Add chafa support

README.md

@@ -50,7 +50,7 @@ For example, you only need either `elinks`, `lynx` or
 | diff | `colordiff` `delta` `diff-so-fancy` |
 | directory | `ls` |
 | html | `elinks` `lynx` `w3m` |
-| image | `ueberzug` |
+| image | `ueberzug` `chafa` |
 | json | `jq` |
 | markdown | `mdcat` |
 | odt | `libreoffice` |

doc/ctpv.1

@@ -116,7 +116,7 @@ html	T{
 elinks lynx w3m
 T}
 image	T{
-ueberzug
+ueberzug chafa
 T}
 json	T{
 jq

previews.h

@@ -24,7 +24,7 @@ Preview b_previews[] = {
     PR(NULL,      "text",           NULL,             source_highlight),
     PR(NULL,      "text",           NULL,             cat),
 
-    PR(NULL,      "image",          NULL,             ueberzug),
+    PR(NULL,      "image",          NULL,             image),
     PR(NULL,      "video",          NULL,             video),
 
     PR(NULL,      "application",    "pdf",            pdf),

sh/clear.sh

@@ -1,7 +1,10 @@
-setup_fifo 1
+setup_image 1
 
-if use_kitty; then
-	kitty +kitten icat --clear --transfer-mode file
-elif use_ueberzug; then
-	printf '{"action": "remove", "identifier": "preview"}\n' > "$fifo"
-fi
+case "$image_method" in
+	"$image_method_ueberzug")
+		printf '{"action": "remove", "identifier": "preview"}\n' > "$fifo"
+		;;
+	"$image_method_kitty")
+		kitty +kitten icat --clear --transfer-mode file
+		;;
+esac

sh/end.sh

@@ -1,4 +1,4 @@
-setup_fifo 1
+setup_image 1
 
 # tell ctpv server to exit
-use_ueberzug && printf '\0' > "$fifo"
+[ "$image_method" = "$image_method_ueberzug" ] && printf '\0' > "$fifo"

sh/helpers.sh

@@ -1,40 +1,11 @@
+image_method_ueberzug='U'
+image_method_kitty='K'
+image_method_chafa='C'
+
 echo_err() {
 	echo "$@" >&2
 }
 
-is_kitty() {
-	[ -n "$KITTY_PID" ]
-}
-
-use_ueberzug() {
-	[ -n "$WAYLAND_DISPLAY" ] && return 1
-	[ -n "$DISPLAY" ] && exists ueberzug
-}
-
-use_kitty() {
-	[ -z "$forcekitty" ] && use_ueberzug && return 1
-	is_kitty
-}
-
-noimages() {
-	[ -n "$noimages" ]
-}
-
-fifo_open() {
-	# https://unix.stackexchange.com/a/522940/183147
-	dd oflag=nonblock conv=notrunc,nocreat count=0 of="$1" \
-		>/dev/null 2>/dev/null
-}
-
-setup_fifo() {
-	use_ueberzug || return 1
-
-	exit_code="${1:-127}"
-	[ -n "$fifo" ] || exit "$exit_code"
-	[ -e "$fifo" ] || exit "$exit_code"
-	fifo_open "$fifo" || exit "$exit_code"
-}
-
 exists() {
 	command -v "$1" >/dev/null
 }
@@ -43,25 +14,71 @@ check_exists() {
 	exists "$@" || exit 127
 }
 
+noimages() {
+	[ -n "$noimages" ]
+}
+
+is_kitty() {
+	[ -n "$KITTY_PID" ]
+}
+
+fifo_open() {
+	# https://unix.stackexchange.com/a/522940/183147
+	dd oflag=nonblock conv=notrunc,nocreat count=0 of="$1" \
+		>/dev/null 2>/dev/null
+}
+
+set_image_method() {
+	image_method=
+
+	[ -n "$forcekitty" ] && is_kitty && { image_method="$image_method_kitty"; return 0; }
+	[ -n "$forcechafa" ] && exists chafa && { image_method="$image_method_chafa"; return 0; }
+
+	[ -n "$DISPLAY" ] && [ -z "$WAYLAND_DISPLAY" ] && exists ueberzug &&
+		[ -n "$fifo" ] && [ -e "$fifo" ] &&
+		{ image_method="$image_method_ueberzug"; return 0; }
+
+	is_kitty && { image_method="$image_method_kitty"; return 0; }
+
+	exists chafa && { image_method="$image_method_chafa"; return 0; }
+}
+
+setup_fifo() {
+	fifo_open "$fifo" || exit "${1:-127}"
+}
+
+setup_image() {
+	set_image_method
+
+	[ "$image_method" = "$image_method_ueberzug" ] && setup_fifo "$@"
+}
+
 send_image() {
 	noimages && return 127
 
