sdn-open: improve macOS and WSL experiences

Originally I thought that not supporting %cd would be an issue,
making this kind of utility unclean.

It turns out the desire to launch xdg-open quickly is stronger.

CMakeLists.txt

@@ -26,10 +26,17 @@ target_compile_features (${PROJECT_NAME} PUBLIC cxx_std_14)
 target_compile_definitions (${PROJECT_NAME} PUBLIC
 	-DPROJECT_NAME=\"${PROJECT_NAME}\" -DPROJECT_VERSION=\"${PROJECT_VERSION}\")
 
+add_executable (${PROJECT_NAME}-mc-ext ${PROJECT_NAME}-mc-ext.cpp)
+target_compile_features (${PROJECT_NAME}-mc-ext PUBLIC cxx_std_17)
+
 include (GNUInstallDirs)
-install (TARGETS ${PROJECT_NAME} DESTINATION ${CMAKE_INSTALL_BINDIR})
+# sdn-mc-ext should be in libexec, but we prefer it in PATH.
-install (PROGRAMS ${PROJECT_NAME}-install DESTINATION ${CMAKE_INSTALL_BINDIR})
+install (TARGETS sdn sdn-mc-ext
-install (FILES sdn.1 sdn-install.1 DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
+	DESTINATION ${CMAKE_INSTALL_BINDIR})
+install (PROGRAMS sdn-install sdn-open sdn-view
+	DESTINATION ${CMAKE_INSTALL_BINDIR})
+install (FILES sdn.1 sdn-install.1 sdn-open.1 sdn-view.1
+	DESTINATION ${CMAKE_INSTALL_MANDIR}/man1)
 install (FILES LICENSE DESTINATION ${CMAKE_INSTALL_DOCDIR})
 
 set (CPACK_PACKAGE_DESCRIPTION_SUMMARY "Directory navigator")

LICENSE

@@ -1,4 +1,4 @@
-Copyright (c) 2017 - 2024, Přemysl Eric Janouch <p@janouch.name>
+Copyright (c) 2017 - 2025, Přemysl Eric Janouch <p@janouch.name>
 
 Permission to use, copy, modify, and/or distribute this software for any
 purpose with or without fee is hereby granted.

NEWS

@@ -1,3 +1,22 @@
+Unreleased
+
+ * Added selection functionality, and adjusted key bindings:
+    - C-t or Insert toggle whether the current item is selected;
+    - + and - adjust the selection using shell globs;
+    - t and T insert the selection into the external command line
+      in relative or absolute form, respectively;
+    - Enter is like t but enters directories;
+    - C-g or Escape clear the selection, similarly to the editor.
+
+ * Added an sdn-view script that can process Midnight Commander mc.ext.ini files
+   and apply matching filters; this script has been made the default F3 binding,
+   while the original direct pager invocation has been moved to F13 (which also
+   reflects Midnight Commander)
+
+ * Added an sdn-open script which does the same kind of processing as above
+   on top of xdg-open.  This is what is now executed by M-Enter.
+
+
 1.0.0 (2024-12-21)
 
  * Initial release

README.adoc

@@ -5,7 +5,8 @@ sdn
 'sdn' is a simple directory navigator that you can invoke while editing shell
 commands.  It enables you to:
 
- * take a quick peek at directory contents without running `ls`
+ * take a quick peek at directory contents without running `ls`;
+ * select files to insert into the command line;
  * browse the filesystem without all the mess that Midnight Commander does:
    there's no need to create a subshell in a new pty.  The current command line
    can be simply forwarded if it is to be edited.  What's more, it will always
@@ -25,7 +26,7 @@ or as a https://git.janouch.name/p/nixexprs[Nix derivation].
 
 Building
 --------
-Build dependencies: CMake and/or make, a C++14 compiler, pkg-config +
+Build dependencies: CMake and/or make, a C++17 compiler, pkg-config +
 Runtime dependencies: ncursesw, libacl (on Linux)
 
 // Working around libasciidoc's missing support for escaping it like \++
@@ -75,6 +76,7 @@ that of git, only named colours aren't supported:
 
 ....
 cursor 231 202
+select 202 bold
 bar 16 255 ul
 cwd bold
 input
@@ -91,15 +93,19 @@ To obtain more vifm-like controls, you may write the following to your
 
 ....
 normal h parent
-normal l choose
+normal l enter
 ....
 
