nu: add cycling alt+. and history picker alt+,

Alt+. now cycles through all whitespace-split tokens from history
(most recent first, last arg first within each command) using env
var state. Alt+, opens a skim fuzzy picker over full history commands
and inserts the selected entry at the cursor.

dot_config/nushell/config.nu.tmpl

@@ -33,14 +33,18 @@ $env.config = {
 
   keybindings: [
     {
-      name: insert_last_arg
+      name: cycle_history_args
       modifier: alt
       keycode: char_.
       mode: [vi_insert, emacs]
-      event: {
-        send: executehostcommand
-        cmd: "commandline edit --insert (history | last | get command | split words | last)"
-      }
+      event: { send: executehostcommand, cmd: "last-arg-cycle" }
+    }
+    {
+      name: history_cmd_pick
+      modifier: alt
+      keycode: char_u002c
+      mode: [vi_insert, emacs]
+      event: { send: executehostcommand, cmd: "history-cmd-pick" }
     }
   ]
 }

dot_config/nushell/sys.nu

@@ -25,6 +25,54 @@ def rewatch [interval: duration, cmd: closure] {
   }
 }
 
+# Cycle through all history args on repeated Alt+. presses
+def --env last-arg-cycle [] {
+    let skip = ["|" "&&" "||" ";" ">" ">>" "<" "&" "2>"]
+    let all_args = (
+        history
+        | get command
+        | reverse
+        | each { |cmd| $cmd | split row -r '\s+' | where { |w| ($w | str length) > 0 } | reverse | where { |w| not ($skip | any { $w == $in }) } }
+        | flatten
+        | where { |w| ($w | str length) > 0 }
+    )
+    if ($all_args | is-empty) { return }
+
+    let current = (commandline)
+    let last    = ($env.NU_ALT_DOT_LAST? | default "")
+    let base    = ($env.NU_ALT_DOT_BASE? | default "")
+    let idx     = ($env.NU_ALT_DOT_IDX?  | default (-1) | into int)
+
+    if $idx >= 0 and $current == $"($base)($last)" {
+        let next_idx = (($idx + 1) mod ($all_args | length))
+        let next     = ($all_args | get $next_idx)
+        commandline edit --replace $"($base)($next)"
+        $env.NU_ALT_DOT_IDX  = $next_idx
+        $env.NU_ALT_DOT_LAST = $next
+    } else {
+        let first = ($all_args | get 0)
+        commandline edit --insert $first
+        $env.NU_ALT_DOT_BASE = $current
+        $env.NU_ALT_DOT_IDX  = 0
+        $env.NU_ALT_DOT_LAST = $first
+    }
+}
+
+# Fuzzy-pick a full command from history and insert at cursor (Alt+,)
+def --env history-cmd-pick [] {
+    let cmd = try {
+        history
+        | get command
+        | reverse
+        | uniq
+        | sk --prompt "history> " --height "40%" --reverse --no-sort
+        | str trim
+    } catch { "" }
+    if ($cmd | str length) > 0 {
+        commandline edit --insert $cmd
+    }
+}
+
 # Environment variables as a filterable sorted table
 def envs [query?: string] {
   $env | transpose key value

dot_config/private_user-dirs.dirs

@@ -8,9 +8,9 @@
 XDG_DESKTOP_DIR="$HOME/Desktop"
 XDG_DOWNLOAD_DIR="$HOME/Downloads"
 XDG_TEMPLATES_DIR="$HOME/Templates"
-XDG_PUBLICSHARE_DIR="$HOME/Public"
-XDG_DOCUMENTS_DIR="$HOME/Documents"
-XDG_MUSIC_DIR="$HOME/Music"
-XDG_PICTURES_DIR="$HOME/Pictures"
+XDG_PUBLICSHARE_DIR="$HOME/"
+XDG_DOCUMENTS_DIR="$HOME/"
+XDG_MUSIC_DIR="$HOME/"
+XDG_PICTURES_DIR="$HOME/"
 XDG_VIDEOS_DIR="$HOME/Videos"
 XDG_PROJECTS_DIR="$HOME/Projects"