Squashed 'init-packages/' content from commit 09a4b6e
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init-packages.el
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init-packages.el
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;;; init-packages.el --- Helpful automation functions for `package'
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;; Copyright (C) 2017 Wojciech Kozlowski
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;; Author: Wojciech Kozlowski <wojciech.kozlowski@vivaldi.net>
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;; Created: 23 Aug 2017
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;; Version: 0.0.1
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;; Keywords: tools
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;; Package-Requires:
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;; This file is not part of GNU Emacs.
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;;; Commentary:
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;; This package serves to help further automate package management with
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;; `package'. The aim of this package is to expose a simple API which when
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;; provided with a list of desired packages will (i) install them and remove
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;; any redundant packages, (ii) update them, (iii) rollback updates.
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;; Currently only (i) is implemented.
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;;; Code:
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(require 'package)
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(require 'cl)
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(defgroup init-packages nil
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"Further automate working with `package'"
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:group 'applications)
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;;; Customization options
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(defcustom init-packages-print-logs t
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"This variable determines if `init-packages' prints any logs."
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:type 'boolean)
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(defcustom init-packages-log "*Init-Packages-Log*"
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"Buffer to which logs will be printed by `init-packages'.
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This buffer will be erased whenever \\[init-packages-init] is
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called."
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:type 'string)
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(defcustom init-packages-error-log "*Init-Packages-Error-Log*"
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"Buffer to which error logs will be printed by `init-packages'.
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This buffer will be erased whenever \\[init-packages-init] is
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called."
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:type 'string)
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(defcustom init-packages-install-attempts 2
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"How many times to attempt a package installation.
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This only matters if for some reason a package fails to install
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on the first attempt. Sometimes re-attempting the installation
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may fix the problem. Note that subsequent attempts are only made
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after attempting to install all other packages first."
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:type 'integer)
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;;; Print functions
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(defun init-packages-erase-logs ()
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"Erase both log buffers."
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(when init-packages-print-logs
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;; Erase `init-packages-log'.
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(save-excursion
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(set-buffer (get-buffer-create init-packages-log))
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(erase-buffer)
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(goto-char (point-min)))
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;; Erase `init-packages-error-log'.
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(save-excursion
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(set-buffer (get-buffer-create init-packages-error-log))
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(erase-buffer)
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(goto-char (point-min)))))
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(defun init-packages-print (string buffer)
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"Print STRING to BUFFER."
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(when init-packages-print-logs
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(save-excursion
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(set-buffer (get-buffer-create buffer))
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(goto-char (point-max))
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(if (not (= (point) 1))
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(newline))
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(insert string))))
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(defun init-packages-print-format (fmt pkg buffer)
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"Print string of FMT about PKG to BUFFER"
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(or (stringp pkg)
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(setq pkg (symbol-name pkg)))
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(init-packages-print (format fmt pkg) buffer))
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(defun init-packages-print-installing (pkg)
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"Print a log message about installing PKG."
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(init-packages-print-format "Installing: %s" pkg init-packages-log))
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(defun init-packages-print-deleting (pkg)
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"Print a log message about deleting PKG."
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(init-packages-print-format "Deleting: %s" pkg init-packages-log))
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(defun init-packages-print-failed (logstrbase pkg)
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"Print a log message about failed operation of PKG."
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(let* ((logstr (concat logstrbase
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(format " (see %s for details)"
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init-packages-error-log)))
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(errstr (concat "*** " logstrbase " ***")))
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(init-packages-print-format logstr pkg init-packages-log)
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(init-packages-print-format errstr pkg init-packages-error-log)))
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(defun init-packages-print-failed-install (pkg)
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"Print a log message about failed installation of PKG."
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(init-packages-print-failed "Failed to install: %s" pkg))
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(defun init-packages-print-failed-delete (pkg)
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"Print a log message about failed deletion of PKG."
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(init-packages-print-failed "Failed to delete: %s" pkg))
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(defun init-packages-print-log (string)
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"Print STRING to `init-packages-log'."
