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Add efinger: a Finger client and .plan feed reader

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Efinger is a client for the Finger protocol (RFC 1288) with an
Elfeed-inspired reader.  Configure a list of accounts once and browse
their .plan files from a two-pane interface: an account list on one
side and the fingered content on the other.

Move with n/p to preview each account, RET to read one in full, l to go
back to the list and q to close both panes.  M-x efinger-finger fingers
a single account on demand.

Connections are asynchronous (:nowait) with a configurable timeout, so
Emacs never freezes when a host resolves but never answers on port 79.

The finger core is forked from GNU Emacs' net-utils.el (by Peter
Breton) and rewritten around an asynchronous connection.
This commit is contained in:
Andros Fenollosa 2026-08-18 10:52:59 +02:00
commit 324cef61d5
6 changed files with 1670 additions and 0 deletions
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might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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EMACS ?= emacs
PACKAGE = efinger.el
TESTS = test/efinger-test.el
.PHONY: all check compile checkdoc package-lint test clean
all: check test
check: compile checkdoc package-lint
compile:
"$(EMACS)" --batch --eval "(setq byte-compile-error-on-warn t)" \
--eval "(byte-compile-file \"$(PACKAGE)\")"
checkdoc:
"$(EMACS)" --batch --eval "(checkdoc-file \"$(PACKAGE)\")"
package-lint:
"$(EMACS)" --batch \
--eval "(require 'package)" \
--eval "(add-to-list 'package-archives '(\"melpa\" . \"https://melpa.org/packages/\") t)" \
--eval "(package-initialize)" \
--eval "(unless (package-installed-p 'package-lint) (package-refresh-contents) (package-install 'package-lint))" \
--eval "(require 'package-lint)" \
-f package-lint-batch-and-exit $(PACKAGE)
test:
"$(EMACS)" --batch -L . -l $(TESTS) -f ert-run-tests-batch-and-exit
clean:
rm -f *.elc

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# Efinger for Emacs
A client for the [Finger protocol](https://www.rfc-editor.org/rfc/rfc1288.html) (RFC 1288) with an [Elfeed](https://github.com/skeeto/elfeed)-inspired reader for Emacs.
Requires Emacs 28.1 or later.
Finger, born at Stanford in 1971, is arguably the first social network: your whole profile lives in a plain-text `.plan` file that anyone can read with `finger you@your-host`. John Carmack famously kept his DOOM/Quake development diary this way. Efinger lets you keep a list of accounts and browse their `.plan` files from a two-pane interface, the same way you follow feeds in Elfeed. For the story behind the protocol, see [Finger: la red social de 1971](https://andros.dev/blog/79c99190/finger-la-red-social-de-1971-que-nunca-llego-a-morir/).
## How it works
```
Emacs Finger servers (TCP 79)
+---------------------+
| *efinger* | n / p +----------------------+
| ------------------ |------ move -->| happynetbox.com |
| >random@happynetbox | | thebackupbox.net |
| Carmack diary | RET / l | your own fingerd |
| ring@thebackupbox |<-- enter/back | |
+----------+----------+ +----------+-----------+
| |
v preview | async, :nowait
+---------------------+ |
| *efinger .plan* |<-------------------------+
| the fingered text |
+---------------------+
```
1. You keep a list of finger accounts in `efinger-accounts`.
2. `M-x efinger` opens the account list next to a content pane.
3. Moving with `n` / `p` fingers the account under point and previews its `.plan` in the other pane, asynchronously so Emacs never blocks.
4. `RET` jumps into the content, `l` goes back to the list, `q` closes both panes.
## Buffers
### Account list + content (`M-x efinger`)
```
Efinger — n/p move · RET open · g refresh · q quit
┌────────────────────────┬───────────────────────────────────────┐
│ random@happynetbox.com │ johnc@idsoftware.com │
│ Carmack diary │ ───────────────────────────────────── │
│ ring@thebackupbox.net │ │
│ me@happynetbox.com │ -------------------------------------- │
│ │ John Carmack's .plan for Aug 18, 1997 │
│ │ -------------------------------------- │
│ │ │
│ │ I get asked about the DOOM source code │
│ │ every once in a while, so here is a │
│ │ full status update: │
│ │ ... │
└────────────────────────┴───────────────────────────────────────┘
```
### Single account (`M-x efinger-finger`)
```
.plan — l back · n/p next/prev · g refresh · q quit
random@happynetbox.com
──────────────────────
Emily Carter
Marine biologist. Coffee, kayaks and old maps.
