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;;; haskell-session.el --- Haskell sessions
;; Copyright (C) 2011-2012 Chris Done
;; Author: Chris Done <chrisdone@gmail.com>
;; This file is not part of GNU Emacs.
;; This file 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, or (at your option)
;; any later version.
;; This file 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 GNU Emacs; see the file COPYING. If not, write to
;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Todo:
;;; Code:
(require 'cl-lib)
(require 'haskell-cabal)
(require 'haskell-string)
(require 'haskell-customize)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Globals
;; Used internally
(defvar haskell-session)
(make-variable-buffer-local 'haskell-session)
(defvar haskell-sessions (list)
"All Haskell sessions in the Emacs session.")
(defun haskell-session-tags-filename (session)
"Get the filename for the TAGS file."
(concat (haskell-session-cabal-dir session) "/TAGS"))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Finding/clearing the session
;;;###autoload
(defun haskell-session-maybe ()
"Maybe get the Haskell session, return nil if there isn't one."
(if (default-boundp 'haskell-session)
haskell-session
(setq haskell-session nil)))
(defun haskell-session-from-buffer ()
"Get the session based on the buffer."
(when (and (buffer-file-name)
(consp haskell-sessions))
(cl-reduce (lambda (acc a)
(let ((dir (haskell-session-cabal-dir a t)))
(if dir
(if (string-prefix-p dir
(file-name-directory (buffer-file-name)))
(if acc
(if (and
(> (length (haskell-session-cabal-dir a t))
(length (haskell-session-cabal-dir acc t))))
a
acc)
a)
acc)
acc)))
haskell-sessions
:initial-value nil)))
(defun haskell-session-default-name ()
"Generate a default project name for the new project prompt."
(let ((file (haskell-cabal-find-file)))
(or (when file
(downcase (file-name-sans-extension
(file-name-nondirectory file))))
"haskell")))
(defun haskell-session-assign (session)
"Set the current session."
(set (make-local-variable 'haskell-session) session))
(defun haskell-session-choose ()
"Find a session by choosing from a list of the current sessions."
(when haskell-sessions
(let* ((session-name (funcall haskell-completing-read-function
"Choose Haskell session: "
(cl-remove-if (lambda (name)
(and haskell-session
(string= (haskell-session-name haskell-session)
name)))
(mapcar 'haskell-session-name haskell-sessions))))
(session (cl-find-if (lambda (session)
(string= (haskell-session-name session)
session-name))
haskell-sessions)))
session)))
(defun haskell-session-clear ()
"Clear the buffer of any Haskell session choice."
(set (make-local-variable 'haskell-session) nil))
(defun haskell-session-lookup (name)
"Get the session by name."
(cl-remove-if-not (lambda (s)
(string= name (haskell-session-name s)))
haskell-sessions))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Session modules
(defun haskell-session-strip-dir (session file)
"Strip the load dir from the file path."
(let ((cur-dir (haskell-session-current-dir session)))
(if (> (length file) (length cur-dir))
(if (string= (substring file 0 (length cur-dir))
cur-dir)
(replace-regexp-in-string
"^[/\\]" ""
(substring file
(length cur-dir)))
file)
file)))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Accessing the session
(defun haskell-session-current-dir (s)
"Get the session current directory."
(let ((dir (haskell-session-get s 'current-dir)))
(or dir
(error "No current directory."))))
(defun haskell-session-name (s)
"Get the session name."
(haskell-session-get s 'name))
(defun haskell-session-target (s)
"Get the session build target."
(let* ((maybe-target (haskell-session-get s 'target))
(target (if maybe-target maybe-target
(let ((new-target
(read-string "build target (empty for default):")))
(haskell-session-set-target s new-target)))))
(if (not (string= target "")) target nil)))
(defun haskell-session-set-target (s target)
"Set the session build target."
(haskell-session-set s 'target target))
(defun haskell-session-set-interactive-buffer (s v)
"Set the session interactive buffer."
(haskell-session-set s 'interactive-buffer v))
(defun haskell-session-set-process (s v)
"Set the session process."
(haskell-session-set s 'process v))
;;;###autoload
(defun haskell-session-process (s)
"Get the session process."
(haskell-session-get s 'process))
(defun haskell-session-set-cabal-dir (s v)
"Set the session cabal-dir."
(let ((true-path (file-truename v)))
(haskell-session-set s 'cabal-dir true-path)
(haskell-session-set-cabal-checksum s true-path)))
(defun haskell-session-set-current-dir (s v)
"Set the session current directory."
(let ((true-path (file-truename v)))
(haskell-session-set s 'current-dir true-path)))
(defun haskell-session-set-cabal-checksum (s cabal-dir)
"Set the session checksum of .cabal files"
(haskell-session-set s 'cabal-checksum
(haskell-cabal-compute-checksum cabal-dir)))
(defun haskell-session-cabal-dir (s &optional no-prompt)
"Get the session cabal-dir."
(let ((dir (haskell-session-get s 'cabal-dir)))
(if dir
dir
(unless no-prompt
(let ((set-dir (haskell-cabal-get-dir)))
(if set-dir
(progn (haskell-session-set-cabal-dir s set-dir)
set-dir)
(haskell-session-cabal-dir s)))))))
(defun haskell-session-modify (session key update)
"Update the value at KEY in SESSION with UPDATE."
(haskell-session-set
session
key
(funcall update
(haskell-session-get session key))))
(defun haskell-session-get (session key)
"Get the SESSION's KEY value.
Returns nil if KEY not set."
(cdr (assq key session)))
(defun haskell-session-set (session key value)
"Set the SESSION's KEY to VALUE.
Returns newly set VALUE."
(let ((cell (assq key session)))
(if cell
(setcdr cell value) ; modify cell in-place
(setcdr session (cons (cons key value) (cdr session))) ; new cell
value)))
(provide 'haskell-session)
;;; haskell-session.el ends here
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