Remove dependency on f.el

Some non-Linux systems do not have a `/sys/` directory. Therefore,
check it only if we are in a Linux system.

Fixes #19

README.org

@@ -22,6 +22,7 @@ macOS. PR are welcome if you want to fix that!
 * Table of Contents                                                :TOC_2_gh:
 - [[#introduction][Introduction]]
 - [[#recent-breaking-changes][Recent Breaking Changes]]
+  - [[#081][~0.8.1~]]
   - [[#070][~0.7.0~]]
 - [[#installation][Installation]]
 - [[#customizing][Customizing]]
@@ -33,6 +34,11 @@ macOS. PR are welcome if you want to fix that!
 - [[#license][License]]
 
 * Recent Breaking Changes
+** ~0.8.1~
+Version ~0.8.1~ removes the optional argument ~REMOTE~ from
+~eshell-info-banner--executable-find~. It now only acts according to the
+user’s preference set with ~eshell-info-banner-tramp-aware~.
+
 ** ~0.7.0~
 Version ~0.7.0~ renames several functions to conform with the Elisp
 Coding Conventions.

eshell-info-banner.el

@@ -2,8 +2,8 @@
 
 ;; Author: Lucien Cartier-Tilet <lucien@phundrak.com>
 ;; Maintainer: Lucien Cartier-Tilet <lucien@phundrak.com>
-;; Version: 0.8.0
-;; Package-Requires: ((emacs "25.1") (f "0.20") (s "1"))
+;; Version: 0.8.5
+;; Package-Requires: ((emacs "25.1") (s "1"))
 ;; Homepage: https://github.com/Phundrak/eshell-info-banner.el
 
 ;; This file is not part of GNU Emacs
@@ -60,12 +60,20 @@
                                         ;              Constants              ;
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
+(defconst eshell-info-banner-path-separator
+  (substring-no-properties (file-relative-name (expand-file-name "x" "y")) 1 2)
+  "File separator used by the current operating system.")
+
 (defconst eshell-info-banner--min-length-left 8
   "Minimum length of text on the left hand side of the banner.")
 
 (eval-when-compile
   (defconst eshell-info-banner--macos-versions
-    '(("10.4"  . "Mac OS X Tiger")
+    '(("10.0"  . "Mac OS X Cheetah")
+      ("10.1"  . "Mac OS X Puma")
+      ("10.2"  . "Mac OS X Jaguar")
+      ("10.3"  . "Mac OS X Panther")
+      ("10.4"  . "Mac OS X Tiger")
       ("10.5"  . "Mac OS X Leopard")
       ("10.6"  . "Mac OS X Snow Leopard")
       ("10.7"  . "Mac OS X Lion")
@@ -84,9 +92,15 @@
       ("11.3"  . "macOS Big Sur")
       ("11.4"  . "macOS Big Sur")
       ("11.5"  . "macOS Big Sur")
-      ("11.6"  . "macOS Big Sur"))
+      ("11.6"  . "macOS Big Sur")
+      ("12.0"  . "macOS Monterey")
+      ("12.1"  . "macOS Monterey")
+      ("12.2"  . "macOS Monterey"))
     "Versions of OSX and macOS and their name."))
 
+(defconst eshell-info-banner--posix-shells '("bash" "zsh" "sh")
+  "List of POSIX-compliant shells to run external commands through.")
+
 
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
                                         ;           Custom variables          ;
@@ -140,18 +154,18 @@
   :type 'list
   :version "0.3.0")
 
-(defun eshell-info-banner--executable-find (program &optional remote)
-  "Find PROGRAM executable, possibly on a REMOTE machine.
+(defun eshell-info-banner--executable-find (program)
+  "Find PROGRAM executable, possibly on a remote machine.
 This is a wrapper around `executable-find' in order to avoid
 issues with older versions of the functions only accepting one
-argument."
+argument. `executable-find'’s remote argument has the value of
+`eshell-info-banner-tramp-aware'."
   (if (version< emacs-version "27.1")
-      (let ((default-directory (if (and eshell-info-banner-tramp-aware
-                                        remote)
+      (let ((default-directory (if eshell-info-banner-tramp-aware
                                    default-directory
                                  "~")))
         (executable-find program))
-    (executable-find program remote)))
+    (executable-find program eshell-info-banner-tramp-aware)))
 
 (defcustom eshell-info-banner-duf-executable "duf"
   "Path to the `duf' executable."
@@ -209,19 +223,27 @@ argument."
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 
 (defmacro eshell-info-banner--with-face (str &rest properties)
-  "Helper macro for applying face `PROPERTIES' to `STR'."
+  "Helper macro for applying face PROPERTIES to STR."
   `(propertize ,str 'face (list ,@properties)))
 
