Fix #1023: support named persistent settions

nnn.1

@@ -170,23 +170,26 @@ A new context copies the state of the previous context. Each context can have
 its own color. See ENVIRONMENT section.
 .Sh SESSIONS
 Sessions are a way to save and restore states of work. A session stores the
-settings and contexts.
+settings and contexts. Sessions can be loaded at runtime or with a program
+option.
 .Pp
-Sessions can be loaded dynamically at runtime or with a program option.
+- When a session is loaded at runtime, the last working state is saved
-.Pp
+automatically to a dedicated "auto session" session file. Session option
-When a session is loaded dynamically, the last working session is saved
+\fIrestore\fR would restore the "auto session".
-automatically to a dedicated -- "last session" -- session file. The "last
+.br
-session" is also used in persistent session mode.
+- The persistent session option is global. If it is used, the last active session
-.Pp
+will be updated with the final state at program quit.
-Listing input stream has a higher priority to session options (-s/-S). Sessions
+.br
-can be loaded explicitly at runtime. Session option \fIrestore\fR would restore
+- The "auto session" is used in persistent session mode if no session is active.
-the persistent session at runtime.
+.br
+- Listing input stream and opening a bookmark by key have a higher priority to
+session options (-s/-S).
 .Pp
 All the session files are located by session name in the directory
 .Pp
 \fB${XDG_CONFIG_HOME:-$HOME/.config}/nnn/sessions\fR
 .Pp
-"@" is the "last session" file.
+"@" is the "auto session" file.
 .Sh FILTERS
 Filters are strings (or regex patterns) to find matching entries in the current
 directory instantly (\fIsearch-as-you-type\fR). Matches are case-insensitive by

src/nnn.c

@@ -335,7 +335,8 @@ typedef struct {
 	uint_t stayonsel  : 1;  /* Disable auto-proceed on select */
 	uint_t dirctx     : 1;  /* Show dirs in context color */
 	uint_t uidgid     : 1;  /* Show owner and group info */
-	uint_t reserved   : 9;  /* Adjust when adding/removing a field */
+	uint_t prstssn    : 1;  /* Persistent session */
+	uint_t reserved   : 8;  /* Adjust when adding/removing a field */
 } runstate;
 
 /* Contexts or workspaces */
@@ -3851,12 +3852,11 @@ static void savecurctx(settings *curcfg, char *path, char *curname, int nextctx)
 }
 
 #ifndef NOSSN
-static void save_session(bool last_session, int *presel)
+static void save_session(const char *sname, int *presel)
 {
 	int i;
 	session_header_t header;
 	FILE *fsession;
-	char *sname;
 	bool status = FALSE;
 	char ssnpath[PATH_MAX];
 	char spath[PATH_MAX];
@@ -3877,10 +3877,6 @@ static void save_session(bool last_session, int *presel)
 		}
 	}
 
-	sname = !last_session ? xreadline(NULL, messages[MSG_SSN_NAME]) : "@";
-	if (!sname[0])
-		return;
-
 	mkpath(cfgpath, toks[TOK_SSN], ssnpath);
 	mkpath(ssnpath, sname, spath);
 
@@ -3942,7 +3938,7 @@ static bool load_session(const char *sname, char **path, char **lastdir, char **
 		mkpath(ssnpath, "@", spath);
 
 	if (has_loaded_dynamically)
-		save_session(TRUE, NULL);
+		save_session("@", NULL);
 
 	fsession = fopen(spath, "rb");
 	if (!fsession) {
@@ -7128,9 +7124,11 @@ nochange:
 		case SEL_SESSIONS:
 			r = get_input(messages[MSG_SSN_OPTS]);
 
-			if (r == 's')
+			if (r == 's') {
-				save_session(FALSE, &presel);
+				tmp = xreadline(NULL, messages[MSG_SSN_NAME]);
-			else if (r == 'l' || r == 'r') {
+				if (tmp && *tmp)
+					save_session(FALSE, &presel);
+			} else if (r == 'l' || r == 'r') {
 				if (load_session(NULL, &path, &lastdir, &lastname, r == 'r')) {
 					setdirwatch();
 					goto begin;
@@ -7186,8 +7184,8 @@ nochange:
 			}
 
 #ifndef NOSSN
-			if (session && *session == '@' && !session[1])
+			if (session && g_state.prstssn)
-				save_session(TRUE, NULL);
+				save_session(session, NULL);
 #endif
 
 			/* CD on Quit */
@@ -7768,7 +7766,9 @@ int main(int argc, char *argv[])
 				session = optarg;
 			break;
 		case 'S':
-			session = "@";
+			g_state.prstssn = 1;
+			if (!session) /* Support named persistent sessions */
+				session = "@";
 			break;
 #endif
 		case 't':