nnn/README.md at 370ed32a28f2ef3a8b875a208749ab8172f87d0c

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Arun Prakash Jana 2a1f99526f

Show current config along with help

2017-06-11 19:24:02 +05:30

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nnn

Noice is Not Noice, a noicer fork...

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Introduction
Features
Performance
Installation
Usage
Quickstart
How to
Why fork?
Mentions
Developers

Introduction

nnn is a fork of noice, a blazing-fast lightweight terminal file browser with easy keyboard shortcuts for navigation, opening files and running tasks. noice is developed considering terminal based systems. There is no config file and mime associations are hard-coded. However, the incredible user-friendliness and speed make it a perfect candidate for modern distros.

nnn works with the desktop opener, adds new navigation options, navigate-as-you-type mode, enhanced DE integration, bookmarks, a disk usage analyzer mode, comprehensive file details and much more. Add to that a huge performance boost. For a detailed comparison, visit nnn vs. noice.

If you want to edit a file in vim with some soothing music in the background while referring to a spec in your GUI PDF viewer, nnn got it! Quickstart and see how nnn simplifies those long desktop sessions...

Have fun with it! PRs are welcome. Check out #1.

Features

Navigation
- Familiar shortcuts
- Navigate-as-you-type mode
- Bookmarks
- Jump HOME or to the last visited directory (as usual!)
- Jump to initial dir, chdir prompt, cd ..... (with . as PWD)
- Roll-over at edges, page through entries
Disk usage analyzer mode
Search
- Filter directory contents with search-as-you-type
- Desktop search (default gnome-search-tool, customizable) integration
Mimes
- Desktop opener integration
- Optionally open text files in EDITOR (fallback vi)
- Customizable bash script nlay to handle actions
Information
- Basic and detail view
- Detailed file information
- Media information (needs mediainfo)
Ordering
- Numeric order (1, 2, ... 10, 11, ...) for numeric names
- Sort by modification time, size
Convenience
- Spawn a shell in the current directory
- Invoke file path copier (easy shell integration)
- Change directory at exit (easy shell integration)
- Open any file in EDITOR (fallback vi) or PAGER (fallback less)
- Open current directory in a custom GUI file browser
- Terminal screensaver (default vlock, customizable) integration
Unicode support
Highly optimized code, minimal resource usage

Performance

nnn vs. ncdu memory usage while listing 438767 files in disk usage analyzer mode:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
22515 vaio      20   0   60348  48712   2240 S   0.0  0.6   0:01.11 ncdu /
22574 vaio      20   0   17588   4320   2584 S   0.0  0.1   0:00.44 nnn /

nnn vs. mc vs. ranger memory usage while viewing a directory with 11244 files, sorted by size:

  PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND
28450 vaio      20   0   93848  51548   7724 S   0.0  0.6   0:00.64 /usr/bin/python -O /usr/bin/ranger
27265 vaio      20   0   67188  13620   6908 S   0.0  0.2   0:00.16 mc
28360 vaio      20   0   20520   6932   2512 S   0.0  0.1   0:00.20 nnn

Installation

nnn needs libreadline, libncursesw (on Linux or ncurses on OS X) and standard libc.

Packages are available on
- AUR
- Homebrew
- Ubuntu PPA
- Debian
Packages for Fedora 24 and CentOS 7 are available with the latest release
To cook yourself, download the latest stable release or clone this repository (risky). Then install the dependencies and compile (e.g. on Ubuntu 16.04):
```
$ sudo apt-get install libncursesw5-dev libreadline6-dev
$ make
$ sudo make install
```

Usage

Cmdline options

usage: nnn [-l] [-i] [-p custom_nlay] [-S] [-v] [-h] [PATH]

The missing terminal file browser for X.

positional arguments:
  PATH           directory to open [default: current dir]

optional arguments:
  -l             start in light mode (fewer details)
  -i             start in navigate-as-you-type mode
  -p             path to custom nlay
  -S             start in disk usage analyzer mode
  -v             show program version and exit
  -h             show this help and exit

> indicates the currently selected entry in nnn.

