sfm.nvim

The simple directory tree viewer for Neovim written in Lua.

I created the sfm plugin because I wanted to write my own simple and lightweight file management options for NeoVim. I wanted a plugin that would allow me to easily browse and open files in my project without being weighed down by unnecessary features or complexity.

Please note that the sfm plugin is still in development and may not be fully stable. Use at your own risk.

Demonstration

Here is a short demonstration of the sfm plugin in action:

https://user-images.githubusercontent.com/17776979/213235911-f2cfc886-5485-413d-8959-bf404ecc8451.mp4

Extensions

The sfm plugin allows users to extend its functionality by installing extensions. Extensions are independent plugins that can add new features or customize the behavior of the sfm plugin.

The extensions must be written under lua/sfm/extensions/ folder.

Available Extensions

Here is a list of available extensions for the sfm plugin:

• sfm-bookmark: Adds bookmarking functionality to the sfm plugin.
• sfm-filter: Allows users to filter entries in the sfm explorer tree.
• sfm-git: Adds git icon support to the sfm plugin's file and folder explorer view, indicating the git status of the file or folder.
• sfm-telescope: Allows users to search for entries in the sfm explorer tree.
• sfm-paste: Provides a convenient way to paste text or images into new files within the sfm file explorer.
• sfm-focus: Adds the command SFMFocus. This command change current focus to explorer and open it if closed.

Installation

Install sfm on Neovim using your favorite plugin manager. For example, the below example shows how to install sfm using packer.nvim

use {
  'dinhhuy258/sfm.nvim',
  config = function()
    require("sfm").setup()
  end
}

Configuration

sfm provides the following configuration options:

local default_config = {
  view = {
    side = "left", -- side of the tree, can be `left`, `right`. this setting will be ignored if view.float.enable is set to true,
    width = 30, -- this setting will be ignored if view.float.enable is set to true,
    float = {
      enable = false,
      config = {
        relative = "editor",
        border = "rounded",
        width = 30, -- int or function
        height = 30, -- int or function
        row = 1, -- int or function
        col = 1 -- int or function
      }
    },
    selection_render_method = "icon" -- render method of selected entries, can be `icon`, `sign`, `highlight`.
  },
  mappings = {
    custom_only = false,
    list = {
      -- user mappings go here
    }
  },
  renderer = {
    icons = {
      file = {
        default = "",
        symlink = "",
      },
      folder = {
        default = "",
        open = "",
        symlink = "",
        symlink_open = "",
      },
      indicator = {
        folder_closed = "",
        folder_open = "",
        file = " ",
      },
      selection = "",
    }
  },
  file_nesting = {
    enabled = false,
    expand = false,
    patterns = {},
  },
  misc = {
    trash_cmd = nil,
    system_open_cmd = nil,
  }
}

You can override the default configuration by calling the setup method and passing in your customizations:

require("sfm").setup {
--- your customization configuration
}

File nesting

The sfm now supports nesting related files based on their names. There are several settings to control this behavior:

require("sfm").setup({
  file_nesting = {
    enabled = true, -- controls whether file nesting is enabled
    expand = true, -- controls whether nested files are expanded by default
    patterns = {
      { "*.cs", { "$(capture).*.cs" } },
      { "*.ts", { "$(capture).js", "$(capture).d.ts.map", "$(capture).*.ts", "$(capture)_*.js", "$(capture)_*.ts" } },
      { "go.mod", { "go.sum" } },
    }, -- controls how files get nested
  }
})

The default mapping to expand/collapse nested files is a.

The idea of how to parse the file nesting pattern is highly inspired by VS Code. That why you can use the patterns that configure from VS Code. However, Currently I just only support $(capture) substitute as I find it not unnecessary to support basename, dirname, extname.

Commands

:SFMToggle Open or close the explorer.