 Helper programs
 ~~~~~~~~~~~~~~~
-The F3 and F4 keys are normally bound to actions 'view' and 'edit', similarly to
+The F3, F13 and F4 keys are normally bound to actions 'view', 'view-raw',
-Norton Commander and other orthodox file managers.  The helper programs used
+and 'edit', similarly to Norton Commander and other orthodox file managers.
-here may be changed by setting the PAGER and VISUAL (or EDITOR) environment
+The helper programs used here may be changed by setting the PAGER and VISUAL
-variables.
+(or EDITOR) environment variables.
+
+If 'view' finds Midnight Commander, it will make use of its configuration
+to apply any matching filter, such as to produce archive listings,
+or it will run the respective command.
 
 While it is mostly possible to get 'mcview' working using an invocation like
 `PAGER='mcview -u' sdn`, beware that this helper cannot read files from its

sdn-install.1

@@ -1,6 +1,6 @@
 .Dd October 27, 2020
 .Dt SDN-INSTALL 1
-.Os Linux
+.Os
 .Sh NAME
 .Nm sdn-install
 .Nd integrate sdn with the shell

sdn-mc-ext.cpp

@@ -0,0 +1,222 @@
+//
+// sdn-mc-ext: Midnight Commander extension file processor
+//
+// Copyright (c) 2024, Přemysl Eric Janouch <p@janouch.name>
+//
+// Permission to use, copy, modify, and/or distribute this software for any
+// purpose with or without fee is hereby granted.
+//
+// THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+// WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+// SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+// WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+// OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+// CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+//
+
+#include <cstdlib>
+#include <cctype>
+#include <iostream>
+#include <regex>
+#include <string>
+#include <unordered_map>
+#include <vector>
+
+// Trailing return types make C++ syntax suck considerably less
+#define fun static auto
+
+using namespace std;
+
+// It is completely fine if this only modifies ASCII letters.
+fun tolower (const string &s) -> string {
+    string result;
+	for (auto c : s) result += tolower (c);
+    return result;
+}
+
+fun shell_escape (const string &v) -> string {
+    return "'" + regex_replace (v, regex {"'"}, "'\\''") + "'";
+}
+
+string arg_type, arg_path, arg_basename, arg_dirname, arg_verb;
+unordered_map<string, unordered_map<string, string>> sections;
+
+fun expand_command (string command) -> pair<string, string> {
+	regex re_sequence {R"(%(%|[[:alpha:]]*\{([^}]*)\}|[[:alpha:]]+))"};
+	regex re_name {R"([^{}]*)"};
+	regex re_parameter {R"([^,]+")"};
+	string kind, out, pipe; smatch m;
+	while (regex_search (command, m, re_sequence)) {
+		out.append (m.prefix ());
+		auto seq = m.str (1);
+		command = m.suffix ();
+
+		string argument = m.str (2);
+		if (regex_search (seq, m, re_name))
+			seq = m.str ();
+
+		if (seq == "%") {
+			out += "%";
+		} else if (seq == "p") {
+			out += shell_escape (arg_basename);
+		} else if (seq == "f") {
+			out += shell_escape (arg_path);
+		} else if (seq == "d") {
+			out += shell_escape (arg_dirname);
+		} else if (seq == "var") {
+			string value;
+			if (auto colon = argument.find (':'); colon == argument.npos) {
+				if (auto v = getenv (argument.c_str ()))
+					value = v;
+			} else {
+				value = argument.substr (colon + 1);
+				if (auto v = getenv (argument.substr (0, colon).c_str ()))
+					value = v;
+			}
+			out += shell_escape (value);
+		} else if (seq == "cd") {
+			kind = seq;
+			command = regex_replace (command, regex {"^ +"}, "");
+		} else if (seq == "view") {