--- 2026-08-14 ---
Back from sampling on the coast. Three jars of plankton to review.
```
## Features
- **Account list**: keep your finger accounts in `efinger-accounts` and browse them in a dedicated buffer, the way Elfeed lists feeds.
- **Live preview**: move with `n` / `p` and the `.plan` under point is fingered and shown in the content pane automatically.
- **Two-pane reader**: `RET` enters the content pane to read and scroll, `l` returns to the list, `q` closes both.
- **Asynchronous connections**: connections use `:nowait`, so Emacs never freezes even when a host resolves but never answers on port 79 (the common case today).
- **Connection timeout**: a stalled connection is abandoned after `efinger-connection-timeout` seconds with a clear message, instead of hanging.
- **Graceful errors**: refused or timed-out connections are reported in the content pane, never as a backtrace.
- **One-off finger**: `M-x efinger-finger` fingers a single `user@host` in its own buffer.
- **Configurable layout**: list on the left and content on the right (`horizontal`), or list on top and content below (`vertical`).
- **Ports and listing**: targets accept an optional `:port`; omitting the user (`host` or `@host`) asks the server to list every user.
- **UTF-8**: replies are decoded as UTF-8, so accents and box drawing render correctly.
## Keymap
### Account list (`efinger-list-mode`)
| Key | Description |
|-------|------------------------------------------|
| `n` | Move to next account and preview it |
| `p` | Move to previous account and preview it |
| `RET` | Enter the content pane for this account |
| `g` | Re-finger the account at point |
| `G` | Rebuild the list from `efinger-accounts`|
| `q` | Close both panes |
### Content pane (`efinger-plan-mode`)
| Key | Description |
|-------|------------------------------------------|
| `l` | Back to the account list |
| `n` | Preview next account (stay in content) |
| `p` | Preview previous account (stay in content)|
| `g` | Re-finger the current account |
| `q` | Close both panes |
| `SPC` / `DEL` | Scroll the content up / down |
## Installation
### MELPA
```
M-x package-install RET efinger RET
```
### use-package with :vc (Emacs 29+)
```elisp
(use-package efinger
:vc (:url "https://git.andros.dev/andros/efinger.el"
:rev :newest)
:config
(setq efinger-accounts
'("random@happynetbox.com"
("Backup Box ring" "ring@thebackupbox.net"))))
```
### use-package with :load-path
For manual installation or Emacs < 29:
```elisp
(use-package efinger
:load-path "/path/to/efinger.el"
:config
(setq efinger-accounts
'("random@happynetbox.com"
("Backup Box ring" "ring@thebackupbox.net"))))
```
### Manual
Clone the repository and place the file in a directory on your `load-path`:
```sh
git clone https://git.andros.dev/andros/efinger.el.git
```
Then add to your init file:
```elisp
(add-to-list 'load-path "/path/to/efinger.el")
(require 'efinger)
(setq efinger-accounts
'("random@happynetbox.com"
("Backup Box ring" "ring@thebackupbox.net")))
```
## Usage
1. Set `efinger-accounts` in your init file. Each entry is either a
`"[user@]host[:port]"` string or a `(LABEL "[user@]host[:port]")` list.
2. Run `M-x efinger` to open the reader.
3. Move with `n` / `p` to preview each account, `RET` to read one in full,
`l` to return to the list and `q` to quit.
4. Or run `M-x efinger-finger` to finger a single account on demand.
Public servers you can try today: `random@happynetbox.com`,
`benbrown@happynetbox.com` and `ring@thebackupbox.net`.
## Customization
Run `M-x customize-group RET efinger RET` to list all available options.
Key options:
- `efinger-accounts`: the accounts shown in the reader.
- `efinger-port` (default `79`): default finger TCP port.
- `efinger-connection-timeout` (default `10`): seconds before a stalled
connection is abandoned; `nil` waits indefinitely.
- `efinger-forward-host` (default `nil`): send `user@host` instead of just
`user` (finger forwarding, for old daemons).
- `efinger-layout` (default `horizontal`): `horizontal` (list left, content
right) or `vertical` (list top, content bottom).
- `efinger-list-width` (default `40`): list width in columns (horizontal).
- `efinger-list-height` (default `12`): list height in lines (vertical).
