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Add directory downloads and fix GitHub SPA support

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# Display Repo Info and File Sizes for GitHub
# GitHub OpenScripts
A lightweight OpenScript that displays total repository disk usage and age in the **About** section and each file's size beside its name in GitHub's file browser.
Small, independent [OpenScript](https://github.com/GetOpenScript/OpenScript) enhancements for GitHub. Install either script or both.
## Features
- **Accurate Git History Size**: Uses GitHub's native `repo.size` disk usage measurement, accurately reflecting the full Git history, delta compression, and packfiles rather than loose blobs.
- **Repository Age & Creation Timestamp**: Shows repository age in the About sidebar and displays the exact creation date and time with timezone on hover.
- **New Repo Handling**: If a repository was just pushed and GitHub is still computing initial disk usage (`0 KB`), it provides a friendly indicator (`0 KB (calculating...)`) until GitHub finishes indexing.
- **Integrated in About Section**: Injects cleanly under repository details in the right sidebar.
- **Individual File Sizes**: Shows human-readable byte sizes beside files in root and nested directory listings.
- **GitHub-Native Layout**: Targets only responsive filename cells, leaving commit messages, dates, links, and directory rows untouched.
- **Private Repositories Supported**: Uses `GH_PAT` from OpenScript secrets for private repositories and increased rate limits.
- **Turbo / SPA Compatible**: Seamlessly persists across GitHub's Turbo and client-side page transitions.
- **No Cache or Script Storage**: Reads fresh repository and directory data from GitHub's API for each rendered view.
## Scripts
### Display Repo Info and File Sizes
[`DisplayRepoInfo.os.js`](./DisplayRepoInfo.os.js) adds repository information and file sizes directly to GitHub's interface.
- Shows total repository disk usage and repository age in the **About** sidebar.
- Shows the exact repository creation date and time on hover.
- Adds human-readable sizes beside files in root and nested directory listings.
- Handles GitHub SPA navigation without requiring a page refresh.
- Uses GitHub-native layout, colors, and responsive filename cells.
- Supports private repositories through an optional `GH_PAT` secret.
This script requests repository metadata when the **About** section is rendered and directory contents when a GitHub file listing is rendered. It guards in-progress directory requests to avoid duplicate API calls during DOM updates.
### Download GitHub Directory
[`DownloadDir.os.js`](./DownloadDir.os.js) adds **Download directory** to the three-dot menu on GitHub directory pages.
- Makes no GitHub requests on page load, navigation, or menu opening.
- Starts all download-related requests only after **Download directory** is clicked.
- Uses one recursive Git Trees API request for a normal public repository, then retrieves file bytes from `raw.githubusercontent.com` without spending additional REST API quota.
- Falls back to additional tree requests only when GitHub truncates an unusually large recursive tree response.
- Downloads private repository files through authenticated Git blob requests.
- Builds the ZIP locally in the browser with JSZip and preserves the selected directory as its root folder.
- Handles GitHub SPA navigation and branch names containing slashes.
OpenScript downloads and caches the declared JSZip `@require` when the script is saved. It is not downloaded again on every GitHub page.
## Installation
Each file is a separate OpenScript:
## Installation in OpenScript
1. Open the **OpenScript** extension popup.
2. Click **+ New** in the header (or click your existing script to edit).
3. Paste the contents of [`DisplayRepoInfo.os.js`](./DisplayRepoInfo.os.js).
2. Click **+ New**.
3. Paste the contents of the script you want to install.
4. Click **save script**.
5. Repeat for the other script if you want both features.
## GitHub PAT Configuration (for Private Repos)
1. Generate a GitHub Personal Access Token (`repo` scope for private repos) at [github.com/settings/tokens](https://github.com/settings/tokens).
2. Open **OpenScript** and switch to the **Secrets** tab.
3. Add a secret:
- **Key**: `GH_PAT`
- **Value**: `<your_token>`
4. Click **+ Add**. OpenScript synchronizes the secret via `chrome.storage.sync` and securely provides it to your script as `OpenScript.env.GH_PAT`.
After updating an installed script, save it again and refresh the current GitHub page once. Later GitHub navigation works without refreshing.
## Private Repositories
Both scripts support a GitHub personal access token stored in OpenScript:
1. Create a GitHub token with read access to the required private repositories.
2. Open OpenScript and select the **Secrets** tab.
3. Add `GH_PAT` as the key and the token as its value.
4. Click **+ Add**, then re-save the scripts.
The scripts also recognize `GITHUB_PAT`, `GITHUB_TOKEN`, and `PAT`. Tokens are sent only to `api.github.com` and are never included in generated ZIP files.