Add an option to filter duplicate partitions

eshell-info-banner.el

@@ -139,6 +139,13 @@
   :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)
 
 (defmacro eshell-info-banner--executable-find (program)
   "Find PROGRAM executable, possibly on a remote machine.
@@ -417,7 +424,7 @@ 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 +442,24 @@ 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' 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))))
+    partitions))
+
 (defun eshell-info-banner--partition-to-string (partition text-padding bar-length)
   "Display a progress bar showing how full a PARTITION is.