feat(torrent): add preset support (#6)

* feat(torrent): presets

* feat(torrent): add preset support

* chore: make lint

* fix: preset locations

Author: s0up4200

Diff for: README.md

@@ -21,8 +21,10 @@ mkbrr is a command-line tool to create and inspect torrent files. Fast, single b
   - [Create a Torrent](#create-a-torrent)
     - [Single Mode](#single-mode)
     - [Batch Mode](#batch-mode)
+    - [Preset Mode](#preset-mode)
     - [Create Flags](#create-flags)
     - [Batch Configuration Format](#batch-configuration-format)
+    - [Preset Configuration Format](#preset-configuration-format)
   - [Inspect a Torrent](#inspect-a-torrent)
   - [Version Information](#version-information)
 - [Performance](#performance)
@@ -102,6 +104,8 @@ jobs:
       - https://releases.ubuntu.com/22.04/ubuntu-22.04.3-desktop-amd64.iso
     comment: "Ubuntu 22.04.3 LTS Desktop AMD64"
     private: false
+    # piece_length is automatically optimized based on file size:
+    # piece_length: 22  # manual override if needed (2^n: 14-24)
 
   - output: release.torrent
     path: /path/to/release
@@ -115,25 +119,80 @@ jobs:
 
 Batch mode will process all jobs in parallel (up to 4 concurrent jobs) and provide a summary of results.
 
+#### Preset Mode
+
+Create torrents using predefined settings from a preset configuration:
+
+```bash
+# Use a preset from a config file
+mkbrr create -P private path/to/file
+
+# Use a preset from a custom config file
+mkbrr create -P emp --preset-file custom-presets.yaml path/to/file
+
+# Override preset settings with command line flags
+mkbrr create -P private --source "CUSTOM" path/to/file
+```
+
+> [!TIP]
+> The preset file is searched for in the following locations (in order):
+> 1. File specified by `--preset-file` flag
+> 2. `presets.yaml` in the current directory
+> 3. `~/.config/mkbrr/presets.yaml` in the user's home directory
+> 4. `~/.mkbrr/presets.yaml` in the user's home directory
+
+Example presets.yaml:
+
+```yaml
+version: 1
+
+# Defaults that always apply
+default:
+  private: true
+  no_date: true
+
+presets:
+  # Empornium preset
+  emp:
+    source: "EMP"
+    trackers:
+      - "https://tracker.opentrackr.org/announce"
+    # piece_length is automatically optimized based on file size
+    # piece_length: 20  # manual override if needed (2^n: 14-24)
+
+  # Public tracker preset
+  public:
+    private: false  # overrides default preset
+    trackers:
+      - "udp://tracker.opentrackr.org:1337/announce"
+      - "udp://open.tracker.cl:1337/announce"
+      - "udp://9.rarbg.com:2810/announce"
+    # piece_length is automatically optimized based on file size
+    # piece_length: 22  # manual override if needed (2^n: 14-24)
+```
+
 #### Create Flags
 
 General flags:
 
 - `-b, --batch <file>`: Use batch configuration file (YAML)
+- `-P, --preset <name>`: Use preset from config
+- `--preset-file <file>`: Preset config file (default: ~/.config/mkbrr/presets.yaml)
 - `-v, --verbose`: Be verbose
 
 Single mode flags:
 
 - `-t, --tracker <url>`: Tracker URL
 - `-w, --web-seed <url>`: Add web seed URLs (can be specified multiple times)
-- `-p, --private`: Make torrent private
+- `-p, --private`: Make torrent private (default: true)
 - `-c, --comment <text>`: Add comment
 - `-l, --piece-length <n>`: Set piece length to 2^n bytes (14-24, automatic if not specified)
 - `-o, --output <path>`: Set output path (default: <name>.torrent)
 - `-s, --source <text>`: Add source string
 - `-d, --no-date`: Don't write creation date
 
 Note: When using batch mode (-b), torrent settings are specified in the YAML configuration file instead of command line flags.
+When using preset mode (-P), command line flags will override the preset settings.
 
 #### Batch Configuration Format
 
@@ -149,13 +208,74 @@ jobs:       # List of torrent creation jobs
       - string
     webseeds:           # Optional: List of webseed URLs
       - string
-    private: bool       # Optional: Make torrent private (default: false)
+    private: bool       # Optional: Make torrent private (default: true)
     piece_length: int   # Optional: Piece length exponent (14-24)
     comment: string     # Optional: Torrent comment
     source: string      # Optional: Source tag
     no_date: bool       # Optional: Don't write creation date (default: false)
 ```
 
+#### Preset Configuration Format
+
+The preset configuration file uses YAML format with the following structure:
+
+```yaml
+# yaml-language-server: $schema=https://raw.githubusercontent.com/autobrr/mkbrr/main/schema/presets.json
+version: 1    # Required, must be 1
+
+# Optional: Default settings that apply to all presets unless overridden
+default:
+  private: true
+  no_date: true
+  trackers:
+    - string
+  # ... other settings as needed
+
+presets:      # Map of preset names to their configurations
+  preset-name:
+    trackers:           # Optional: List of tracker URLs (overrides default)
+      - string
+    webseeds:           # Optional: List of webseed URLs (overrides default)
+      - string
+    private: bool       # Optional: Make torrent private (overrides default)
+    piece_length: int   # Optional: Piece length exponent (14-24)
+    comment: string     # Optional: Torrent comment (overrides default)
+    source: string      # Optional: Source tag (overrides default)
+    no_date: bool       # Optional: Don't write creation date (overrides default)
+```
+
+Any settings specified in a preset will override the corresponding default settings. This allows you to set common values in the `default` section and only specify differences in individual presets.
+
+Example presets.yaml:
+
+```yaml
+version: 1
+
+# Defaults that always apply
+default:
+  private: true
+  no_date: true
+
+presets:
+  # Empornium preset
+  emp:
+    source: "EMP"
+    trackers:
+      - "https://tracker.opentrackr.org/announce"
+    # piece_length is automatically optimized based on file size
+    # piece_length: 20  # manual override if needed (2^n: 14-24)
+
+  # Public tracker preset
+  public:
+    private: false  # overrides default preset
+    trackers:
+      - "udp://tracker.opentrackr.org:1337/announce"
+      - "udp://open.tracker.cl:1337/announce"
+      - "udp://9.rarbg.com:2810/announce"
+    # piece_length is automatically optimized based on file size
+    # piece_length: 22  # manual override if needed (2^n: 14-24)
+```
+
 ### Inspect a Torrent
 
 ```bash