Mappings

To use the functionalities provided by the sfm plugin, you can use the following key bindings:

Key	Action	Description
cr	edit	Open a file or directory
ctr-v	vsplit	Open a file in a vertical split window
ctr-h	split	Open a file in a horizontal split window
ctr-t	tabnew	Open a file in a new tab
s-tab	close_entry	Close current opened directory or parent
K	first_sibling	Navigate to the first sibling of current file or directory
J	last_sibling	Navigate to the last sibling of current file or directory
P	parent_entry	Move cursor to the parent directory
ctr-]	change_root_to_parent	Change the root directory to the parent directory of the current root
]	change_root_to_entry	Change the root directory to the current folder entry or to the parent directory of the current file entry
R	reload	Reload the explorer
q	close	Close the explorer window
n	create	Create a new file/directory in the current folder
c	copy	Copy current/selected file/s directory/ies
x	move	Move/Rename current/selected file/s directory/ies
d	delete	Delete current/selected file/s directory/ies
a	toggle_entry	Expand or collapse a entry with children, which may be a directory or a nested file.
space	toggle_selection	Toggle the selection of the current file or directory
c-space	clear_selections	Clear all selections
	trash	Trash current/selected file/s directory/ies
	system_open	Open current/selected file/s directory/ies using system default program

You can customize these key bindings by defining custom functions or action names in the mappings configuration option. For example, you can assign a custom function to the t key:

local sfm_explorer = require("sfm").setup {
  mappings = {
    list = {
      {
        key = "c",
        action = function()
          print("Custom function executed")
        end,
      },
      {
        key = "x",
        action = "close",
      },
    },
  },
}

In this example, when the user presses the c key in the explorer, the custom function function() print("Custom function executed") end will be executed. Pressing the x key will perform the default action close. Please note that if the action for a key is set to nil or an empty string, the default key binding for that key will be disabled. Also, ensure that the action provided is a valid function or action name, as listed in the above table.

Window Picker Integration

sfm integrates with the window-picker plugin if it's installed. This allows you to choose which window to open files in when using the split and vsplit actions.

How it works

1. When you use the split or vsplit action, sfm checks if window-picker is installed
2. If available, it triggers the window-picker UI to let you select a target window
3. The file is then opened in your chosen window
4. If window-picker is not installed, it falls back to the default behavior

Highlighting

The sfm plugin uses the following highlight values:

• SFMRootFolder: This highlight value is used to highlight the root folder in the file explorer. The default color scheme for this highlight value is purple.
• SFMSymlink: This highlight value is used to highlight symbolic links in the file explorer. The default color scheme for this highlight value is cyan.
• SFMFileIndicator and SFMFolderIndicator : These highlight values are used to highlight file and folder indicators in the file explorer. The default color scheme for this highlight value is fg=#3b4261.
• SFMFolderName and SFMFolderIcon : These highlight values are used to highlight folder names and icons in the file explorer. The default color scheme for this highlight value is Directory.
• SFMFileName and SFMDefaultFileIcon : These highlight values are used to highlight file names and icons in the file explorer. The default color scheme for this highlight value is Normal.

In addition to the above highlight values, the sfm plugin also uses the following highlight values:

• SFMNormal, SFMNormalNC, SFMEndOfBuffer, SFMCursorLine, SFMCursorLineNr, SFMLineNr, SFMWinSeparator, SFMStatusLine, SFMStatuslineNC, SFMSignColumn these highlight values are used to link to the default Neovim highlight groups.

Customizations

The sfm plugin provides several customization mechanisms, including remove_renderer, register_renderer, remove_entry_filter, register_entry_filter, and set_entry_sort_method, that allow users to alter the appearance and behavior of the explorer tree.

remove_renderer

The remove_renderer function allows users to remove a renderer components from the list of renderers used to render the entry of the explorer tree. This can be useful if a user wants to disable a specific renderer provided by the sfm plugin or by an extension.

register_renderer

The register_renderer function allows users to register their own renderers for the explorer tree. This can be useful if a user wants to customize the appearance of the tree or add new features to it.