## The Finger protocol
Finger is minimal: the client opens a TCP connection to port 79 of the server,
sends a single line (the user name, or an empty line to list everyone)
terminated by CRLF, and the server replies with plain text and closes the
connection. No encryption, no headers, no sessions. You can speak it by hand:
```sh
echo "random" | nc happynetbox.com 79
```
## Contributing
Contributions are welcome! Please see the [contribution guidelines](https://git.andros.dev/andros/contribute) for instructions on how to submit issues or pull requests.
## License
This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with this program. If not, see [https://www.gnu.org/licenses/](https://www.gnu.org/licenses/).

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;;; efinger.el --- Finger client and .plan feed reader -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Andros Fenollosa
;; Author: Andros Fenollosa <hi@andros.dev>
;; Maintainer: Andros Fenollosa <hi@andros.dev>
;; Version: 0.1.0
;; Package-Requires: ((emacs "28.1"))
;; Keywords: comm
;; URL: https://git.andros.dev/andros/efinger.el
;; SPDX-License-Identifier: GPL-3.0-or-later
;; This file is NOT part of GNU Emacs.
;; This program is free software; you can redistribute it and/or
;; modify it under the terms of the GNU General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;; General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with this program. If not, see
;; <https://www.gnu.org/licenses/>.
;;; Commentary:
;; Efinger is a client for the Finger user information protocol
;; (RFC 1288) with an Elfeed-inspired reader. Configure a list of
;; accounts once and browse their `.plan' files from a two-pane
;; interface: a list of accounts on one side and the fingered content
;; on the other.
;;
;; Finger, born at Stanford in 1971, is arguably the first social
;; network: your whole profile lives in a plain-text `.plan' file that
;; anyone can read with `finger you@your-host'. John Carmack famously
;; kept his development diary this way.
;;
;; Usage:
;;
;; (setq efinger-accounts
;; '("random@happynetbox.com"
;; ("Backup Box ring" "ring@thebackupbox.net")))
;;
;; M-x efinger - open the two-pane reader
;; M-x efinger-finger - finger a single account
;;
;; In the account list, move with `n' and `p' to preview each `.plan'
;; in the other pane, press RET to jump into the content, `l' to go
;; back to the list and `q' to close both panes.
;;; Code:
(require 'subr-x)
;;;; Customization
(defgroup efinger nil
"Finger protocol client and .plan feed reader."
:group 'communication
:prefix "efinger-")
(defcustom efinger-accounts nil
"List of finger accounts shown in the `efinger' reader.
Each entry is either a string of the form \"[USER@]HOST[:PORT]\",
or a list (LABEL TARGET) where LABEL is the text shown in the
account list and TARGET is such a string.
If USER is omitted the server is asked to list every user. If
PORT is omitted `efinger-port' is used."
:type '(repeat (choice
(string :tag "user@host")
(list :tag "Labelled account"
(string :tag "Label")
(string :tag "user@host")))))
(defcustom efinger-port 79
"Default TCP port used to reach the finger service."
:type 'natnum)
(defcustom efinger-connection-timeout 10
"Seconds to wait for a finger connection before giving up.
If the connection is still being established after this many
seconds, it is aborted and the user is notified. A value of nil
means wait indefinitely."
:type '(choice (natnum :tag "Seconds")
(const :tag "No timeout" nil)))
(defcustom efinger-forward-host nil
"Non-nil means send \"USER@HOST\" as the finger query.
The default sends only USER, which is what modern finger hosts
such as happynetbox.com expect. Enable this for old daemons that
rely on finger forwarding."
:type 'boolean)
(defcustom efinger-layout 'horizontal
"How the account list and the .plan content are arranged.
`horizontal' places the list on the left and the content on the
right; `vertical' places the list on top and the content below."
:type '(choice (const :tag "List left, content right" horizontal)
(const :tag "List top, content bottom" vertical)))
(defcustom efinger-list-width 40
"Width in columns of the account list with a `horizontal' layout."
:type 'natnum)
(defcustom efinger-list-height 12
"Height in lines of the account list with a `vertical' layout."
:type 'natnum)
;;;; Faces
(defface efinger-account-face
'((t :inherit default))
"Face for account labels in the list.")
(defface efinger-header-face
'((t :inherit bold))
"Face for the header of a fingered .plan.")
(defface efinger-status-face
'((t :inherit shadow))
"Face for transient status messages in the content pane.")
(defface efinger-error-face
'((t :inherit error))
"Face for connection errors in the content pane.")
