# Open SaaS Tools

## dope.sh - Diff Or Patch Executor

The `dope.sh` script allows you to easily create a diff between two projects (base and derived),
or to patch those diffs onto the base project to get the derived one. This is useful when a derived
project has only small changes on top of the base project and you want to keep it in a directory
in the same repo as the main project.

Since derived apps (like opensaas-sh) are just the Open SaaS template with some small tweaks, and
we want to keep them up to date as the template changes, we don't version the actual app code in git.
Instead, we version the diffs between it and the template in an `app_diff/` directory.

### Usage

```bash
./dope.sh <BASE_DIR> <DERIVED_DIR> <ACTION>
```

- `<BASE_DIR>`: The base project directory (e.g., `../template/`)
- `<DERIVED_DIR>`: The derived project directory (e.g., `app/`)
- `<ACTION>`: Either `diff` or `patch`
  - `diff`: Creates a diff between the base and derived directories
  - `patch`: Applies existing diffs onto the base directory to recreate the derived directory

The diffs are stored in a directory named `<DERIVED_DIR>_diff/` (e.g., `app_diff/`).

### Diff structure

The diff directory can contain `.diff` files to patch files from the base directory,
and `.copy` files to copy files directly from the diff directory to the derived directory
(useful for binary files).

### Workflow

The typical workflow is:

1. Run `dope.sh` with the `patch` action to generate `app/` from `../template/` and `app_diff/`:

   ```bash
   ./dope.sh ../template app patch
   ```

2. If there are any conflicts (usually due to updates to the template), modify `app/` until you resolve them. Make any additional changes as needed.

3. Generate a new `app_diff/` based on the updated `app/` by running:
   ```bash
   ./dope.sh ../template app diff
   ```

### Requirements

#### Running on macOS

If you're running the `dope.sh` script on macOS, install:

- `grealpath` (packaged within `coreutils`)
- `gpatch`
- `diffutils`

```sh
brew install coreutils # contains grealpath
brew install gpatch
brew install diffutils
```

The script automatically detects macOS and uses `gpatch` instead of the default `patch` command.