Add thumb-info (#265)

Closes: https://github.com/nsxiv/nsxiv/issues/88
Closes: https://github.com/nsxiv/nsxiv/pull/253

5 files changed, 69 insertions, 19 deletions

diff --git a/commands.c b/commands.c
index 5f523ba..111d1e9 100644
--- a/commands.c
+++ b/commands.c
@@ -84,6 +84,8 @@ bool cg_switch_mode(arg_t _)
 		load_image(fileidx);
 		mode = MODE_IMAGE;
 	}
+	close_info();
+	open_info();
 	return true;
 }
 
@@ -429,7 +431,12 @@ bool ci_slideshow(arg_t _)
 
 bool ct_move_sel(arg_t dir)
 {
-	return tns_move_selection(&tns, dir, prefix);
+	bool dirty = tns_move_selection(&tns, dir, prefix);
+	if (dirty) {
+		close_info();
+		open_info();
+	}
+	return dirty;
 }
 
 bool ct_reload_all(arg_t _)
diff --git a/examples/image-info b/examples/image-info
index f608527..5f06123 100755
--- a/examples/image-info
+++ b/examples/image-info
@@ -4,9 +4,10 @@
 # Called by nsxiv(1) whenever an image gets loaded.
 # The output is displayed in nsxiv's status bar.
 # Arguments:
-#   $1: path to image file
+#   $1: path to image file (as provided by the user)
 #   $2: image width
 #   $3: image height
+#   $4: fully resolved path to the image file
 
 s="  " # field separator
 
diff --git a/examples/thumb-info b/examples/thumb-info
new file mode 100755
index 0000000..b422f9c
--- /dev/null
+++ b/examples/thumb-info
@@ -0,0 +1,20 @@
+#!/bin/sh
+
+# Example for $XDG_CONFIG_HOME/nsxiv/exec/thumb-info
+# Called by nsxiv(1) whenever the selected thumbnail changes.
+# The output is displayed in nsxiv's status bar.
+# Arguments:
+#   $1: path to image file (as provided by the user)
+#   $2: empty
+#   $3: empty
+#   $4: fully resolved path to the image file
+
+s="  " # field separator
+
+exec 2>/dev/null
+
+filename=$(basename -- "$4")
+filesize=$(du -Hh -- "$4" | cut -f 1)
+
+echo "${filesize}${s}${filename}"
+
diff --git a/main.c b/main.c
index 686fc60..29bb1ec 100644
--- a/main.c
+++ b/main.c
@@ -76,7 +76,7 @@ typedef struct {
 } extcmd_t;
 
 static struct {
-	extcmd_t f;
+	extcmd_t f, ft;
 	int fd;
 	unsigned int i, lastsep;
 	pid_t pid;
@@ -283,16 +283,21 @@ void close_info(void)
 void open_info(void)
 {
 	spawn_t pfd;
-	char w[12], h[12];
-	char *argv[5];
+	char w[12] = "", h[12] = "";
+	char *argv[6];
+	char *cmd = mode == MODE_IMAGE ? info.f.cmd : info.ft.cmd;
+	bool ferr = mode == MODE_IMAGE ? info.f.err : info.ft.err;
 
-	if (info.f.err || info.fd >= 0 || win.bar.h == 0)
+	if (ferr || info.fd >= 0 || win.bar.h == 0)
 		return;
 	win.bar.l.buf[0] = '\0';
-	snprintf(w, sizeof(w), "%d", img.w);
-	snprintf(h, sizeof(h), "%d", img.h);
-	construct_argv(argv, ARRLEN(argv), info.f.cmd, files[fileidx].name, w, h, NULL);
-	pfd = spawn(info.f.cmd, argv, X_READ);
+	if (mode == MODE_IMAGE) {
+		snprintf(w, sizeof(w), "%d", img.w);
+		snprintf(h, sizeof(h), "%d", img.h);
+	}
+	construct_argv(argv, ARRLEN(argv), cmd, files[fileidx].name, w, h,
+	               files[fileidx].path, NULL);
+	pfd = spawn(cmd, argv, X_READ);
 	if (pfd.readfd >= 0) {
 		fcntl(pfd.readfd, F_SETFL, O_NONBLOCK);
 		info.fd = pfd.readfd;
@@ -396,7 +401,7 @@ static void bar_put(win_bar_t *bar, const char *fmt, ...)
 static void update_info(void)
 {
 	unsigned int i, fn, fw;
-	const char * mark;
+	const char *mark;
 	win_bar_t *l = &win.bar.l, *r = &win.bar.r;
 
 	/* update bar contents */
@@ -411,7 +416,7 @@ static void update_info(void)
 			bar_put(l, "Loading... %0*d", fw, tns.loadnext + 1);
 		else if (tns.initnext < filecnt)
 			bar_put(l, "Caching... %0*d", fw, tns.initnext + 1);
-		else
+		else if (info.ft.err)
 			strncpy(l->buf, files[fileidx].name, l->size);
 		bar_put(r, "%s%0*d/%d", mark, fw, fileidx + 1, filecnt);
 	} else {
@@ -916,8 +921,8 @@ int main(int argc, char *argv[])
 		dsuffix = "/.config";
 	}
 	if (homedir != NULL) {
-		extcmd_t *cmd[] = { &info.f, &keyhandler.f, &wintitle.f };
-		const char *name[] = { "image-info", "key-handler", "win-title" };
+		extcmd_t *cmd[] = { &info.f, &info.ft, &keyhandler.f, &wintitle.f };
+		const char *name[] = { "image-info", "thumb-info", "key-handler", "win-title" };
 		const char *s = "/nsxiv/exec/";
 
 		for (i = 0; i < ARRLEN(cmd); i++) {
diff --git a/nsxiv.1 b/nsxiv.1
index 729d0ec..4488146 100644
--- a/nsxiv.1
+++ b/nsxiv.1
@@ -450,19 +450,36 @@ There is also an example script installed together with nsxiv as
 .IR EGPREFIX/win-title .
 .SH STATUS BAR
 The information displayed on the left side of the status bar can be replaced
-with the output of a user-provided script, which is called by nsxiv whenever an
-image gets loaded. The path of this script is
+with the output of user-provided script.
+.P
+The script that is called by nsxiv whenever an image gets loaded is located at
 .I $XDG_CONFIG_HOME/nsxiv/exec/image-info
 and the arguments given to it are:
 .IP $1 4
-path to image file
+path to image file (as provided by the user)
 .IP $2 4
 image width
 .IP $3 4
 image height
+.IP $4 4
+fully resolved path to the image file
 .P
-There is also an example script installed together with nsxiv as
-.IR EGPREFIX/image-info .
+In thumbnail mode, the script that is called is located at
+.I $XDG_CONFIG_HOME/nsxiv/exec/thumb-info
+and the arguments given to it are:
+.IP $1 4
+path to image file (as provided by the user)
+.IP $2 4
+empty
+.IP $3 4
+empty
+.IP $4 4
+fully resolved path to the image file
+.P
+There are also example scripts installed together with nsxiv as
+.IR EGPREFIX/image-info
+and
+.IR EGPREFIX/thumb-info .
 .SH EXTERNAL KEY HANDLER
 Additional external keyboard commands can be defined using a handler program
 located in