使用命令数据库开发 ulauncher 扩展

周末，我通过 Reddit 找到了一个项目，涉及 Flow Launcher 的插件。我为我的 Ubuntu Linux 环境创建了一个 fzf 和 rofi 版本，然后想，将其移植到 uLauncher 有多难？

在这里我记录了我所做的事情。

1.在~/.local/share/ulauncher/extensions/里面

创建一个新目录。就我而言，我创建了 ~/.local/share/ulauncher/extensions/com.github.ubuntupunk.ulauncher-vim

2. 触摸以下文件：

├── images
│   └── icon.png
├── versions.json
├── manifest.json
└── main.py

3. 在 versions.json 中放置以下样板：

[
  {"required_api_version": "2", "commit": "master"}
]

4. 在manifest.json中

{
  "required_api_version": "2",
  "name": "Demo extension",
  "description": "Extension Description",
  "developer_name": "John Doe",
  "icon": "images/icon.png",
  "options": {
    "query_debounce": 0.1
  },
  "preferences": [
    {
      "id": "demo_kw",
      "type": "keyword",
      "name": "Demo",
      "description": "Demo extension",
      "default_value": "dm"
    }
  ]
}

5. 在main.py中

from ulauncher.api.client.Extension import Extension
from ulauncher.api.client.EventListener import EventListener
from ulauncher.api.shared.event import KeywordQueryEvent, ItemEnterEvent
from ulauncher.api.shared.item.ExtensionResultItem import ExtensionResultItem
from ulauncher.api.shared.action.RenderResultListAction import RenderResultListAction
from ulauncher.api.shared.action.HideWindowAction import HideWindowAction


class DemoExtension(Extension):

    def __init__(self):
        super().__init__()
        self.subscribe(KeywordQueryEvent, KeywordQueryEventListener())


class KeywordQueryEventListener(EventListener):

    def on_event(self, event, extension):
        items = []
        for i in range(5):
            items.append(ExtensionResultItem(icon='images/icon.png',
                                             name='Item %s' % i,
                                             description='Item description %s' % i,
                                             on_enter=HideWindowAction()))

        return RenderResultListAction(items)

if __name__ == '__main__':
    DemoExtension().run()

6.现在编辑manifest.json

{
  "required_api_version": "2",
  "name": "Vim Prompter",
  "description": "Vim cheatsheet helper",
  "developer_name": "David Robert Lewis",
  "icon": "images/icon.png",
  "options": {
    "query_debounce": 0.1
  },
  "preferences": [
    {
      "id": "vm_kw",
      "type": "keyword",
      "name": "Vim",
      "description": "Search for Vim commands",
      "default_value": "vm"
    }
  ]

7.在main.py中添加命令加载功能

class VmExtension(Extension):
    def load_vim_commands(self):
        """Load Vim commands from JSON file."""
        package_dir = os.path.dirname(os.path.abspath(__file__))
        full_path = os.path.join(package_dir, 'db', 'commands.json')   
        with open(full_path, 'r') as file:
            return json.load(file)

    def __init__(self):
        super().__init__()
        self.vim_commands = self.load_vim_commands()
        self.subscribe(KeywordQueryEvent, KeywordQueryEventListener())

8. 使用以下内容创建 db 文件夹：

commands.json

示例结构：

{
  "categories": {
    "navigation": {
      "name": "Navigation",
      "patterns": [
        "scroll",
        "jump",
        "goto",
        "position"
      ],
      "subcategories": {
        "cursor": {
          "name": "Cursor Movement",
          "patterns": [
            "move[s]? cursor",
            "^[hjkl]$",
            "^[HJKL]$",
            "^[wWeEbB]$"
          ]
        },

您可以在此处查看完整的commands.json。

9. 修改KeywordQueryEventListener以实现搜索功能。

class KeywordQueryEventListener(EventListener):
    def on_event(self, event, extension):
        query = event.get_argument() or ""
        items = []

        # If no query, show all commands (limited to first 8)
        commands_to_show = extension.vim_commands

        # If there's a query, filter commands
        if query:
            commands_to_show = [
                cmd for cmd in extension.vim_commands
                if query.lower() in cmd['command'].lower() or 
                   query.lower() in cmd['description'].lower()
            ]

        # Limit results to first 8 matches
        for cmd in commands_to_show[:8]:
            items.append(ExtensionResultItem(
                icon='images/icon.png',
                name=cmd['command'],
                description=f"{cmd['name']} - {cmd['description']}",
                on_enter=HideWindowAction()
            ))

        return RenderResultListAction(items)

10.添加URL打开功能。我们需要导入 webbrowser 并修改 on_enter 操作以打开 Vim 命令 URL

from ulauncher.api.shared.action.OpenUrlAction import OpenUrlAction

class KeywordQueryEventListener(EventListener):
    def on_event(self, event, extension):
        query = event.get_argument() or ""
        items = []

        commands_to_show = extension.vim_commands

        if query:
            commands_to_show = [
                cmd for cmd in extension.vim_commands
                if query.lower() in cmd['command'].lower() or 
                   query.lower() in cmd['description'].lower()
            ]

        for cmd in commands_to_show[:8]:
            url = f"https://vim.rtorr.com/#:~:text={cmd['rtorr_description']}"
            items.append(ExtensionResultItem(
                icon='images/icon.png',
                name=cmd['command'],
                description=f"{cmd['name']} - {cmd['description']}",
                on_enter=OpenUrlAction(url)
            ))

        return RenderResultListAction(items)

11. 主要变化是：

• 添加了 OpenUrlAction 导入
• 用 OpenUrlAction 替换 HideWindowAction
• 使用命令的 rtorr_description 构造 URL

12.完整的项目代码可以在这里查看：

ulauncher-vim 仓库

以及此处的 ulauncher 扩展

参考

1. https://dev.to/brpaz/an-introduction-to-ulauncher-extension-development-1m69
2. https://ext.ulauncher.io/-/github-ubuntupunk-ulauncher-vim

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