Set scale mode at startup via argument to -s option

README.md

@@ -82,7 +82,7 @@ of small previews is displayed, making it easy to choose an image to open.
     -q           Be quiet, disable warnings
     -r           Search given directories recursively for images
     -S DELAY     Enable slideshow and set slideshow delay to DELAY seconds
-    -s           Fit images to window
+    -s MODE      Set scale mode to MODE ([d]own, [f]it, [w]idth, [h]eight)
     -t           Start in thumbnail mode
     -v           Print version information and exit
     -Z           Same as `-z 100'

options.c

@@ -33,8 +33,8 @@ const options_t *options = (const options_t*) &_options;
 
 void print_usage(void)
 {
-	printf("usage: sxiv [-bcFfhioqrstvZ] [-G GAMMA] [-g GEOMETRY] [-n NUM] "
-	       "[-N NAME] [-S DELAY] [-z ZOOM] FILES...\n");
+	printf("usage: sxiv [-bcFfhioqrtvZ] [-G GAMMA] [-g GEOMETRY] [-n NUM] "
+	       "[-N NAME] [-S DELAY] [-s MODE] [-z ZOOM] FILES...\n");
 }
 
 void print_version(void)
@@ -45,7 +45,8 @@ void print_version(void)
 void parse_options(int argc, char **argv)
 {
 	int n, opt;
-	char *end;
+	char *end, *s;
+	const char *scalemodes = "dfwh";
 
 	_options.from_stdin = false;
 	_options.to_stdout = false;
@@ -67,7 +68,7 @@ void parse_options(int argc, char **argv)
 	_options.thumb_mode = false;
 	_options.clean_cache = false;
 
-	while ((opt = getopt(argc, argv, "bcFfG:g:hin:N:oqrS:stvZz:")) != -1) {
+	while ((opt = getopt(argc, argv, "bcFfG:g:hin:N:oqrS:s:tvZz:")) != -1) {
 		switch (opt) {
 			case '?':
 				print_usage();
@@ -130,7 +131,12 @@ void parse_options(int argc, char **argv)
 				_options.slideshow = n;
 				break;
 			case 's':
-				_options.scalemode = SCALE_FIT;
+				s = strchr(scalemodes, optarg[0]);
+				if (s == NULL || *s == '\0' || strlen(optarg) != 1) {
+					fprintf(stderr, "sxiv: invalid argument for option -s: %s\n", optarg);
+					exit(EXIT_FAILURE);
+				}
+				_options.scalemode = s - scalemodes;
 				break;
 			case 't':
 				_options.thumb_mode = true;

sxiv.1

@@ -3,7 +3,7 @@
 sxiv \- Simple X Image Viewer
 .SH SYNOPSIS
 .B sxiv
-.RB [ \-bcFfhioqrstvZ ]
+.RB [ \-bcFfhioqrtvZ ]
 .RB [ \-G
 .IR GAMMA ]
 .RB [ \-g
@@ -14,6 +14,8 @@ sxiv \- Simple X Image Viewer
 .IR NUM ]
 .RB [ \-S
 .IR DELAY ]
+.RB [ \-s
+.IR MODE ]
 .RB [ \-z
 .IR ZOOM ]
 .IR FILE ...
@@ -50,8 +52,7 @@ Set image gamma to GAMMA (-32..32).
 .TP
 .BI "\-g " GEOMETRY
 Set window position and size. See section GEOMETRY SPECIFICATIONS of X(7) for
-more information on
-.IR GEOMETRY .
+more information on GEOMETRY argument.
 .TP
 .BI "\-N " NAME
 Set the resource name of sxiv's X window to NAME.
@@ -68,7 +69,7 @@ Read names of files to open from standard input.
 .B \-o
 Write list of all marked files to standard output when quitting. In combination
 with
-.I \-i
+.B \-i
 sxiv can be used as a visual filter/pipe.
 .TP
 .B \-q
@@ -80,8 +81,9 @@ Search the given directories recursively for images to view.
 .BI "\-S " DELAY
 Start in slideshow mode. Set the delay between images to DELAY seconds.
 .TP
-.B \-s
-Fit images to window.
+.BI "\-s " MODE
+Set scale mode according to MODE character. Supported modes are: [d]own, 
+[f]it, [w]idth, [h]eight.
 .TP
 .B \-t
 Start in thumbnail mode.