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;;; haskell-modules.el --- -*- lexical-binding: t -*-
;; Copyright (c) 2014 Chris Done. All rights reserved.
;; 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 this program. If not, see <http://www.gnu.org/licenses/>.
;;; Code:
(require 'haskell-sort-imports)
(require 'haskell-align-imports)
(require 'haskell-session)
(require 'haskell-navigate-imports)
(require 'haskell-complete-module)
(require 'haskell-sandbox)
(require 'haskell-customize)
(defun haskell-add-import (&optional module)
"Add an import to the import list. Sorts and aligns imports,
unless `haskell-stylish-on-save' is set, in which case we defer
to stylish-haskell."
(interactive)
(save-excursion
(goto-char (point-max))
(haskell-navigate-imports)
(insert (haskell-import-for-module
(or module
(haskell-complete-module-read
"Module: "
(haskell-session-all-modules (haskell-modules-session))))))
(unless haskell-stylish-on-save (haskell-sort-imports)
(haskell-align-imports))))
(defun haskell-import-for-module (module)
"Get import statements for the given module."
(let ((mapping (assoc module haskell-import-mapping)))
(if mapping
(cdr mapping)
(concat (read-from-minibuffer "Import line: "
(format "import %s" module))
"\n"))))
;;;###autoload
(defun haskell-session-installed-modules (_session &optional _dontcreate)
"Get the modules installed in the current package set."
;; TODO: Again, this makes HEAVY use of unix utilities. It'll work
;; fine in Linux, probably okay on OS X, and probably not at all on
;; Windows. Again, if someone wants to test on Windows and come up
;; with alternatives that's OK.
;;
;; Ideally all these package queries can be provided by a Haskell
;; program based on the Cabal API. Possibly as a nice service. Such
;; a service could cache and do nice things like that. For now, this
;; simple shell script takes us far.
;;
;; Probably also we can take the code from inferior-haskell-mode.
;;
;; Ugliness aside, if it saves us time to type it's a winner.
;;
;; FIXME/TODO: add support for (eq 'cabal-repl (haskell-process-type))
(let ((session (haskell-session-maybe)))
(when session
(let ((modules (shell-command-to-string
(format "%s 2> /dev/null | %s | %s"
(cond
((haskell-sandbox-exists-p session)
(concat "ghc-pkg dump -f "
(shell-quote-argument (haskell-sandbox-pkgdb session))))
(t "ghc-pkg dump"))
"egrep '^(exposed-modules: | )[A-Z]'"
"cut -c18-"))))
(split-string modules)))))
;;;###autoload
(defun haskell-session-all-modules (session &optional dontcreate)
"Get all modules -- installed or in the current project.
If DONTCREATE is non-nil don't create a new session."
(append (haskell-session-installed-modules session dontcreate)
(haskell-session-project-modules session dontcreate)))
;;;###autoload
(defun haskell-session-project-modules (session &optional dontcreate)
"Get the modules of the current project.
If DONTCREATE is non-nil don't create a new session."
(if (or (not dontcreate) (haskell-session-maybe))
(let* ((modules
(shell-command-to-string
(format "%s && %s"
(format "cd %s" (haskell-session-cabal-dir session))
;; TODO: Use a different, better source. Possibly hasktags or some such.
;; TODO: At least make it cross-platform. Linux
;; (and possibly OS X) have egrep, Windows
;; doesn't -- or does it via Cygwin or MinGW?
;; This also doesn't handle module\nName. But those gits can just cut it out!
"egrep '^module[\t\r ]+[^(\t\r ]+' . -r -I --include='*.*hs' --include='*.hsc' -s -o -h | sed 's/^module[\t\r ]*//' | sort | uniq"))))
(split-string modules))))
(defun haskell-modules-session ()
"Get the `haskell-session', throw an error if it's not
available."
(or (haskell-session-maybe)
(haskell-session-assign
(or (haskell-session-from-buffer)
(haskell-session-choose)
(error "No session associated with this buffer. Try M-x haskell-session-change or report this as a bug.")))))
(provide 'haskell-modules)
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