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(init-packages-print string init-packages-log))
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(defun init-packages-print-error-log (string)
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"Print STRING to `init-packages-error-log'."
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(init-packages-print string init-packages-error-log))
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;;; Helper functions
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(defun init-packages-install-pkgs (install-pkgs)
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"Install all packages in INSTALL-PKGS.
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Log errors to `init-packages-error-log'."
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(dolist (p install-pkgs nil)
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(init-packages-print-installing p)
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(condition-case err
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(package-install p)
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(error (progn
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(init-packages-print-failed-install p)
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(init-packages-print-error-log (error-message-string err)))))))
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(defun init-packages-delete-pkgs (delete-pkgs)
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"Delete all packages in DELETE-PKGS.
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This will attempt to delete all installed versions. Log errors
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to `init-packages-error-log'. This assumes all DELETE-PKGS can
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be removed, including packages that are dependencies as it is
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assumed they would not be dependencies once all packages in
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DELETE-PKGS are removed."
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(dolist (p delete-pkgs nil)
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(init-packages-print-deleting p)
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(condition-case err
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(package-delete (cadr (assq p package-alist)) t)
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(error (progn
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(init-packages-print-failed-install p)
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(init-packages-print-error-log (error-message-string err)))))))
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(defun init-packages-removable-packages (pkgs)
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"Return a list of names of packages no longer needed.
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These are packages which are neither contained in PKGS nor a
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dependency of one that is."
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(let ((needed (cl-loop for p in pkgs
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if (assq p package-alist)
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;; `p' and its dependencies are needed.
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append (cons p (package--get-deps p)))))
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(cl-loop for p in (mapcar #'car package-alist)
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unless (memq p needed)
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collect p)))
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;;; Operational functions:
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;; These functions are expected to be called from the init file.
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(defun init-packages-init (desired-pkgs &optional no-set-selected)
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"Install DESIRED-PKGS and remove redundant packages.
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First, any missing packages will be installed followed by the
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deletion of all packages that are not dependencies of anything in
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DESIRED-PKGS. Information logs will be printed to the
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`init-packages-log' buffer whilst error messages will be printed
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to the `init-packages-error-log' buffer. Finally the
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`package-selected-packages' custom variable will be set to
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DESIRED-PKGS unless NO-SET-SELECTED is non-nil"
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;; Erase log buffers.
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(init-packages-erase-logs)
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;; Check if `package' initialized.
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(when (not package--initialized)
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(let ((err-str "`package' not initialized"))
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(init-packages-print-error-log err-str)
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(error err-str)))
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;; Install packages. If any packages fail to install, re-attempt up to
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;; `init-packages-install-attempts' total attempts.
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(let ((attempt 0))
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(while (and (< attempt init-packages-install-attempts)
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(setq install-pkgs
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(remove-if #'package-installed-p desired-pkgs)))
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(if (= attempt 0)
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(progn
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(init-packages-print-log "*** Install packages ***")
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(init-packages-print-log "--- Refreshing package archives ---")
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(package-refresh-contents))
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(init-packages-print-log
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"--- Re-attempt installation of failed packages ---"))
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(init-packages-install-pkgs install-pkgs)
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(setq attempt (1+ attempt))))
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;; Print an error message if not all packages were installed.
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(let ((failed-pkgs (remove-if #'package-installed-p desired-pkgs)))
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(when failed-pkgs
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(init-packages-print-error-log
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"*** WARNING: NOT ALL PACKAGES WERE INSTALLED ***")
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(init-packages-print-error-log "--- Packages not installed: ")
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(init-packages-print-error-log
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(mapconcat #'symbol-name failed-pkgs ", "))))
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;; Remove packages.
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(let ((delete-pkgs (init-packages-removable-packages desired-pkgs)))
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(when delete-pkgs
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(init-packages-print-log "*** Delete packages ***")
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(init-packages-delete-pkgs delete-pkgs)))
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(unless no-set-selected
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(customize-save-variable 'package-selected-packages desired-pkgs)))
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(provide 'init-packages)
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;;; init-packages.el ends here
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