 (defun eshell-info-banner--shell-command-to-string (command)
   "Execute shell command COMMAND and return its output as a string.
 Ensures the command is ran with LANG=C."
-  (shell-command-to-string (format "LANG=C %s" command)))
+  (let ((shell (or (seq-find (lambda (shell)
+                              (eshell-info-banner--executable-find shell))
+                            eshell-info-banner--posix-shells)
+                  "sh")))
+    (with-temp-buffer
+      (call-process shell nil t nil "-c" (concat "LANG=C " command))
+      (buffer-string))))
 
 (defun eshell-info-banner--progress-bar-without-prefix (bar-length used total &optional newline)
   "Display a progress bar without its prefix.
 Display a progress bar of BAR-LENGTH length, followed by an
 indication of how full the memory is with a human readable USED
-and TOTAL size."
+and TOTAL size.
+Optional argument NEWLINE: Whether to output a newline at the end
+of the progress bar."
   (let ((percentage (if (= used 0)
                         0
                       (/ (* 100 used) total))))
@@ -267,7 +289,7 @@ If the executable `uptime' is not found, return nil."
   path size used percent)
 
 (defun eshell-info-banner--get-longest-path (partitions)
-  "Return the length of the longest partition path in `PARTITIONS'.
+  "Return the length of the longest partition path in PARTITIONS.
 
 The returned value is in any case greater than
 `eshell-info-banner--min-length-left'."
@@ -277,34 +299,43 @@ The returned value is in any case greater than
                         (length (eshell-info-banner--mounted-partitions-path partition)))))))
 
 (defun eshell-info-banner--abbr-path (path &optional abbr)
-  "Remove `$HOME' from `PATH', abbreviate parent dirs if `ABBR' non nil.
+  "Remove `$HOME' from PATH, abbreviate parent dirs if ABBR non nil.
 
-Abbreviate `PATH' by removing the value of `HOME' if it is
-present in the former, and if `ABBR' is t then all parent
-directories of the current `PATH' are abbreviated to only one
-character.  If an abbreviated directory starts with a dot, then
-include it before the abbreviated name of the directory,
-e.g. \".config\" -> \".c\".
+Abbreviate PATH by removing the value of HOME if it is present in
+the former, and if ABBR is t then all parent directories of the
+current PATH are abbreviated to only one character. If an
+abbreviated directory starts with a dot, then include it before
+the abbreviated name of the directory, e.g. \".config\" ->
+\".c\".
 
-For public use, `PATH' should be a string representing a UNIX
-path.  For internal use, `PATH' can also be a list. If `PATH' is
-neither of these, an error will be thrown by the function."
+For public use, PATH should be a string representing a UNIX path.
+For internal use, PATH can also be a list. If PATH is neither of
+these, an error will be thrown by the function."
   (cond
-   ((stringp path) (abbreviate-file-name
-                    (if abbr
-                        (eshell-info-banner--abbr-path
-                         (f-split (eshell-info-banner--abbr-path path)))
-                      path)))
+   ((stringp path)
+    (let ((abbr-path (abbreviate-file-name path)))
+      (if abbr
+          (abbreviate-file-name
+           (eshell-info-banner--abbr-path
+            (split-string abbr-path eshell-info-banner-path-separator t)))
+        abbr-path)))
    ((null path) "")
    ((listp path)
-    (f-join (if (= (length path) 1)
-                (car path)
-              (let* ((dir        (car path))
-                     (first-char (substring dir 0 1)))
-                (if (string= "." first-char)
-                    (substring dir 0 2)
-                  first-char)))
-            (eshell-info-banner--abbr-path (cdr path))))
+    (let ((file (eshell-info-banner--abbr-path (cdr path)))
+          (directory (if (= (length path) 1)
+                         (car path)
+                       (let* ((dir        (car path))
+                              (first-char (substring dir 0 1)))
+                         (if (string= "." first-char)
+                             (substring dir 0 2)
+                           first-char)))))
+       (if (string= "" file)
+           directory
+         (let ((relative-p (not (file-name-absolute-p directory)))
+               (new-dir    (expand-file-name file directory)))
+           (if relative-p
+               (file-relative-name new-dir)
+             new-dir)))))
    (t (error "Invalid argument %s, neither stringp or listp" path))))
 
 (defun eshell-info-banner--get-mounted-partitions-duf ()
@@ -413,7 +444,7 @@ Return detected partitions as a list of structs."
          nil)))))
 
 (defun eshell-info-banner--partition-to-string (partition text-padding bar-length)
-  "Display a progress bar showing how full a `PARTITION' is.
+  "Display a progress bar showing how full a PARTITION is.
 
