Resurrect default sort

README.md

@@ -79,6 +79,7 @@ Demo videos: i. [`nnn` on Termux (Android)](https://www.youtube.com/watch?v=Abaa
   - Bookmarks; pin and visit a directory
   - Familiar, easy shortcuts (arrows, <kbd>~</kbd>, <kbd>-</kbd>, <kbd>@</kbd>)
 - Sorting
+  - Ordered pure numeric names by default (visit _/proc_)
   - Case-insensitive version (_aka_ natural) sort
   - Sort by file name, modification time, size
 - Search
@@ -198,8 +199,8 @@ Option completion scripts for Bash, Fish and Zsh can be found in respective subd
 #### Cmdline options
 
 ```
-usage: nnn [-b key] [-d] [-e] [-i] [-l] [-p file]
-           [-s] [-S] [-v] [-w] [-h] [PATH]
+usage: nnn [-b key] [-d] [-e] [-i] [-l] [-n]
+           [-p file] [-s] [-S] [-v] [-w] [-h] [PATH]
 
 The missing terminal file manager for X.
 
@@ -212,6 +213,7 @@ optional args:
  -e      use exiftool for media info
  -i      nav-as-you-type mode
  -l      light mode
+ -n      version sort
  -p file selection file (stdout if '-')
  -s      string filters [default: regex]
  -S      du mode

misc/auto-completion/bash/nnn-completion.bash

@@ -17,6 +17,7 @@ _nnn () {
         -h
         -i
         -l
+        -n
         -p
         -s
         -S

misc/auto-completion/fish/nnn.fish

@@ -11,6 +11,7 @@ complete -c nnn -s e    -d 'use exiftool instead of mediainfo'
 complete -c nnn -s h    -d 'show this help and exit'
 complete -c nnn -s i    -d 'start in navigate-as-you-type mode'
 complete -c nnn -s l    -d 'start in light mode (fewer details)'
+complete -c nnn -s n    -d 'use version compare to sort files'
 complete -c nnn -s p -r -d 'copy selection to file'
 complete -c nnn -s s    -d 'use substring match for filters'
 complete -c nnn -s S    -d 'start in disk usage analyzer mode'

misc/auto-completion/zsh/_nnn

@@ -15,6 +15,7 @@ args=(
     '(-h)-h[show this help and exit]'
     '(-i)-i[start in navigate-as-you-type mode]'
     '(-l)-l[start in light mode (fewer details)]'
+    '(-n)-n[use version compare to sort files]'
     '(-p)-p[copy selection to file]:file name'
     '(-s)-s[use substring match for filters]'
     '(-S)-S[start in disk usage analyzer mode]'

nnn.1

@@ -11,6 +11,7 @@
 .Op Ar -e
 .Op Ar -i
 .Op Ar -l
+.Op Ar -n
 .Op Ar -p file
 .Op Ar -s
 .Op Ar -S
@@ -51,6 +52,9 @@ supports the following options:
 .Fl l
         start in light mode (fewer details)
 .Pp
+.Fl n
+        use case-insensitive version compare to sort files
+.Pp
 .Fl "p file"
         copy (or \fIpick\fR) selection to file, or stdout if file='-'
 .Pp

src/nnn.c

@@ -1274,7 +1274,6 @@ static bool write_lastdir(const char *curpath)
 	return ret;
 }
 
-#if 0
 static int digit_compare(const char *a, const char *b)
 {
 	while (*a && *b && *a == *b)
@@ -1362,7 +1361,6 @@ static int xstricmp(const char * const s1, const char * const s2)
 
 	return strcoll(s1, s2);
 }
-#endif
 
 /*
  * Version comparison
@@ -1445,6 +1443,8 @@ static int xstrverscasecmp(const char * const s1, const char * const s2)
 	}
 }
 
+static int (*cmpfn)(const char * const s1, const char * const s2) = &xstricmp;
+
 /* Return the integer value of a char representing HEX */
 static char xchartohex(char c)
 {
@@ -1509,7 +1509,7 @@ static int entrycmp(const void *va, const void *vb)
 			return -1;
 	}
 
-	return xstrverscasecmp(pa->name, pb->name);
+	return cmpfn(pa->name, pb->name);
 }
 
 /*
@@ -4401,8 +4401,8 @@ nochange:
 static void usage(void)
 {
 	fprintf(stdout,
-		"%s: nnn [-b key] [-d] [-e] [-i] [-l] [-p file]\n"
-		"           [-s] [-S] [-v] [-w] [-h] [PATH]\n\n"
+		"%s: nnn [-b key] [-d] [-e] [-i] [-l] [-n]\n"
+		"           [-p file] [-s] [-S] [-v] [-w] [-h] [PATH]\n\n"
 		"The missing terminal file manager for X.\n\n"
 		"positional args:\n"
 		"  PATH   start dir [default: current dir]\n\n"
@@ -4412,6 +4412,7 @@ static void usage(void)
 		" -e      use exiftool for media info\n"
 		" -i      nav-as-you-type mode\n"
 		" -l      light mode\n"
+		" -n      version sort\n"
 		" -p file selection file (stdout if '-')\n"
 		" -s      string filters [default: regex]\n"
 		" -S      du mode\n"
@@ -4545,7 +4546,7 @@ int main(int argc, char *argv[])
 	char *arg = NULL;
 	int opt;
 
-	while ((opt = getopt(argc, argv, "Slib:dep:svwh")) != -1) {
+	while ((opt = getopt(argc, argv, "Slib:denp:svwh")) != -1) {
 		switch (opt) {
 		case 'S':
 			cfg.blkorder = 1;
@@ -4568,6 +4569,9 @@ int main(int argc, char *argv[])
 		case 'e':
 			cfg.metaviewer = EXIFTOOL;
 			break;
+		case 'n':
+			cmpfn = &xstrverscasecmp;
+			break;
 		case 'p':
 			cfg.picker = 1;
 			if (optarg[0] == '-' && optarg[1] == '\0')