Merge 295fe153ad into e0db60f6ce

README.md

@@ -10,7 +10,7 @@ pairing with smart people at Hashrocket.
 
 For a steady stream of TILs, [sign up for my newsletter](https://crafty-builder-6996.ck.page/e169c61186).
 
-_1517 TILs and counting..._
+_1519 TILs and counting..._
 
 ---
 
@@ -41,6 +41,7 @@ _1517 TILs and counting..._
 * [Internet](#internet)
 * [Java](#java)
 * [JavaScript](#javascript)
+* [jj](#jj)
 * [jq](#jq)
 * [Kitty](#kitty)
 * [Linux](#linux)
@@ -569,6 +570,10 @@ _1517 TILs and counting..._
 - [Yarn Commands Without The Emojis](javascript/yarn-commands-without-the-emojis.md)
 - [Yup Schemas Are Validated Asynchronously](javascript/yup-schemas-are-validated-asynchronously.md)
 
+### jj
+
+- [Colocate jj And git Directories For Project](jj/colocate-jj-and-git-directories-for-project.md)
+
 ### jq
 
 - [Combine An Array Of Objects Into A Single Object](jq/combine-an-array-of-objects-into-a-single-object.md)
@@ -1540,6 +1545,7 @@ _1517 TILs and counting..._
 - [Switch Versions of a Brew Formula](unix/switch-versions-of-a-brew-formula.md)
 - [Tell direnv To Load The Env File](unix/tell-direnv-to-load-the-env-file.md)
 - [Touch Access And Modify Times Individually](unix/touch-access-and-modify-times-individually.md)
+- [Type Fewer Paths With Brace Expansion](unix/type-fewer-paths-with-brace-expansion.md)
 - [Undo Changes Made To Current Terminal Prompt](unix/undo-changes-made-to-current-terminal-prompt.md)
 - [Undo Some Command Line Editing](unix/undo-some-command-line-editing.md)
 - [Unrestrict Where ripgrep Searches](unix/unrestrict-where-ripgrep-searches.md)

jj/colocate-jj-and-git-directories-for-project.md

@@ -0,0 +1,59 @@
+# Colocate jj And git Directories For Project
+
+When doing a standard clone of a git repository with `jj`, you'll get a copy of
+the project with a `.jj` directory containing the version control information.
+
+```bash
+$ jj git clone git@github.com:jbranchaud/my-repo
+Fetching into new repo in "/path/of/local/repo"
+...
+
+$ exa --tree --all -L 1
+.
+├── .gitignore
+├── .jj
+├── Cargo.lock
+├── Cargo.toml
+└── src
+```
+
+This is fine if I'm completely familiar with using
+[jujutsu](https://martinvonz.github.io/jj/latest/). However, if I'm coming from
+`git` and still learning, then it would be nice to be able to fallback to
+familiar `git` commands when needed.
+
+But without a `.git` directory, I get this:
+
+```bash
+$ git log
+fatal: not a git repository (or any of the parent directories): .git
+```
+
+When cloning a git repo with `jj`, I can instruct it to _colocate_ which means
+that it will create both the `.jj` and the `.git` data directories in the
+project.
+
+```bash
+$ jj git clone --colocate git@github.com:jbranchaud/my-repo
+Fetching into new repo in "/path/of/local/repo"
+...
+
+$ exa --tree --all -L 1
+.
+├── .git
+├── .gitignore
+├── .jj
+├── Cargo.lock
+├── Cargo.toml
+└── src
+```
+
+Now I can run `jj` commands or `git` commands:
+
+```bash
+$ git log
+commit 0c72abbb83657096677f9a3d5ddc7bce20839165 (HEAD, origin/trunk, trunk)
+...
+```
+
+[source](https://martinvonz.github.io/jj/latest/git-compatibility/#co-located-jujutsugit-repos)

unix/type-fewer-paths-with-brace-expansion.md

@@ -0,0 +1,49 @@
+# Type Fewer Paths With Brace Expansion
+
+Bash has a feature called _brace expansion_ that allows us to do a kind of
+shorthand when writing out file paths. We can specify multiple variants
+comma-separated between curly braces and they'll each be expanded into separate
+arguments.
+
+It's easier to understand this by seeing it. If we type the following (don't
+hit `Enter` yet):
+
+```bash
+$ mkdir src/{one,two,three}
+```
+
+And then hit _Tab_:
+
+```bash
+$ mkdir src/one src/two src/three
+```
+
+Bash uses the portion in braces to expand into separate arguments. The part
+outside the braces gets reused for each. That's where we get some savings from
+typing out the same path each time.
+
+Here is another example where we use `mv` to rename a file deeply nested in our
+project:
+
+```bash
+$ mv projects/project1/src/app/utils/{names,constants}.js
+```
+
+We don't even have to _Tab_ it out. We can hit _Enter_ directly and `mv` gets
+both arguments.
+
+Similarly, how about we change the extension of our renamed file:
+
+```bash
+$ mv projects/project1/src/app/utils/constants.{js,ts}
+```
+
+I've always found this feature most useful with paths and filenames, but you
+can do brace expansion with any arguments.
+
+```bash
+$ echo 1{3,1,6,4,9,2,7,5}
+13 11 16 14 19 12 17 15
+```
+
+[source](https://www.gnu.org/software/bash/manual/html_node/Brace-Expansion.html)