 For TEXT-PADDING and BAR-LENGTH, see the documentation of
 `eshell-info-banner--display-memory'."
@@ -451,19 +482,80 @@ For TEXT-PADDING and BAR-LENGTH, see the documentation of
                         "\n"
                         t)))
 
-(defun eshell-info-banner--get-memory-unix ()
-  "Get memory usage for UNIX systems.
-Compatible with Darwin and FreeBSD at least."
-  (let* ((command-to-mem (lambda (command)
-                           (string-to-number
+(defun eshell-info-banner--get-memory-unix-command-to-mem (command)
+  "Get the output of COMMAND corresponding to memory information.
+This function is to be only used on platforms which support sysctl."
+  (string-to-number
+   (s-trim
+    (car (last
+          (split-string (eshell-info-banner--shell-command-to-string command)
+                        " "
+                        t))))))
+
+(defun eshell-info-banner--get-memory-netbsd ()
+  "Get memory usage for NetBSD systems.
+See `eshell-info-banner--get-memory'."
+  (let* ((total (eshell-info-banner--get-memory-unix-command-to-mem "sysctl hw.physmem64"))
+         (used  (- total
+                   (* 1024 (string-to-number
                             (s-trim
-                             (cadr
-                              (split-string (eshell-info-banner--shell-command-to-string command)
-                                            " "
-                                            t)))))))
-    `(("RAM"
-       ,(apply command-to-mem '("sysctl hw.physmem"))
-       ,(apply command-to-mem '("sysctl hw.usermem"))))))
+                             (with-temp-buffer
+                               (insert-file-contents-literally "/proc/meminfo")
+                               (save-match-data
+                                 (string-match (rx bol
+                                                   "MemFree:"
+                                                   (* blank)
+                                                   (group (+ digit))
+                                                   (* blank)
+                                                   "kB")
+                                               (buffer-string))
+                                 (substring-no-properties (buffer-string)
+                                                          (match-beginning 1)
+                                                          (match-end 1))))))))))
+    `(("RAM" ,total ,used))))
+
+(defun eshell-info-banner--get-memory-darwin ()
+  "Get memory usage for Darwin systems.
+See `eshell-info-banner--get-memory'."
+  (let* ((total  (eshell-info-banner--get-memory-unix-command-to-mem "sysctl -n hw.memsize"))
+         (vmstat (with-temp-buffer
+                   (call-process "vm_stat" nil t nil)
+                   (buffer-string)))
+         (wired  (save-match-data
+                   (string-match (rx " wired" (* (not digit)) (+ blank) (group (+ digit)) ".")
+                                 vmstat)
+                   (* 1024 4
+                      (string-to-number (substring-no-properties vmstat
+                                                                 (match-beginning 1)
+                                                                 (match-end 1))))))
+         (active (save-match-data
+                   (string-match (rx " active" (* (not digit)) (+ blank) (group (+ digit)) ".")
+                                 vmstat)
+                   (* 1024 4
+                      (string-to-number (substring-no-properties vmstat
+                                                                 (match-beginning 1)
+                                                                 (match-end 1))))))
+         (compressed (save-match-data
+                       (if (string-match (rx " occupied" (* (not digit)) (+ blank) (group (+ digit)) ".")
+                                         vmstat)
+                           (* 1024 4
+                              (string-to-number (substring-no-properties vmstat
+                                                                         (match-beginning 1)
+                                                                         (match-end 1))))
+                         0))))
+    `(("RAM" ,total ,(+ wired active compressed)))))
+
+(defun eshell-info-banner--get-memory-unix ()
+  "Get memory usage for UNIX systems."
+  (cond ((and (equal system-type 'berkeley-unix)
+              (string-match-p "NetBSD" (eshell-info-banner--shell-command-to-string "uname")))
+         (eshell-info-banner--get-memory-netbsd))
+        ((equal system-type 'darwin)
+         (eshell-info-banner--get-memory-darwin))
+        (t
+         (let* ((total (eshell-info-banner--get-memory-unix-command-to-mem "sysctl hw.physmem"))
+                (used  (eshell-info-banner--get-memory-unix-command-to-mem "sysctl hw.usermem")))
+           `(("RAM" ,total ,used))))))
 
 (defun eshell-info-banner--get-memory-windows ()
   "Get memory usage for Window."
@@ -491,16 +583,16 @@ in bytes."
 (defun eshell-info-banner--memory-to-string (type total used text-padding bar-length)
   "Display a memory’s usage with a progress bar.
 
-The `TYPE' of memory will be the text on the far left, while
-`USED' and `TOTAL' will be displayed on the right of the progress
-bar.  From them, a percentage will be computed which will be used
-to display a colored percentage of the progress bar and it will
-be displayed on the far right.
+The TYPE of memory will be the text on the far left, while USED
+and TOTAL will be displayed on the right of the progress bar.
+From them, a percentage will be computed which will be used to
+display a colored percentage of the progress bar and it will be
+displayed on the far right.
 
