feat: copy the vertical wallpaper to a phone

With PHONE_V set, every change of the vertical wallpaper is copied to
that path, a fixed name inside a folder Syncthing shares with a phone,
where a Termux loop applies it (script in the README). A copy, not a
symlink, because Syncthing does not follow links. It is built in
~/.cache/wallp and moved into place, so Syncthing never sees a partial
file.

PHONE_SIZE (WxH) crops it to the phone screen, centred, with magick, as
swaybg's fill does: Android otherwise scales a landscape image to the
screen height and shows its left edge. A stamp of source and size skips
an image already copied, so a --restore at login does not make the phone
reapply it. Unset PHONE_V does nothing.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 49 insertions, 0 deletions

diff --git a/tests/wallp.bats b/tests/wallp.bats
index 56f3d54..8a092d4 100644
--- a/tests/wallp.bats
+++ b/tests/wallp.bats
@@ -286,3 +286,52 @@ EOF
   run require_bins
   [ "$status" -eq 0 ]
 }
+
+@test "parse_conf reads optional PHONE_V and expands tilde" {
+  conf="$HOME/c.conf"
+  printf '%s\n' 'PHONE_V=~/sync/phone.png' 'PHONE_SIZE=1440x3120' > "$conf"
+  parse_conf "$conf"
+  [ "$CONF_PHONE_V" = "$HOME/sync/phone.png" ]
+  [ "$CONF_PHONE_SIZE" = "1440x3120" ]
+}
+
+@test "sync_phone copies the vertical wallpaper to PHONE_V" {
+  printf 'img' > "$HOME/v.png"
+  mkdir -p "$HOME/.config/wallp"
+  printf '%s\n' "$HOME/v.png" > "$HOME/.config/wallp/wall_v"
+  CONF_PHONE_V="$HOME/sync/phone.png"
+  sync_phone
+  cmp -s "$HOME/v.png" "$HOME/sync/phone.png"
+}
+
+@test "sync_phone skips a source it already copied" {
+  printf 'img' > "$HOME/v.png"
+  mkdir -p "$HOME/.config/wallp"
+  printf '%s\n' "$HOME/v.png" > "$HOME/.config/wallp/wall_v"
+  CONF_PHONE_V="$HOME/sync/phone.png"
+  sync_phone
+  touch -d '2000-01-01' "$HOME/sync/phone.png"
+  sync_phone
+  [ "$(stat -c %Y "$HOME/sync/phone.png")" = "$(date -d 2000-01-01 +%s)" ]
+}
+
+@test "sync_phone crops to PHONE_SIZE, centred" {
+  magick -size 400x100 xc:red -fill blue -draw 'rectangle 180,0 219,99' "$HOME/v.png"
+  mkdir -p "$HOME/.config/wallp"
+  printf '%s\n' "$HOME/v.png" > "$HOME/.config/wallp/wall_v"
+  CONF_PHONE_V="$HOME/sync/phone.png"
+  CONF_PHONE_SIZE="20x50"
+  sync_phone
+  [ "$(magick identify -format '%wx%h' "$HOME/sync/phone.png")" = "20x50" ]
+  [ "$(magick "$HOME/sync/phone.png" -format '%[hex:p{10,25}]' info:)" = "0000FF" ]
+}
+
+@test "sync_phone does nothing when PHONE_V is unset" {
+  printf 'img' > "$HOME/v.png"
+  mkdir -p "$HOME/.config/wallp"
+  printf '%s\n' "$HOME/v.png" > "$HOME/.config/wallp/wall_v"
+  CONF_PHONE_V=""
+  run sync_phone
+  [ "$status" -eq 0 ]
+  [ ! -e "$HOME/sync" ]
+}