;;;; Internal state
(defconst efinger-list-buffer-name "*efinger*"
"Name of the buffer holding the account list.")
(defconst efinger-plan-buffer-name "*efinger .plan*"
"Name of the buffer holding the fingered .plan content.")
(defvar efinger--list-buffer nil
"The live account-list buffer, or nil.")
(defvar-local efinger--accounts nil
"Normalized accounts rendered in the current list buffer.")
(defvar-local efinger--owner nil
"Network process currently allowed to write to this buffer.")
(defvar-local efinger--received nil
"Non-nil once the current fetch has written its first output.")
(defvar-local efinger--body-start nil
"Marker where the fingered content begins in this buffer.")
;;;; Account parsing
(defun efinger--parse-target (target label)
"Parse TARGET, a \"[user@]host[:port]\" string, into an account plist.
LABEL is stored as the account's display label."
(let* ((at (string-search "@" target))
(user (if at (substring target 0 at) ""))
(hostport (if at (substring target (1+ at)) target))
(colon (string-search ":" hostport))
(host (if colon (substring hostport 0 colon) hostport))
(port (if colon
(string-to-number (substring hostport (1+ colon)))
efinger-port)))
(list :label label :user user :host host :port port)))
(defun efinger--parse-account (entry)
"Normalize ENTRY from `efinger-accounts' into an account plist."
(pcase entry
((pred stringp) (efinger--parse-target entry entry))
(`(,label ,target) (efinger--parse-target target label))
(_ (error "Invalid efinger account: %S" entry))))
(defun efinger--account-title (account)
"Return a human-readable \"user@host\" title for ACCOUNT."
(let ((user (plist-get account :user))
(host (plist-get account :host))
(port (plist-get account :port)))
(concat (if (string= user "") "" (concat user "@"))
host
(if (eql port efinger-port) "" (format ":%d" port)))))
(defun efinger--finger-query (account)
"Return the query line to send to the finger server for ACCOUNT."
(let ((user (plist-get account :user)))
(if (and efinger-forward-host (not (string= user "")))
(concat user "@" (plist-get account :host))
user)))
;;;; Networking
(defun efinger--strip-cr (string)
"Return STRING with every carriage return removed."
(replace-regexp-in-string "\r" "" string))
(defun efinger--cancel-timer (process)
"Cancel the connection-timeout timer stored on PROCESS, if any."
(when-let* ((timer (process-get process 'efinger-timer)))
(cancel-timer timer)
(process-put process 'efinger-timer nil)))
(defun efinger--owned-p (process)
"Return non-nil if PROCESS still owns its target buffer."
(let ((buffer (process-get process 'efinger-buffer)))
(and (buffer-live-p buffer)
(eq process (buffer-local-value 'efinger--owner buffer)))))
(defun efinger--report (process message)
"Display MESSAGE from PROCESS in its content buffer and the echo area."
(let ((buffer (process-get process 'efinger-buffer)))
(when (efinger--owned-p process)
(with-current-buffer buffer
(let ((inhibit-read-only t))
(unless efinger--received
(setq efinger--received t)
(delete-region efinger--body-start (point-max)))
(goto-char (point-max))
(insert (propertize message 'face 'efinger-error-face) "\n")))))
(message "efinger: %s" message))
(defun efinger--filter (process string)
"Insert STRING from PROCESS into its content buffer, stripping CRs."
(when (efinger--owned-p process)
(with-current-buffer (process-get process 'efinger-buffer)
(let ((inhibit-read-only t))
(unless efinger--received
(setq efinger--received t)
(delete-region efinger--body-start (point-max)))
(save-excursion
(goto-char (point-max))
(insert (efinger--strip-cr string)))))))
(defun efinger--sentinel (process _event)
"Drive PROCESS through its connection state changes."
(pcase (process-status process)
('open
(efinger--cancel-timer process)
(process-send-string
process (concat (process-get process 'efinger-query) "\r\n")))
('failed
(efinger--cancel-timer process)
(efinger--report
process (format "Could not connect to %s"
(process-get process 'efinger-host))))
('closed
(efinger--cancel-timer process)
(when (and (efinger--owned-p process)
(not (buffer-local-value
'efinger--received
(process-get process 'efinger-buffer))))
(efinger--report process "(no reply)")))))
(defun efinger--timeout (process)
"Abort PROCESS if it is still trying to connect."
(when (and (process-live-p process)
(eq (process-status process) 'connect))
;; Silence the sentinel so the forced deletion is not reported twice.
