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="20" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="git-workflow-3-undoing">Git workflow 3: Undoing</h2>
<ul>
<li data-marpit-fragment="1">Git doesn't have a general "undo" command</li>
<li data-marpit-fragment="2">If you make a mistake, it is very case-specific what you need to do to fix it
<ul>
<li data-marpit-fragment="3">See <a href="https://docs.gitlab.com/ee/topics/git/numerous_undo_possibilities_in_git/">undo options here</a></li>
<li data-marpit-fragment="4">Also, <a href="https://ohshitgit.com/">ohshitgit.com</a></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-marpit-fragments="7" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="git-log--git-checkout-hashcode"><code>git log</code> & <code>git checkout <hashcode></code></h2>
<ul>
<li data-marpit-fragment="1">
<p>Use <code>git log</code> to see the commit history</p>
<ul>
<li data-marpit-fragment="2">Or <code>git log --oneline</code> for a more concise version</li>
<li data-marpit-fragment="3">Press <em><strong>Q</strong></em> to quit the log view.</li>
<li data-marpit-fragment="4">The newest changes are seen on top</li>
<li data-marpit-fragment="5">On the left side of the commit message you see the <em><strong>hashcode</strong></em> of the commit</li>
<li data-marpit-fragment="6">Use <code>git checkout <hashcode></code> to "time travel" into the commit</li>
</ul>
</li>
<li data-marpit-fragment="7">
<p><em><strong>Note:</strong></em> If you have GitLens, check the Commits view in the Source control tab to see the commit history.</p>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="22" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="revert-one-file-to-a-previous-state">Revert one file to a previous state</h2>
<ul>
<li data-marpit-fragment="1">Sometimes you want to revert just one file to its previous state</li>
<li data-marpit-fragment="2">For that, you need to figure out the commit hash of the state you want to return to</li>
<li data-marpit-fragment="3">Find that out in one of the following methods:
<ul>
<li data-marpit-fragment="4"><code>git log --oneline</code></li>
<li data-marpit-fragment="5">VS Code: <em>Source control > File history</em></li>
<li data-marpit-fragment="6">GitHub: check commits</li>
</ul>
</li>
<li data-marpit-fragment="7">Then, run
<ul>
<li data-marpit-fragment="8"><code>git checkout <commit-hash> -- <filename></code></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-marpit-fragments="7" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="23" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="collaboration-in-unity">Collaboration in Unity</h2>
<ul>
<li data-marpit-fragment="1"><em><strong>The zeroth rule:</strong></em> Make sure that everyone on team uses the same Unity and package versions.</li>
<li data-marpit-fragment="2"><em><strong>The first rule:</strong></em> Don't ever work on the same thing simultaneously.</li>
<li data-marpit-fragment="3"><em><strong>The second rule:</strong></em> When you do break rule #1, make necessary changes in communication so you won't break it again.</li>
<li data-marpit-fragment="4">Be sure to communicate about <em><strong>scene ownership</strong></em>
<ul>
<li data-marpit-fragment="5">Scenes are not code files, so you can't easily merge changes if two people have worked on them</li>
<li data-marpit-fragment="6">Thus, the <em><strong>Scene Owner</strong></em> will be the only person on the team who should be working on a certain scene</li>
<li data-marpit-fragment="7">If a scene needs GameObject contributions from others, they can create prefabs that the Scene Owners then add to their scene</li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="24" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="24" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="28">
<h2 id="exercise-3-branching-team-effort">Exercise 3. Branching team effort</h2>
<ul>
<li data-marpit-fragment="1">Work as a group for this assignment.</li>
<li data-marpit-fragment="2">Continue Exercise 2 from <a href="1-git-basics">Git basics</a>.</li>
<li data-marpit-fragment="3">Every group member creates an individual branch from the master, and makes some changes to the <code>GitTest.md</code> file.</li>
<li data-marpit-fragment="4">Add new files as well, at least one per group member.</li>
