Add new variables to the README

Check for compatibility with all version of Emacs since Emacs 25.1

Add Cask file for managing dependencies in CI

Add badge in README for CI

README.org

@@ -109,6 +109,15 @@ A couple of variables can be edited by the user in order to configure
   set its value to ~("/dev" "zroot")~.
 
   Default value: ~("/dev")~
+- ~eshell-info-banner-filter-duplicate-partitions~ :: Try to filter
+  out duplicate partitions. Two partitions are considered duplicate if
+  they have the same size and amount of space used.
+
+  Default value: ~nil~
+- ~eshell-info-banner-exclude-partitions~ :: List of pattens to exclude
+  from the partition list.
+
+  Default value: ~nil~
 - ~eshell-info-banner-shorten-path-from~ :: Maximum length of the mount
   path of a partition before it gets abbreviated. Set it to ridiculous
   numbers in order to disable it (something like ~1000~ should be more

eshell-info-banner.el

@@ -139,6 +139,21 @@
   :group 'eshell-info-banner
   :type 'list)
 
+(defcustom eshell-info-banner-filter-duplicate-partitions nil
+  "Whether to filter duplicate partitions.
+
+Two partitions are considered duplicate if they have the same
+size and amount of space used."
+  :group 'eshell-info-banner
+  :type 'boolean)
+
+(defcustom eshell-info-banner-exclude-partitions nil
+  "List of patterns to exclude from the partition list.
+
+Patterns are matched against the partition name with
+`string-match-p'."
+  :group 'eshell-info-banner
+  :type '(repeat string))
 
 (defmacro eshell-info-banner--executable-find (program)
   "Find PROGRAM executable, possibly on a remote machine.
@@ -417,7 +432,7 @@ Return detected partitions as a list of structs.  See
 chosen.  Relies on the `df' command."
   (eshell-info-banner--get-mounted-partitions-df 8))
 
-(defun eshell-info-banner--get-mounted-partitions ()
+(defun eshell-info-banner--get-mounted-partitions-1 ()
   "Detect mounted partitions on the system.
 
 Return detected partitions as a list of structs."
@@ -435,6 +450,34 @@ Return detected partitions as a list of structs."
          (warn "Partition detection for %s not yet supported." other)
          nil)))))
 
+(defun eshell-info-banner--get-mounted-partitions ()
+  "Detect mounted partitions on the system.
+
+Take `eshell-info-banner-filter-duplicate-partitions' and
+`eshell-info-banner-exclude-partitions' into account."
+  (let ((partitions (eshell-info-banner--get-mounted-partitions-1)))
+    (when eshell-info-banner-filter-duplicate-partitions
+      (setq partitions
+            (cl-loop for partition in partitions
+                     with used = nil
+                     for signature =
+                     (format "%d-%d"
+                             (eshell-info-banner--mounted-partitions-size partition)
+                             (eshell-info-banner--mounted-partitions-used partition))
+                     unless (member signature used)
+                     collect partition and do (push signature used))))
+    (when eshell-info-banner-exclude-partitions
+      (setq partitions
+            (seq-filter (lambda (partition)
+                          (let ((path (eshell-info-banner--mounted-partitions-path
+                                       partition)))
+                            (not (seq-some
+                                  (lambda (pattern)
+                                    (string-match-p pattern path))
+                                  eshell-info-banner-exclude-partitions))))
+                        partitions)))
+    partitions))
+
 (defun eshell-info-banner--partition-to-string (partition text-padding bar-length)
   "Display a progress bar showing how full a PARTITION is.