(set-process-sentinel process #'ignore)
(delete-process process)
(efinger--report
process (format "Connection to %s timed out after %d seconds"
(process-get process 'efinger-host)
efinger-connection-timeout))))
(defun efinger--fetch (host port query buffer)
"Finger QUERY at HOST on PORT, streaming the reply into BUFFER.
Return the network process. The connection is asynchronous, so
Emacs never blocks while the handshake is retried."
(let ((process (make-network-process
:name (format "efinger %s@%s" query host)
:host host
:service port
:nowait t
:coding 'utf-8
:filter #'efinger--filter
:sentinel #'efinger--sentinel)))
(process-put process 'efinger-buffer buffer)
(process-put process 'efinger-query query)
(process-put process 'efinger-host host)
(when efinger-connection-timeout
(process-put process 'efinger-timer
(run-at-time efinger-connection-timeout nil
#'efinger--timeout process)))
process))
(defun efinger--start (buffer account)
"Finger ACCOUNT and render the reply into BUFFER."
(with-current-buffer buffer
(when (process-live-p efinger--owner)
(efinger--cancel-timer efinger--owner)
(set-process-sentinel efinger--owner #'ignore)
(delete-process efinger--owner))
(let ((inhibit-read-only t)
(title (efinger--account-title account)))
(erase-buffer)
(insert (propertize title 'face 'efinger-header-face) "\n")
(insert (make-string (max 12 (length title)) ?─) "\n\n")
(setq efinger--received nil)
(setq efinger--body-start (copy-marker (point)))
(insert (propertize "Fingering…" 'face 'efinger-status-face))
(goto-char (point-min)))
(setq efinger--owner
(efinger--fetch (plist-get account :host)
(plist-get account :port)
(efinger--finger-query account)
buffer))))
;;;; Content buffer (.plan)
(defvar efinger-plan-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "l" #'efinger-back-to-list)
(define-key map "n" #'efinger-plan-next)
(define-key map "p" #'efinger-plan-previous)
(define-key map "g" #'efinger-plan-refresh)
(define-key map "q" #'efinger-quit)
map)
"Keymap for `efinger-plan-mode'.")
(define-derived-mode efinger-plan-mode special-mode "Efinger-Plan"
"Major mode for reading a fingered .plan."
(setq-local truncate-lines nil)
(setq-local header-line-format
" .plan — l back · n/p next/prev · g refresh · q quit")
(buffer-disable-undo))
(defun efinger--plan-buffer ()
"Return the .plan content buffer, creating it if needed."
(let ((buffer (get-buffer-create efinger-plan-buffer-name)))
(with-current-buffer buffer
(unless (derived-mode-p 'efinger-plan-mode)
(efinger-plan-mode)))
buffer))
;;;; Account list
(defvar efinger-list-mode-map
(let ((map (make-sparse-keymap)))
(define-key map "n" #'efinger-next-account)
(define-key map "p" #'efinger-previous-account)
(define-key map (kbd "RET") #'efinger-select)
(define-key map "g" #'efinger-refresh)
(define-key map "G" #'efinger-reload)
(define-key map "q" #'efinger-quit)
map)
"Keymap for `efinger-list-mode'.")
(define-derived-mode efinger-list-mode special-mode "Efinger"
"Major mode for the Efinger account list."
(setq-local truncate-lines t)
(setq-local header-line-format
" Efinger — n/p move · RET open · g refresh · q quit")
(buffer-disable-undo)
(hl-line-mode))
(defun efinger--render-list ()
"Render `efinger--accounts' into the current list buffer."
(let ((inhibit-read-only t))
(erase-buffer)
(if (null efinger--accounts)
(insert (propertize
"No accounts configured. Customize `efinger-accounts'."
'face 'efinger-status-face))
(dolist (account efinger--accounts)
(insert (propertize (plist-get account :label)
'efinger-account account
'face 'efinger-account-face)
"\n")))
(goto-char (point-min))))
(defun efinger--account-at-point ()
"Return the account on the current list line, or nil."
(get-text-property (line-beginning-position) 'efinger-account))
(defun efinger--ensure-plan-window ()
"Ensure the .plan buffer is shown next to the account list."