<li data-marpit-fragment="5">Do not tell other group members what you're going to change! :D</li>
<li data-marpit-fragment="6">Then, merge the changes back to the master branch. Fix ensuing conflicts, if any appear.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-background-color="#29366f" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="25" style="--paginate:true;--class:invert;--background-color:#29366f;--heading-divider:3;background-color:#29366f;background-image:none;" data-marpit-pagination-total="28">
<h2 id="exercise-4-unity-collaboration">Exercise 4. Unity collaboration</h2>
<p>Create a new Unity project for your group.</p>
<p>Every group member creates their own scene and works on that (i.e., is the Scene Owner of the scne).</p>
<p>The scene can contain anything you like; the only mandatory feature is that pressing the A button (Fire1) should make the game continue on to the next scene.</p>
<p>From Scene 4, the game should loop back to Scene 1.</p>
<ul>
<li data-marpit-fragment="1"><em><strong>Extra:</strong></em> Create a prefab that is included in every scene.</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-marpit-fragments="3" data-paginate="true" data-class="invert" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="26" style="--paginate:true;--class:invert;--heading-divider:3;" data-marpit-pagination-total="28">
<h2 id="reading">Reading</h2>
<ul>
<li data-marpit-fragment="1"><a href="https://git-scm.com/book/en/v2">Pro Git book</a></li>
<li data-marpit-fragment="2"><a href="https://ohshitgit.com/">Oh shit Git</a></li>
<li data-marpit-fragment="3"><a href="https://docs.gitlab.com/ee/topics/git/numerous_undo_possibilities_in_git/">Undo possibilities</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="27" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="27" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="28">
<h2 id="very-extra-git-rebase">Very extra: <code>git rebase</code></h2>
<ul>
<li data-marpit-fragment="1"><code>git merge</code> creates a new commit for the merge process</li>
<li data-marpit-fragment="2">Sometimes that's undesirable, so an alternative is to use <code>git rebase</code></li>
<li data-marpit-fragment="3">Unlike merge, rebase applies changes from the rebased branch <em><strong>one commit at a time</strong></em></li>
<li data-marpit-fragment="4">Whenever there's a conflict:</li>
</ul>
<ol>
<li data-marpit-fragment="5">After fixing the conflict, add the conflicting file with <code>git add <filename></code></li>
<li data-marpit-fragment="6">Then continue the rebase process with <code>git rebase --continue</code></li>
<li data-marpit-fragment="7">If you want to disregard a conflicting commit, use <code>git rebase --skip</code></li>
<li data-marpit-fragment="8">If you get cold feet, you can cancel the rebase with <code>git rebase --abort</code></li>
</ol>
<ul>
<li data-marpit-fragment="9"><em><strong>Note:</strong></em> A good link for <a href="https://borbware.github.io/unity-basics-course/project-management/2-git-continued-slides.html">understanding rebase</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="28" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-background-color="#5d275d" data-heading-divider="3" lang="en-US" class="invert" data-marpit-pagination="28" style="--paginate:true;--class:invert;--background-color:#5d275d;--heading-divider:3;background-color:#5d275d;background-image:none;" data-marpit-pagination-total="28">
<h2 id="very-very-extra-submodules">Very very extra: submodules</h2>
<ul>
<li data-marpit-fragment="1">To add external code to your project from someone else's repository, Git has a neat system called <em>submodules</em></li>
<li data-marpit-fragment="2">To add a submodule to your project, use <code>git submodule add <submodule-url> <folder></code></li>
<li data-marpit-fragment="3">To remove a submodule, use <code>git rm <path-to-submodule></code></li>
<li data-marpit-fragment="4">If you clone a project with submodules, you need to run <code>git submodule update --init --recursive</code> once.</li>
<li data-marpit-fragment="5"><em><strong>Note:</strong></em> If you don't want submodules to appear in the Source control tab of VS Code, go to settings and disable the <em>Git: Detect Submodules</em> setting.</li>
</ul>
</section>
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