-`TEXT-PADDING' will determine how many dots are necessary between
-`TYPE' and the colon.
+TEXT-PADDING will determine how many dots are necessary between
+TYPE and the colon.
 
-`BAR-LENGTH' determines the length of the progress bar to be
+BAR-LENGTH determines the length of the progress bar to be
 displayed."
   (concat (s-pad-right text-padding "." type)
           ": "
@@ -516,10 +608,10 @@ bars will have this appearance:
 
 TYPE......: [=========] XXG / XXG  (XX%)
 
-`TEXT-PADDING': the space allocated to the text at the left of the
+TEXT-PADDING: the space allocated to the text at the left of the
 progress bar.
 
-`BAR-LENGTH': the length of the progress bar."
+BAR-LENGTH: the length of the progress bar."
   (mapconcat (lambda (mem)
                (eshell-info-banner--memory-to-string (nth 0 mem) (nth 1 mem)
                                                      (nth 2 mem) text-padding
@@ -531,7 +623,7 @@ progress bar.
                                         ; Display information ;;;;;;;;;;;;;;;;;
 
 (defun eshell-info-banner--get-color-percentage (percentage)
-  "Display a `PERCENTAGE' with its according face."
+  "Display a PERCENTAGE with its according face."
   (let ((percentage (if (stringp percentage)
                         (string-to-number percentage)
                       percentage)))
@@ -543,12 +635,12 @@ progress bar.
      (t 'eshell-info-banner-normal-face))))
 
 (defun eshell-info-banner--progress-bar (length percentage &optional invert)
-  "Display a progress bar `LENGTH' long and `PERCENTAGE' full.
+  "Display a progress bar LENGTH long and PERCENTAGE full.
 The full path will be displayed filled with the character
 specified by `eshell-info-banner-progress-bar-char' up to
-`PERCENTAGE' percents.  The rest will be empty.
+PERCENTAGE percents.  The rest will be empty.
 
-If `INVERT' is t, then consider the percentage to approach
+If INVERT is t, then consider the percentage to approach
 critical levels close to 0 rather than 100."
   (let* ((length-filled     (if (= 0 percentage)
                                 0
@@ -570,9 +662,9 @@ critical levels close to 0 rather than 100."
 (defun eshell-info-banner--display-battery (text-padding bar-length)
   "If the computer has a battery, display its level.
 
-Pad the left text with dots by `TEXT-PADDING' characters.
+Pad the left text with dots by TEXT-PADDING characters.
 
-`BAR-LENGTH' indicates the length in characters of the progress
+BAR-LENGTH indicates the length in characters of the progress
 bar.
 
 The usage of `eshell-info-banner-warning-percentage' and
@@ -580,7 +672,9 @@ The usage of `eshell-info-banner-warning-percentage' and
 thought of as the “percentage of discharge” of the computer.
 Thus, setting the warning at 75% will be translated as showing
 the warning face with a battery level of 25% or less."
-  (let ((battery-level (when (file-readable-p "/sys/") (battery))))
+  (let ((battery-level (unless (and (equal system-type 'gnu/linux)
+                                    (not (file-readable-p "/sys/")))
+                         (battery))))
     (if (or (null battery-level)
             (string= battery-level "Battery status not available")
             (string-match-p (regexp-quote "N/A") battery-level))
@@ -662,7 +756,7 @@ If RELEASE-FILE is nil, use '/etc/os-release'."
                    (insert-file-contents (concat prefix "/bedrock/etc/bedrock-release"))
                    (buffer-string))))
         ;; Proxmox
-        ((eshell-info-banner--executable-find "pveversion" eshell-info-banner-tramp-aware)
+        ((eshell-info-banner--executable-find "pveversion")
          (let ((distro (eshell-info-banner--shell-command-to-string "pveversion")))
            (save-match-data
              (string-match "/\\([^/]+\\)/" distro)
@@ -670,9 +764,9 @@ If RELEASE-FILE is nil, use '/etc/os-release'."
                      (substring-no-properties distro
                                               (match-beginning 1)
                                               (match-end 1))))))
-        ((eshell-info-banner--executable-find "hostnamectl" eshell-info-banner-tramp-aware)
+        ((eshell-info-banner--executable-find "hostnamectl")
          (eshell-info-banner--get-os-information-from-hostnamectl))
-        ((eshell-info-banner--executable-find "lsb_release" eshell-info-banner-tramp-aware)
+        ((eshell-info-banner--executable-find "lsb_release")
          (eshell-info-banner--get-os-information-from-lsb-release))
         ((file-exists-p (concat prefix "/etc/os-release"))
          (eshell-info-banner--get-os-information-from-release-file))