(let* ((plan-buffer (efinger--plan-buffer))
(list-window (and (buffer-live-p efinger--list-buffer)
(get-buffer-window efinger--list-buffer))))
(or (get-buffer-window plan-buffer)
(if list-window
(with-selected-window list-window
(let ((window (if (eq efinger-layout 'vertical)
(split-window-below efinger-list-height)
(split-window-right efinger-list-width))))
(set-window-buffer window plan-buffer)
window))
(display-buffer plan-buffer)))))
(defun efinger--show-current ()
"Finger the account on the current list line into the .plan pane."
(let ((account (efinger--account-at-point)))
(when account
(efinger--ensure-plan-window)
(efinger--start (efinger--plan-buffer) account))))
;;;; Commands
(defun efinger-next-account ()
"Move to the next account and preview its .plan."
(interactive)
(forward-line 1)
(if (efinger--account-at-point)
(efinger--show-current)
(forward-line -1)))
(defun efinger-previous-account ()
"Move to the previous account and preview its .plan."
(interactive)
(when (> (line-number-at-pos) 1)
(forward-line -1)
(when (efinger--account-at-point)
(efinger--show-current))))
(defun efinger-select ()
"Finger the account at point and move into the .plan pane."
(interactive)
(when (efinger--account-at-point)
(efinger--show-current)
(let ((window (get-buffer-window (efinger--plan-buffer))))
(when window (select-window window)))))
(defun efinger-refresh ()
"Re-finger the account at point."
(interactive)
(efinger--show-current))
(defun efinger-reload ()
"Rebuild the account list from `efinger-accounts'."
(interactive)
(setq efinger--accounts (mapcar #'efinger--parse-account efinger-accounts))
(efinger--render-list)
(efinger--show-current))
(defun efinger-back-to-list ()
"Return focus to the account list."
(interactive)
(if (buffer-live-p efinger--list-buffer)
(let ((window (get-buffer-window efinger--list-buffer)))
(if window
(select-window window)
(switch-to-buffer efinger--list-buffer)))
(message "efinger: no account list")))
(defun efinger--plan-move (n)
"Move N accounts in the list window while staying in the .plan pane."
(let ((window (and (buffer-live-p efinger--list-buffer)
(get-buffer-window efinger--list-buffer))))
(if window
(with-selected-window window
(if (> n 0)
(efinger-next-account)
(efinger-previous-account)))
(message "efinger: no account list"))))
(defun efinger-plan-next ()
"Preview the next account without leaving the .plan pane."
(interactive)
(efinger--plan-move 1))
(defun efinger-plan-previous ()
"Preview the previous account without leaving the .plan pane."
(interactive)
(efinger--plan-move -1))
(defun efinger-plan-refresh ()
"Re-finger the account currently shown in the .plan pane."
(interactive)
(when (buffer-live-p efinger--list-buffer)
(with-current-buffer efinger--list-buffer
(efinger--show-current))))
(defun efinger-quit ()
"Close the account list and the .plan pane."
(interactive)
(let ((plan-buffer (get-buffer efinger-plan-buffer-name))
(list-buffer (get-buffer efinger-list-buffer-name)))
(when plan-buffer
(with-current-buffer plan-buffer
(when (process-live-p efinger--owner)
(efinger--cancel-timer efinger--owner)
(set-process-sentinel efinger--owner #'ignore)
(delete-process efinger--owner)))
(let ((window (get-buffer-window plan-buffer)))
(when (and window (not (one-window-p)))
(delete-window window)))
(kill-buffer plan-buffer))
(when list-buffer
(let ((window (get-buffer-window list-buffer)))
(when (and window (not (one-window-p)))
(delete-window window)))
(kill-buffer list-buffer)))
(setq efinger--list-buffer nil))
;;;; Entry points
;;;###autoload
(defun efinger ()
"Open the Efinger reader over `efinger-accounts'."
(interactive)
(let ((list-buffer (get-buffer-create efinger-list-buffer-name)))
(setq efinger--list-buffer list-buffer)
(with-current-buffer list-buffer
(efinger-list-mode)
(setq efinger--accounts
(mapcar #'efinger--parse-account efinger-accounts))
(efinger--render-list))
(switch-to-buffer list-buffer)
(delete-other-windows)
(goto-char (point-min))
(efinger--show-current)))
;;;###autoload
(defun efinger-finger (target)
"Finger TARGET, a \"[user@]host[:port]\" string, in its own buffer."
