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+;;; password-store.el --- Password store (pass) support
+
+;; Copyright (C) 2014 Svend Sorensen <svend@ciffer.net>
+
+;; Author: Svend Sorensen <svend@ciffer.net>
+;; Version: 0.1
+;; Package-Requires: ((f "0.11.0") (s "1.9.0"))
+;; Keywords: pass
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; This package provides functions for working with pass ("the
+;; standard Unix password manager").
+;;
+;; http://www.zx2c4.com/projects/password-store/
+
+;;; Code:
+
+(require 'f)
+(require 's)
+
+(defvar pass-executable
+ (executable-find "pass")
+ "Pass executable.")
+
+(defconst password-store-password-length 8
+ "Default password length.")
+
+(defconst password-store-timeout 45
+ "Number of seconds to wait before clearing the password.")
+
+(defun password-store--run (&rest args)
+ "Run pass with ARGS.
+
+Returns the output on success, or outputs error message on
+failure."
+ (with-temp-buffer
+ (let ((exit-code
+ (apply 'call-process
+ (append
+ (list pass-executable nil (current-buffer) nil)
+ args))))
+ (if (zerop exit-code)
+ (buffer-string)
+ (error (s-chomp (buffer-string)))))))
+
+(defvar password-store-kill-ring-pointer nil
+ "The tail of of the kill ring ring whose car is the password.")
+
+(defun password-store-dir ()
+ "Return password store directory."
+ (or (getenv "PASSWORD_STORE_DIR")
+ "~/.password-store"))
+
+(defun password-store--entry-to-file (entry)
+ "Return file name corresponding to ENTRY."
+ (concat (f-join (password-store-dir) entry) ".gpg"))
+
+(defun password-store--file-to-entry (file)
+ "Return entry name corresponding to FILE."
+ (f-no-ext (f-relative file (password-store-dir))))
+
+(defun password-store-list (&optional subdir)
+ "List password entries under SUBDIR."
+ (unless subdir (setq subdir ""))
+ (let ((dir (f-join (password-store-dir) subdir)))
+ (if (f-directory? dir)
+ (mapcar 'password-store--file-to-entry
+ (f-files dir (lambda (file) (equal (f-ext file) "gpg")) t)))))
+
+;;;###autoload
+(defun password-store-edit (entry)
+ "Edit password for ENTRY.
+
+This edits the password file directly in Emacs, so changes will
+need to be commited manually if git is being used."
+ (interactive (list (completing-read "Password entry: " (password-store-list))))
+ (find-file (password-store--entry-to-file entry)))
+
+;;;###autoload
+(defun password-store-get (entry)
+ "Return password for ENTRY.
+
+Returns the first line of the password data."
+ (car (s-lines (password-store--run "show" entry))))
+
+;;;###autoload
+(defun password-store-clear ()
+ "Clear password in kill ring."
+ (interactive)
+ (if password-store-kill-ring-pointer
+ (progn
+ (setcar password-store-kill-ring-pointer "")
+ (setq password-store-kill-ring-pointer nil)
+ (message "Password cleared."))))
+
+;;;###autoload
+(defun password-store-copy (entry)
+ "Add password for ENTRY to kill ring.
+
+Clear previous password from kill ring. Pointer to kill ring is
+stored in `password-store-kill-ring-pointer'. Password is cleared
+after `password-store-timeout' seconds."
+ (interactive (list (completing-read "Password entry: " (password-store-list))))
+ (let ((password (password-store-get entry)))
+ (password-store-clear)
+ (kill-new password)
+ (setq password-store-kill-ring-pointer kill-ring-yank-pointer)
+ (message "Copied %s to the kill ring. Will clear in %s seconds." entry password-store-timeout)
+ (run-at-time password-store-timeout nil 'password-store-clear)))
+
+;;;###autoload
+(defun password-store-generate (entry &optional password-length)
+ "Generate a new password for ENTRY with PASSWORD-LENGTH.
+
+Default PASSWORD-LENGTH is `password-store-password-length'."
+ (interactive (list (read-string "Password entry: ")
+ (when current-prefix-arg
+ (abs (prefix-numeric-value current-prefix-arg)))))
+ (unless password-length (setq password-length password-store-password-length))
+ ;; A message with the output of the command is not printed because
+ ;; the output contains the password.
+ (password-store--run "generate" "-f" entry (number-to-string password-length))
+ nil)
+
+;;;###autoload
+(defun password-store-insert (entry password)
+ "Insert a new ENTRY containing PASSWORD."
+ (interactive (list (read-string "Password entry: ")
+ (read-passwd "Password: " t)))
+ (message (s-chomp (shell-command-to-string (format "echo %s | %s insert -m -f %s" password pass-executable entry)))))
+
+;;;###autoload
+(defun password-store-remove (entry)
+ "Remove existing password for ENTRY."
+ (interactive (list (completing-read "Password entry: " (password-store-list))))
+ (message (s-chomp (password-store--run "rm" "-f" entry))))
+
+;;;###autoload
+(defun password-store-url (entry)
+ "Browse URL stored in ENTRY.
+
+This will only browse URLs that start with http:// or http:// to
+avoid sending a password to the browser."
+ (interactive (list (completing-read "Password entry: " (password-store-list))))
+ (let ((url (password-store-get entry)))
+ (if (or (string-prefix-p "http://" url)
+ (string-prefix-p "https://" url))
+ (browse-url url)
+ (error "%s" "String does not look like a URL"))))
+
+;;;###autoload
+(defun password-store-version ()
+ "Show version of pass executable."
+ (interactive)
+ (message (s-chomp (password-store--run "version"))))
+
+;;; password-store.el ends here