Support open current dir in desktop file manager

README.md

@@ -79,7 +79,10 @@ I chose to fork because:
   - Sort entries by file size (largest to smallest)
   - Shortcut to invoke file name copier (set using environment variable `NNN_COPIER`)
 #### File associations
-  - Environment variable `NNN_OPENER` to let desktop opener handle it all. E.g.:
+  - To open the current directory in a desktop file manager, set `NNN_DE_FILE_MANAGER`. E.g.:
+
+        export NNN_DE_FILE_MANAGER=thunar
+  - Set `NNN_OPENER` to let a desktop opener handle it all. E.g.:
 
         export NNN_OPENER=xdg-open
         export NNN_OPENER=gnome-open
@@ -90,7 +93,7 @@ I chose to fork because:
     - Associate PDF files with [zathura](https://pwmt.org/projects/zathura/)
     - Removed `less` as default file opener (there is no universal standalone opener utility)
     - You can customize further (see [how to change file associations](#change-file-associations))
-  - Environment variable `NNN_FALLBACK_OPENER` is the last line of defense:
+  - `NNN_FALLBACK_OPENER` is the last line of defense:
     - If the executable in static file association is missing
     - If a file type was not handled in static file association
     - This may be the best option to set your desktop opener to
@@ -145,6 +148,7 @@ Start nnn (default: current directory):
 | `Left`, `Backspace`, `h`, `^H` | Go to parent dir |
 | `~` | Jump to HOME dir |
 | `-` | Jump to last visited dir |
+| `o` | Open dir in desktop file manager |
 | `/`, `&` | Filter dir contents |
 | `c` | Show change dir prompt |
 | `d` | Toggle detail view |

config.def.h

@@ -74,6 +74,8 @@ struct key bindings[] = {
 	{ 'd',            SEL_DETAIL,    "",     "" },
 	/* File details */
 	{ 'D',            SEL_STATS,     "",     "" },
+	/* Open dir in desktop file manager */
+	{ 'o',            SEL_DFB,       "",     "" },
 	/* Toggle sort by size */
 	{ 's',            SEL_FSIZE,     "",     "" },
 	/* Sort by total block size including dir contents */

nnn.1

@@ -42,6 +42,8 @@ Back up one directory level
 Change to the HOME directory
 .It Ic -
 Change to the last visited directory
+.It Ic o
+Open directory in desktop file manager
 .It Ic /, &
 Change filter (more information below)
 .It Ic c
@@ -90,17 +92,7 @@ is configured by modifying
 .Pa config.h
 and recompiling the code.
 .Pp
-Environment variable
+See the environment and examples sections below for more options and information.
-.Ar NNN_OPENER
-overrides all hard-coded file associations.
-.Pp
-Hard-coded associations are specified by regexes matching on the currently selected filename. If a match is found the associated program is executed with the filename passed in as the argument. If no match is found the environment variable
-.Ar NNN_FALLBACK_OPENER
-is invoked, if set.
-.Pp
-No particular utility is set as the default opener as no standalone universal opener for all mime types exists.
-.Pp
-See the examples section below for more information.
 .Sh FILTERS
 Filters support regexes to display only the matched
 entries in the current directory view.  This effectively allows
@@ -119,6 +111,9 @@ files.
 The SHELL, EDITOR and PAGER environment variables take precedence
 when dealing with the !, e and p commands respectively.
 .Pp
+\fBNNN_DE_FILE_MANAGER:\fR set to a desktop file manager to open the current
+directory with.
+.Pp
 \fBNNN_OPENER:\fR set to your desktop environment's default
 mime opener to override all custom mime associations.
 .br

nnn.c

@@ -86,6 +86,7 @@ enum action {
 	SEL_TOGGLEDOT,
 	SEL_DETAIL,
 	SEL_STATS,
+	SEL_DFB,
 	SEL_FSIZE,
 	SEL_BSIZE,
 	SEL_MTIME,
@@ -122,6 +123,7 @@ static int idle;
 static char *opener;
 static char *fallback_opener;
 static char *copier;
+static char *desktop_manager;
 static off_t blk_size;
 static size_t fs_free;
 static int open_max;
@@ -916,6 +918,7 @@ show_help(void)
     [Left], [Backspace], h, ^H  Go to parent dir\n\
     ~                           Jump to HOME dir\n\
     -                           Jump to last visited dir\n\
+    o                           Open dir in desktop file manager\n\
     /, &                        Filter dir contents\n\
     c                           Show change dir prompt\n\
     d                           Toggle detail view\n\
@@ -1485,6 +1488,14 @@ nochange:
 
 			goto begin;
 		}
+		case SEL_DFB:
+			if (!desktop_manager)
+				goto nochange;
+
+			exitcurses();
+			spawn(desktop_manager, path, path, 0);
+			initcurses();
+			goto nochange;
 		case SEL_FSIZE:
 			sizeorder = !sizeorder;
 			mtimeorder = 0;
@@ -1623,6 +1634,9 @@ main(int argc, char *argv[])
 	/* Get the fallback desktop mime opener, if set */
 	fallback_opener = getenv("NNN_FALLBACK_OPENER");
 
+	/* Get the desktop file browser, if set */
+	desktop_manager = getenv("NNN_DE_FILE_MANAGER");
+
 	/* Get the default copier, if set */
 	copier = getenv("NNN_COPIER");