Keyboard shortcuts

                Key | Function
                   -+-
          Up, k, ^P | Previous entry
        Down, j, ^N | Next entry
           PgUp, ^U | Scroll half page up
           PgDn, ^D | Scroll half page down
     Home, g, ^, ^A | Jump to first entry
      End, G, $, ^E | Jump to last entry
Right, Enter, l, ^M | Open file or enter dir
  Left, Bksp, h, ^H | Go to parent dir
             Insert | Toggle navigate-as-you-type mode
                  ~ | Jump to HOME dir
                  & | Jump to initial dir
                  - | Jump to last visited dir
                  / | Filter dir contents
                 ^/ | Search dir in desktop search tool
                  . | Toggle hide .dot files
                  b | Show bookmark key prompt
                  c | Show change dir prompt
                  d | Toggle detail view
                  D | Toggle current file details screen
                  m | Show concise mediainfo
                  M | Show full mediainfo
                  s | Toggle sort by file size
                  S | Toggle disk usage analyzer mode
                  t | Toggle sort by modified time
                  ! | Spawn SHELL in PWD (fallback sh)
                  e | Edit entry in EDITOR (fallback vi)
                  o | Open dir in NNN_DE_FILE_MANAGER
                  p | Open entry in PAGER (fallback less)
                 ^K | Invoke file path copier
                 ^L | Force a redraw, exit filter prompt
                  ? | Toggle help and settings screen
                  Q | Quit and change directory
              q, ^Q | Quit

Filters

Filters support regexes to instantly (search-as-you-type) list the matching entries in the current directory.

There are 3 ways to reset a filter: ^L, a search with no matches or an extra backspace at the filter prompt (like vi).

Common examples: If you want to list all matches starting with the filter expression, start the expression with a ^ (caret) symbol. Type \.mkv to list all MKV files.

If nnn is invoked as root the default filter will also match hidden files.

Navigate-as-you-type mode

In this mode directories are opened in filter mode, allowing continuous navigation. Works best with the arrow keys.

File type abbreviations

The following abbreviations are used in the detail view:

Symbol	File Type
`/`	Directory
`*`	Executable
`\|`	Fifo
`=`	Socket
`@`	Symbolic Link
`b`	Block Device
`c`	Character Device

File handling

nnn uses xdg-open on Linux and open(1) on OS X as the desktop opener.
To edit all text files in EDITOR (preferably CLI, fallback vi):
```
  export NNN_USE_EDITOR=1
```

To enable the desktop file manager key, set NNN_DE_FILE_MANAGER. E.g.:

  export NNN_DE_FILE_MANAGER=thunar
  export NNN_DE_FILE_MANAGER=nautilus

mediainfo is required to view media information

Help

$ man nnn

To lookup keyboard shortcuts at runtime, press ?.

Quickstart

Add the following to your shell's rc file for the best experience:

Use a shorter and sweeter alias:
```
 alias n=nnn
```
Optionally open all text files in EDITOR (fallback vi):
```
 export NNN_USE_EDITOR=1
```
Set a desktop file manager to open directories with (if you ever need to). E.g.:
```
 export NNN_DE_FILE_MANAGER=thunar
```

Run n.

How to

add bookmarks

Set environment variable NNN_BMS as a string of key:location pairs (max 10) separated by semicolons (;):

export NNN_BMS='doc:~/Documents;u:/home/user/Cam Uploads;D:~/Downloads/'

use cd .....

To jump to the n^th level parent, with PWD at level 0, use n + 1 dots. For example, to jump to the 6 parent of the current directory, use 7 dots. If the number of dots would take you beyond / (which isn't possible), you'll be placed at /.

cd on quit

Pick the appropriate file for your shell from misc/quitcd and add the contents to your shell's rc file. You'll need to spawn a new shell for the change to take effect. You should start nnn as n (or modify the function name to something else).

As you might notice, nnn uses the environment variable NNN_TMPFILE to write the last visited directory path. You can change it.

copy file path to clipboard

nnn can pipe the absolute path of the current file to a copier script. For example, you can use xsel on Linux or pbcopy on OS X.

Sample Linux copier script:

#!/bin/sh

echo -n $1 | xsel --clipboard --input

export NNN_COPIER:

export NNN_COPIER="/path/to/copier.sh"

Start nnn and use ^K to copy the absolute path (from /) of the file under the cursor to clipboard.

file copy, move, delete

nnn doesn't support file copy, move, delete inherently. However, it simplifies the workflow:

copy the absolute path to a file by invoking the file path copier (^K)
spawn a shell in the current directory (!)
while typing the desired command, copy the file path (usually ^-Shift-V)

boost chdir prompt

nnn uses libreadline for the chdir prompt input. So all the fantastic features of readline (e.g. case insensitive tab completion, history, reverse-i-search) is available to you based on your readline configuration.

set idle timeout

The terminal screensaver is disabled by default. To set the wait time in seconds, use environment variable NNN_IDLE_TIMEOUT.

Why fork?

I chose to fork because:

one can argue my approach deviates from the goal of the original project - keep the utility suckless. In my opinion evolution is the taste of time.
I would like to have a bit of control on what features are added in the name of desktop integration. A feature-bloat is the last thing in my mind. Check out nnn design considerations for more details.

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nnn

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