Here is an example of an extension for the sfm plugin that adds a custom renderer to display the entry size:

-- define a custom renderer that displays the entry size
local function size_renderer(entry)
  local stat = vim.loop.fs_stat(entry.path)
  local size = stat.size
  local size_text = string.format("[%d bytes]", size)

  return {
    text = size_text,
    highlight = "SFMSize",
  }
end

local sfm_explorer = require("sfm").setup {}
-- register the custom renderer
sfm_explorer:register_renderer("custom", 100, size_renderer)

The default entry renderers, in order of rendering priority, are:

• indent (priority 10)
• indicator (priority 20)
• icon (priority 30)
• name (priority 40)

register_entry_filter

The register_entry_filter function allows users to register their own filters for the explorer tree. This can be useful if a user wants to filter out certain entries based on certain criteria. For example, a user can filter out files that are larger than a certain size, or files that have a certain file extension.

remove_entry_filter

The remove_entry_filter function allows users to remove a filter component from the list of filters used to filter the entries of the explorer tree. This can be useful if a user wants to disable a specific filter provided by the sfm plugin or by an extension.

Here is an example of an extension for the sfm plugin that adds a custom entry filter to hide the big entry size:

local sfm_explorer = require("sfm").setup {}
sfm_explorer:register_entry_filter("big_files", function(entry)
  local stat = vim.loop.fs_stat(entry.path)
  local size = stat.size
  if size > 1000000 then
    return false
  else
    return true
  end
end)

set_entry_sort_method

This method allows you to customize the sorting of entries in the explorer tree. The function passed as a parameter should take in two entries and return a boolean value indicating whether the first entry should be sorted before the second. For example, you can use the following function to sort entries alphabetically by name:

local sfm_explorer = require("sfm").setup {}
sfm_explorer:set_entry_sort_method(function(entry1, entry2)
  return entry1.name < entry2.name
end)

Events

sfm dispatches events whenever an action is made in the explorer. These events can be subscribed to through handler functions, allowing for even further customization of sfm.

To subscribe to an event, use the subscribe function provided by sfm and specify the event name and the handler function:

local sfm_explorer = require("sfm").setup {}
sfm_explorer:subscribe(event.ExplorerOpened, function(payload)
  local bufnr = payload["bufnr"]
  local options = {
    noremap = true,
    expr = false,
  }

  vim.api.nvim_buf_set_keymap(
    bufnr,
    "n",
    "m",
    "<CMD>lua require('sfm.extensions.sfm-bookmark').set_mark()<CR>",
    options
  )
  vim.api.nvim_buf_set_keymap(
    bufnr,
    "n",
    "`",
    "<CMD>lua require('sfm.extensions.sfm-bookmark').load_mark()<CR>",
    options
  )
end)

Available events:

• ExplorerOpened: Triggered when the explorer window is opened. The payload of the event is a table with the following keys:
  • winnr: The number of the window where the explorer is opened.
  • bufnr: The number of the buffer associated with the explorer window.
• ExplorerClosed: Triggered when the explorer window is closed. It does not provide any payload.
• ExplorerReloaded: Triggered when a explorer is reloaded. This event is emitted after the explorer tree has finished reloading, and all the files and folders have been re-read. Listeners can use this event to update or refresh any state or information that is dependent on the explorer tree. It does not provide any payload.
• ExplorerRendered: Triggered when a explorer is rendered. This event can be used to perform additional customizations or updates after the explorer has been rendered. The payload of the event is a table with the following keys:
  • winnr: The number of the window explorer.
  • bufnr: The number of the buffer associated with the explorer window.
• ExplorerRootChanged: This event is fired when the root of the explorer changes. The payload of the event is a table with the following key:
  • path: The new root path
• FileOpened: Triggered when a file is opened in the explorer. The payload of the event is a table with the following key:
  • path: The path of the file that was opened.
• FolderOpened: Triggered when a folder is opened in the explorer. The payload of the event is a table with the following key:
  • path: The path of the folder that was opened.
• FolderClosed: Triggered when a folder is closed in the explorer. The payload of the event is a table with the following key:
  • path: The path of the folder that was closed.
• EntryCreated: Dispatched when a new file/directory is created. The payload of the event is a table with the following keys:
  • path: The entry path of the newly created entry
• EntryDeleted: Dispatched when a new file/directory is created. The payload of the event is a table with the following keys:
  • path: The entry path of the deleted/trashed entry
• EntryWillRename: Dispatched when a file/directory will be renamed. The payload of the event is a table with the following keys:
  • from_path: The old path
  • to_path: The new path
• EntryRenamed: Dispatched when a file/directory is renamed. The payload of the event is a table with the following keys:
  • from_path: The old path
  • to_path: The new path