-	if use_kitty; then
-		kitty +kitten icat --transfer-mode file --align left \
-			--place "${w}x${h}@${x}x${y}" "$1"
-		return 1
-	elif use_ueberzug; then
-		path="$(printf '%s' "$1" | sed 's/\\/\\\\/g; s/"/\\"/g')"
-		printf '{ "action": "add", "identifier": "preview", "x": %d, "y": %d, "width": %d, "height": %d, "scaler": "contain", "scaling_position_x": 0.5, "scaling_position_y": 0.5, "path": "%s"}\n' "$x" "$y" "$w" "$h" "$path" > "$fifo"
-		return 1
-	else
-		return 127
-	fi
+	case "$image_method" in
+		"$image_method_ueberzug")
+			path="$(printf '%s' "$1" | sed 's/\\/\\\\/g; s/"/\\"/g')"
+			printf '{ "action": "add", "identifier": "preview", "x": %d, "y": %d, "width": %d, "height": %d, "scaler": "contain", "scaling_position_x": 0.5, "scaling_position_y": 0.5, "path": "%s"}\n' "$x" "$y" "$w" "$h" "$path" > "$fifo"
+			return 1
+			;;
+		"$image_method_kitty")
+			kitty +kitten icat --transfer-mode file --align left \
+				--place "${w}x${h}@${x}x${y}" "$1"
+			return 1
+			;;
+		"$image_method_chafa")
+			chafa --animate off -s "${w}x${h}" "$1"
+			;;
+		*)
+			return 127
+			;;
+	esac
 }
 
 convert_and_show_image() {
-	noimages && exit 127
-	setup_fifo
+	noimages && return 127
+	setup_image
 	[ -n "$cache_valid" ] || "$@" || exit "$?"
 	send_image "$cache_f"
 }

sh/prev/image.sh

@@ -0,0 +1,5 @@
+# image: ueberzug chafa
+
+setup_image
+
+send_image "$f"

sh/prev/ueberzug.sh

@@ -1,5 +0,0 @@
-# image: ueberzug
-
-setup_fifo
-
-send_image "$f"

src/config.c

@@ -42,6 +42,7 @@ static VectorPreview *previews;
 
 static struct Option options[] = {
     { "forcekitty", OPTION_BOOL, { .i = &ctpv.opts.forcekitty } },
+    { "forcechafa", OPTION_BOOL, { .i = &ctpv.opts.forcechafa } },
     { "noimages", OPTION_BOOL, { .i = &ctpv.opts.noimages } },
 };
 

src/ctpv.h

@@ -14,7 +14,7 @@ struct CTPV {
     } mode;
     char *server_id_s;
     struct {
-        int forcekitty, noimages;
+        int forcekitty, forcechafa, noimages;
     } opts;
 };
 

src/shell.c

@@ -35,6 +35,7 @@ int run_script(char *script, size_t script_len, int *exitcode, int *signal,
                SpawnProg sp, void *sp_arg)
 {
     ERRCHK_RET_ERN(setenv("forcekitty", ctpv.opts.forcekitty ? "1" : "", 1) == -1);
+    ERRCHK_RET_ERN(setenv("forcechafa", ctpv.opts.forcechafa ? "1" : "", 1) == -1);
     ERRCHK_RET_ERN(setenv("noimages", ctpv.opts.noimages ? "1" : "", 1) == -1);
 
     char *scr = prepend_helpers(script, script_len);