more convenient wallpaper select/fetch

2025-12-01 12:16:03 +03:00
parent 4ff652145b
commit abbea47279
7 changed files with 205 additions and 9 deletions
@@ -0,0 +1,157 @@
+#!/usr/bin/env bash
+# /home/krosh/Documents/Github/nixos-config/home-manager/modules/zsh/next_wallpaper.sh
+# Pick next or random wallpaper from ~/Pictures/Wallpapers and update symlink ~/Pictures/wallpaper.png
+# Then call: swww img "$WALLPAPER"
+
+set -euo pipefail
+# Handle -f <file> anywhere in argv: remove it from "$@" so getopts can still parse -r.
+FORCE_FILE=""
+_remaining=()
+while [ $# -gt 0 ]; do
+    case "$1" in
+        -f)
+            if [ -z "${2-}" ]; then
+                echo "Option -f requires an argument" >&2
+                exit 2
+            fi
+            FORCE_FILE="$2"
+            shift 2
+            ;;
+        *)
+            _remaining+=("$1")
+            shift
+            ;;
+    esac
+done
+# restore remaining args for subsequent getopts
+if [ "${#_remaining[@]}" -gt 0 ]; then
+    set -- "${_remaining[@]}"
+else
+    set --
+fi
+
+# If -f was given, validate and immediately update the symlink & wallpaper, then exit.
+if [ -n "$FORCE_FILE" ]; then
+    if [ ! -f "$FORCE_FILE" ]; then
+        echo "Specified wallpaper not found: $FORCE_FILE" >&2
+        exit 1
+    fi
+
+    TARGET="$(readlink -f "$FORCE_FILE")"
+    SYMLINK_PATH="$HOME/Pictures/wallpaper.png"
+
+    TMP_LINK="$(mktemp -u "${SYMLINK_PATH}.tmp.XXXX")"
+    ln -sfn -- "$TARGET" "$TMP_LINK"
+    mv -f "$TMP_LINK" "$SYMLINK_PATH"
+
+    # export and trigger compositor/wallpaper tools
+    WALLPAPER="$TARGET"
+    swww img "$WALLPAPER" --transition-type fade
+    hyprpanel -q ; hyprpanel & disown
+    wal -c
+    wal -n -i "$WALLPAPER"
+
+    exit 0
+fi
+RANDOM_MODE=0
+while getopts "r" opt; do
+    case "$opt" in
+        r) RANDOM_MODE=1 ;;
+        *) echo "Usage: $0 [-r]" >&2; exit 2 ;;
+    esac
+done
+
+WALLPAPERS_DIR="$HOME/Pictures/Wallpapers"
+SYMLINK="$HOME/Pictures/wallpaper.png"
+
+if [ ! -d "$WALLPAPERS_DIR" ]; then
+    echo "Wallpapers directory not found: $WALLPAPERS_DIR" >&2
+    exit 1
+fi
+
+# Resolve current wallpaper (target of symlink). If not a symlink or missing, CUR will be empty.
+CUR="$(readlink -f "$SYMLINK" 2>/dev/null || true)"
+
+# Collect png files; sort by timestamp ascending (oldest first) using ls -tr.
+# If there are spaces in names, ls handles them, but filenames with newlines are unsupported.
+mapfile -t FILES < <(find "$WALLPAPERS_DIR" -maxdepth 1 -type f -iname '*.png' -print0 | xargs -0 ls -1tr 2>/dev/null || true)
+
+if [ "${#FILES[@]}" -eq 0 ]; then
+    echo "No png wallpapers found in $WALLPAPERS_DIR" >&2
+    exit 1
+fi
+
+choose_random() {
+    # pick random file different from CUR if possible
+    candidates=()
+    for f in "${FILES[@]}"; do
+        [ "$(readlink -f "$f")" = "$CUR" ] && continue
+        candidates+=("$f")
+    done
+    if [ "${#candidates[@]}" -eq 0 ]; then
+        # only current exists
+        echo "No other wallpaper to choose (only current exists)." >&2
+        exit 1
+    fi
+    idx=$((RANDOM % ${#candidates[@]}))
+    echo "${candidates[$idx]}"
+}
+
+choose_next() {
+    # find current in sorted list and pick next (wrap). If current not found, choose first.
+    n=${#FILES[@]}
+    if [ "$n" -eq 1 ]; then
+        # only one file
+        if [ "$(readlink -f "${FILES[0]}")" = "$CUR" ]; then
+            echo "No other wallpaper to choose (only current exists)." >&2
+            exit 1
+        else
+            echo "${FILES[0]}"
+            return
+        fi
+    fi
+
+    # find index of current
+    idx=-1
+    for i in "${!FILES[@]}"; do
+        if [ "$(readlink -f "${FILES[i]}")" = "$CUR" ]; then
+            idx="$i"
+            break
+        fi
+    done
+
+    if [ "$idx" -eq -1 ]; then
+        # current not in list: choose first
+        echo "${FILES[0]}"
+        return
+    fi
+
+    # next index with wrap
+    next=$(( (idx + 1) % n ))
+    # if next equals current (possible if only one), error handled above
+    echo "${FILES[$next]}"
+}
+
+if [ "$RANDOM_MODE" -eq 1 ]; then
+    NEW="$(choose_random)"
+else
+    NEW="$(choose_next)"
+fi
+
+# Ensure absolute path
+NEW="$(readlink -f "$NEW")"
+
+# Create symlink (atomic-ish): create temporary symlink and move
+TMP_SYMLINK="$(mktemp -u "${SYMLINK}.tmp.XXXX")"
+ln -sfn -- "$NEW" "$TMP_SYMLINK"
+mv -f "$TMP_SYMLINK" "$SYMLINK"
+
+# Export for hyprctl command (and run it)
+WALLPAPER="$NEW"
+
+swww img "$WALLPAPER" --transition-type fade
+hyprpanel -q ; hyprpanel & disown
+wal -c
+wal -n -i "$WALLPAPER"
+
+exit 0