API

The sfm plugin exposes a number of APIs that can be used to customize the explorer tree and write extensions for the plugin. These functions are located in the lua/sfm/api.lua file and can be accessed by requiring it. Below are the available functions and their usage:

Explorer

• api.explorer.toggle(): Toggles the visibility of the explorer window.
• api.explorer.open(): Opens the explorer window.
• api.explorer.close(): Closes the explorer window.
• api.explorer.is_open(): Returns true if the explorer window is currently open, false otherwise.
• api.explorer.reload(): Reloads the explorer tree.
• api.explorer.refresh(): Refreshes the current view of the explorer tree.
• api.explorer.change_root(cwd: string): Changes the root directory of the explorer tree to the specified directory. If the directory is not valid, an error message will be displayed.

Entry

• api.entry.root(): Returns the root entry of the explorer tree.
• api.entry.current(): Returns the current entry in the explorer tree.
• api.entry.all(): Returns a table containing all the entries in the explorer tree.

Navigation

• api.navigation.focus(p: string): Focuses on the specified file or directory in the explorer tree.

Path

• api.path.clean(p: string): Cleans up a file path to make it more standard.
• api.path.split(p: string): Splits a file path into a table of its parts.
• api.path.join(...): Joins a list of parts into a file path.
• api.path.dirname(p: string): Returns the directory name of a file path.
• api.path.basename(p: string): Returns the base name of a file path.
• api.path.remove_trailing(p: string): Removes the trailing path separator from a file path.
• api.path.has_trailing(p: string): Returns true if the file path has a trailing path separator, false otherwise.
• api.path.add_trailing(p: string): Add trailing separator to the given path
• api.path.exists(p: string): Check if the given path exists
• api.path.isfile(p: string): Check if the given path is a file
• api.path.isdir(p: string): Check if the given path is a directory
• api.path.islink(p: string): Check if the given path is a symbolic link
• api.path.unify(paths: table): Unify ancestor for the given paths
• api.path.path_separator: Get the system path separator

Debouncing

• api.debounce(name: string, delay: integer, fn: function): Create a debounced version of the given function

Logging

• api.log.info(message: string): Log an informational message
• api.log.warn(message: string): Log a warning message
• api.log.error(message: string): Log an error message

Context

• api.context.is_selected(path: string): Check if the given path is selected
• api.context.set_selection(path: string): Bookmark the given path
• api.context.remove_selection(path: string): Unbookmark the given path
• api.context.clear_selections(): Clear all bookmarks
• api.context.get_selections(): Get all bookmarks

Events

• api.event.dispatch(event_name: string, payload: table?): Dispatches an event with the given name and payload to all registered event handlers.

Here's an example of how you might use the API provided by the sfm plugin in your own extension or configuration file:

local api = require('sfm.api')
-- use the `path.remove_trailing` function to remove trailing slashes from a file path
local cleaned_path = api.path.remove_trailing('/path/to/file/')
-- use the `debounce` function to debounce a function call
api.debounce("debounce-context", 1000, function()
  -- your code
end)

Credits

• This plugin was developed using NeoVim.
• The file explorer functionality is based on the nvim-tree plugin. I also copied some code from there.
• The icons used in the file explorer are from the nvim-web-devicons.