blog: Code Snippet: Count number of files with an extention

src/content/blog/2024-03-11-code-snippet-tree-grep.md

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+---
+title: 'Code Snippet: Count the number of files with an extention '
+date: 2024-03-11T21:09:52.651Z
+slug: 2024-03-11-code-snippet-tree-grep
+author: Thomas Wilson
+
+---
+I wanted to know how many files that ended in either `.test.ts` or `.test.js` in a directory, came up with this guy:
+
+```sh
+tree --noreport --gitignore -i | grep -c -E '\.test\.(js|ts)' 
+```
+
+## Tree
+
+[tree](https://formulae.brew.sh/formula/tree) is a tool for listing out the contents of a directory in a tree-style format.
+
+- `--noreport` Removes a summary line at the bottom ("10 directories, 35 files")
+- `--gitignore` Looks for a `.gitignore` file and excludes those directories, useful for those pesky `node_modules` directories
+- `-i` Removes the whitespace and indent (makes it better input for regex)
+
+## Grep
+
+Grep is a tool for searching text against a regex.  
+
+We pass in the input from tree into Regex, and only look for files that match a pattern
+
+- `-c` for "count", i.e. just tell me how many matches you found
+- `-E`for extended regex, it makes the `(js|ts)` fragment work