(interactive
(list (read-string (format-prompt "Finger" nil))))
(when (string-empty-p (string-trim target))
(user-error "No account given"))
(let* ((account (efinger--parse-target (string-trim target)
(string-trim target)))
(buffer (get-buffer-create
(format "*finger %s*" (efinger--account-title account)))))
(with-current-buffer buffer
(unless (derived-mode-p 'efinger-plan-mode)
(efinger-plan-mode)))
(efinger--start buffer account)
(pop-to-buffer buffer)))
(provide 'efinger)
;;; efinger.el ends here

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;;; efinger-test.el --- Tests for efinger -*- lexical-binding: t; -*-
;; Copyright (C) 2026 Andros Fenollosa
;; SPDX-License-Identifier: GPL-3.0-or-later
;;; Commentary:
;; ERT test suite for efinger.el.
;;
;; The integration tests spin up an ephemeral finger server *inside*
;; Emacs (via `make-network-process' with :server t) so no external
;; program or network access is required. The sample .plan payload is
;; John Carmack's real DOOM source-release announcement, quoted in
;; <https://andros.dev/blog/79c99190/>.
;;
;; Run with:
;; emacs --batch -L . -l test/efinger-test.el -f ert-run-tests-batch-and-exit
;;
;; The blackhole timeout test needs outbound routing and is skipped
;; unless EFINGER_NETWORK_TESTS is set in the environment.
;;; Code:
(require 'ert)
(require 'efinger)
(defconst efinger-test-plan
(concat "-----------------------------------------\r\n"
"John Carmack's .plan for Aug 18, 1997\r\n"
"-----------------------------------------\r\n"
"\r\n"
"I get asked about the DOOM source code every once in a while,\r\n"
"so here is a full status update.\r\n")
"Sample .plan reply, in raw CRLF form, used by the integration tests.")
;;;; Helpers
(defun efinger-test--pump (seconds predicate)
"Run the event loop up to SECONDS until PREDICATE returns non-nil."
(let ((deadline (+ (float-time) seconds)))
(while (and (< (float-time) deadline)
(not (funcall predicate)))
(accept-process-output nil 0.05)
(sit-for 0.01))
(funcall predicate)))
(defun efinger-test--make-server (payload received)
"Start a one-shot finger server that replies with PAYLOAD.
RECEIVED is a one-element vector; the query line the client sends
is stored in its slot 0. Return the server process."
(make-network-process
:name "efinger-test-server"
:server t
:host 'local
:service t
:family 'ipv4
:coding 'utf-8
:filter (lambda (connection string)
(aset received 0 string)
(process-send-string connection payload)
(delete-process connection))))
(defun efinger-test--closed-port ()
"Return a loopback port number with nothing listening on it."
(let* ((server (make-network-process
:name "efinger-test-probe" :server t
:host 'local :service t :family 'ipv4))
(port (process-contact server :service)))
(delete-process server)
port))
;;;; Account parsing
(ert-deftest efinger-test-parse-user-host ()
(let ((account (efinger--parse-account "johnc@idsoftware.com")))
(should (equal (plist-get account :user) "johnc"))
(should (equal (plist-get account :host) "idsoftware.com"))
(should (eql (plist-get account :port) 79))
(should (equal (plist-get account :label) "johnc@idsoftware.com"))))
(ert-deftest efinger-test-parse-labelled-with-port ()
(let ((account (efinger--parse-account
'("Carmack" "johnc@example.com:1079"))))
(should (equal (plist-get account :label) "Carmack"))
(should (equal (plist-get account :user) "johnc"))
(should (equal (plist-get account :host) "example.com"))
(should (eql (plist-get account :port) 1079))))
(ert-deftest efinger-test-parse-host-only ()
(let ((account (efinger--parse-account "happynetbox.com")))
(should (equal (plist-get account :user) ""))
(should (equal (plist-get account :host) "happynetbox.com"))))
(ert-deftest efinger-test-parse-invalid ()
(should-error (efinger--parse-account 42)))
(ert-deftest efinger-test-account-title ()
(should (equal (efinger--account-title
(efinger--parse-account "johnc@idsoftware.com"))
"johnc@idsoftware.com"))
(should (equal (efinger--account-title
(efinger--parse-account "johnc@example.com:1079"))
"johnc@example.com:1079"))
(should (equal (efinger--account-title
(efinger--parse-account "happynetbox.com"))
"happynetbox.com")))
(ert-deftest efinger-test-finger-query ()
(let ((account (efinger--parse-account "johnc@idsoftware.com")))
(let ((efinger-forward-host nil))
(should (equal (efinger--finger-query account) "johnc")))
(let ((efinger-forward-host t))
(should (equal (efinger--finger-query account)
"johnc@idsoftware.com"))))
;; Host-only listing sends an empty query regardless of forwarding.
