Create a dedicated script for selects

lib/modules/partition/choose-disk.fish

@@ -1,52 +1,34 @@
 #!/bin/env fish
-function chooseDisk -a outFile message
-
-    while true
-        set -l disks
-
-        lsblk -do NAME,SIZE,TYPE | while read disk
-            set -l diskInfo (string split -n " " $disk)
-
-            if contains "$diskInfo[3]" "TYPE" "disk"
-                set -a disks "$diskInfo"
-            end
-        end
-
-        set -l diskCount (count $disks)
-        set -l padding (math (string length "$diskCount") + 1)
-
-        if [ "$diskCount" -gt 0 ]
-            echo "$message"
-            set -l prefix
-
-            for i in (seq "$diskCount")
-                if [ "$i" -eq 1 ]
-                    set prefix ""
-                else
-                    set prefix "$(math "$i" - 1):"
-                end
-
-                printf "%"$padding"s %s\n" "$prefix" "$disks[$i]"
-            end
-
-            read -lP "Your choice: " choice
-            or exit 1
-
-            if math "0+$choice" &> /dev/null
-                if [ "$choice" -ge 1 ] && [ "$choice" -le "$diskCount" ]
-                    set -l disk (string split -n " " "$disks[$(math "$choice" + 1)]")
-                    echo "/dev/$disk[1]" > $outFile
-                    return
-                end
-            end
-
-            echo "The specified choice \"$choice\" is invalid!"
-        else
-            echo "No valid disk found!" >&2
-        end
+function chooseDisk -a outFile message selectScript
+    if [ -z "$selectScript" ]
+        set selectScript "$(status dirname)/select.fish"
     end
 
-    return 1
+    source "$selectScript"
+
+    while true
+        set -l header
+        set -l disks
+
+        lsblk -do NAME,SIZE,TYPE | begin
+            read header
+
+            cat | while read disk
+                set -l diskInfo (string split -n " " $disk)
+
+                if contains "$diskInfo[3]" "disk"
+                    set -a disks "$disk"
+                end
+            end
+        end
+
+        select "$header" "$outFile" "$message" "No valid disk found!" "$(string collect $disks)" "false"
+        and begin
+            set -l disk (string split -n " " (cat "$outFile"))
+            echo "/dev/$disk[1]" > $outFile
+            return
+        end
+    end
 end
 
 chooseDisk $argv

lib/modules/partition/disks.nix

@@ -79,7 +79,7 @@
 
           diskSelector = ''
             result="$(mktemp)"
-            fish ${./choose-disk.fish} "$result" "Which disk do you wish to install the OS on?"
+            fish ${./choose-disk.fish} "$result" "Which disk do you wish to install the OS on?" ${./select.fish}
             ${diskVarName}="$(cat "$result")"
           '';
 

lib/modules/partition/select.fish

@@ -0,0 +1,46 @@
+function select -a header outFile message error choices loop
+    if [ -z "$loop" ]
+        set loop "true"
+    end
+
+    while true
+        set -l items
+        
+        echo "$choices" | while read choice
+            set -a items "$choice"
+        end
+
+        set -l count (count $items)
+        set -l padding (math (string length "$count") + 1)
+
+        if [ "$count" -gt 0 ]
+            echo "$message"
+            printf "%"$padding"s %s\n" "" "$header"
+
+            for i in (seq "$count")
+                printf "%"$padding"s %s\n" "$i" "$items[$i]"
+            end
+
+            read -lP "Your choice: " choice
+            or exit 1
+
+            if math "0+$choice" &> /dev/null
+                if [ "$choice" -ge 1 ] && [ "$choice" -le "$count" ]
+                    echo "$items[$choice]" > $outFile
+                    return
+                end
+            end
+
+            echo "The specified \"$choice\" is invalid!"
+        else
+            echo "$error" >&2
+            exit
+        end
+
+        if not "$loop"
+            break
+        end
+    end
+
+    return 1
+end