(let ((account (efinger--parse-account "happynetbox.com"))
(efinger-forward-host t))
(should (equal (efinger--finger-query account) ""))))
(ert-deftest efinger-test-strip-cr ()
(should (equal (efinger--strip-cr "a\r\nb\r\n") "a\nb\n")))
;;;; Integration: async fetch
(ert-deftest efinger-test-fetch-serves-plan ()
"A responding server delivers its .plan into the buffer, CRs stripped."
(let* ((received (make-vector 1 nil))
(server (efinger-test--make-server efinger-test-plan received))
(port (process-contact server :service))
(buffer (generate-new-buffer " *efinger-test-plan*")))
(unwind-protect
(progn
(with-current-buffer buffer (efinger-plan-mode))
(efinger--start
buffer (list :label "test" :user "johnc"
:host "127.0.0.1" :port port))
(should (efinger-test--pump
5 (lambda ()
(with-current-buffer buffer
(string-match-p "status update" (buffer-string))))))
;; The bare username reached the server.
(should (equal (string-trim (aref received 0)) "johnc"))
(with-current-buffer buffer
(should (string-match-p "John Carmack's .plan" (buffer-string)))
;; Header title is present and CRs are gone.
(should (string-prefix-p "johnc@127.0.0.1" (buffer-string)))
(should-not (string-match-p "\r" (buffer-string)))
;; The transient status placeholder was replaced.
(should-not (string-match-p "Fingering" (buffer-string)))))
(when (process-live-p server) (delete-process server))
(kill-buffer buffer))))
(ert-deftest efinger-test-fetch-connection-refused ()
"A refused connection is reported gracefully, without a backtrace."
(let ((buffer (generate-new-buffer " *efinger-test-refused*"))
(port (efinger-test--closed-port))
(efinger-connection-timeout 3))
(unwind-protect
(progn
(with-current-buffer buffer (efinger-plan-mode))
(efinger--start
buffer (list :label "x" :user "x" :host "127.0.0.1" :port port))
(should (efinger-test--pump
5 (lambda ()
(with-current-buffer buffer
(string-match-p "Could not connect\\|timed out"
(buffer-string))))))
(with-current-buffer buffer
(should (string-match-p "Could not connect" (buffer-string)))))
(kill-buffer buffer))))
(ert-deftest efinger-test-fetch-returns-immediately ()
"The async fetch returns control at once, whatever the host does."
(let ((buffer (generate-new-buffer " *efinger-test-immediate*"))
(port (efinger-test--closed-port))
(efinger-connection-timeout 10))
(unwind-protect
(let* ((start (float-time))
(_ (with-current-buffer buffer (efinger-plan-mode)))
(proc (efinger--start
buffer
(list :label "x" :user "x" :host "127.0.0.1" :port port)))
(elapsed (- (float-time) start)))
(should (< elapsed 1.0))
(should (eq (process-status proc) 'connect)))
(kill-buffer buffer))))
(ert-deftest efinger-test-timeout ()
"A silent host is abandoned after `efinger-connection-timeout' seconds."
(skip-unless (getenv "EFINGER_NETWORK_TESTS"))
(let ((buffer (generate-new-buffer " *efinger-test-timeout*"))
(efinger-connection-timeout 2))
(unwind-protect
(progn
(with-current-buffer buffer (efinger-plan-mode))
(efinger--start
buffer (list :label "bh" :user "x" :host "10.255.255.1" :port 79))
(should (efinger-test--pump
6 (lambda ()
(with-current-buffer buffer
(string-match-p "timed out" (buffer-string)))))))
(kill-buffer buffer))))
(ert-deftest efinger-test-live-happynetbox ()
"Optional live check against a real public finger server."
(skip-unless (getenv "EFINGER_NETWORK_TESTS"))
(let ((buffer (generate-new-buffer " *efinger-test-live*")))
(unwind-protect
(progn
(with-current-buffer buffer (efinger-plan-mode))
(efinger--start
buffer (efinger--parse-account "random@happynetbox.com"))
(should (efinger-test--pump
15 (lambda ()
(with-current-buffer buffer
(> (- (point-max) (point-min)) 60))))))
(kill-buffer buffer))))
(provide 'efinger-test)
;;; efinger-test.el ends here