+			kind = seq;
+			command = regex_replace (command, regex {"^ +"}, "");
+
+			sregex_token_iterator it (argument.begin (), argument.end (),
+				re_parameter, 0), end;
+			for (; it != end; it++) {
+				if (*it == "hex")
+					pipe.append (" | od -t x1");
+
+				// more(1) and less(1) either ignore or display this:
+				//if (*it == "nroff")
+				//	pipe.append (" | col -b");
+			}
+		} else if (seq == "") {
+			cerr << "sdn-mc-ext: prompting not supported" << endl;
+			return {};
+		} else {
+			cerr << "sdn-mc-ext: unsupported: %" << seq << endl;
+			return {};
+		}
+	}
+	return {kind,
+		pipe.empty () ? out.append (command) : "(" + out + ")" + pipe};
+}
+
+fun print_command (string cmd) {
+	auto command = expand_command (cmd);
+	cout << get<0> (command) << endl << get<1> (command) << endl;
+}
+
+fun section_matches (const unordered_map<string, string> &section) -> bool {
+	if (section.count ("Directory"))
+		return false;
+
+	// The configuration went through some funky changes;
+	// unescape \\ but leave other escapes alone.
+	auto filter_re = [](const string &s) {
+		string result;
+		for (size_t i = 0; i < s.length (); ) {
+			auto c = s[i++];
+			if (c == '\\' && i < s.length ())
+				if (c = s[i++]; c != '\\')
+					result += '\\';
+			result += c;
+		}
+		return result;
+	};
+	auto is_true = [&](const string &name) {
+		auto value = section.find (name);
+		return value != section.end () && value->second == "true";
+	};
+	if (auto kv = section.find ("Type"); kv != section.end ()) {
+		auto flags = std::regex::ECMAScript;
+		if (is_true ("TypeIgnoreCase"))
+			flags |= regex_constants::icase;
+		if (!regex_search (arg_type, regex {filter_re (kv->second), flags}))
+			return false;
+	}
+	auto basename = arg_basename;
+	if (auto kv = section.find ("Regex"); kv != section.end ()) {
+		auto flags = std::regex::ECMAScript;
+		if (is_true ("RegexIgnoreCase"))
+			flags |= regex_constants::icase;
+		return regex_search (basename, regex {filter_re (kv->second), flags});
+	}
+	if (auto kv = section.find ("Shell"); kv != section.end ()) {
+		auto value = kv->second;
+		if (is_true ("ShellIgnoreCase")) {
+			value = tolower (value);
+			basename = tolower (arg_basename);
+		}
+		if (value.empty () || value[0] != '.')
+			return value == basename;
+		return basename.length () >= value.length () &&
+			basename.substr (basename.length () - value.length ()) == value;
+	}
+	return !arg_type.empty ();
+}
+
+fun process (const string &section) -> bool {
+	auto full = sections.at (section);
+	if (auto include = full.find ("Include"); include != full.end ()) {
+		full.erase ("Open");
+		full.erase ("View");
+		full.erase ("Edit");
+
+		if (auto included = sections.find ("Include/" + include->second);
+			included != sections.end ()) {
+			for (const auto &kv : included->second)
+				full[kv.first] = kv.second;
+		}
+	}
+	if (getenv ("SDN_MC_EXT_DEBUG")) {
+		cerr << "[" << section << "]" << endl;
+		for (const auto &kv : full)
+			cerr << "  " << kv.first << ": " << kv.second << endl;
+	}
+	if (full.count (arg_verb) && section_matches (full)) {
+		print_command (full[arg_verb]);
+		return true;
+	}
+	return false;
+}
+
+int main (int argc, char *argv[]) {
+	if (argc != 6) {
+		cerr << "Usage: " << argv[0]
+			<< " TYPE PATH BASENAME DIRNAME VERB < mc.ext.ini" << endl;
+		return 2;
+	}
+
+	arg_type = argv[1];
+	arg_path = argv[2], arg_basename = argv[3], arg_dirname = argv[4];
+	arg_verb = argv[5];
+
+	string line, section;
+	vector<string> order;
+	regex re_entry {R"(^([-\w]+) *= *(.*)$)"};
+	smatch m;
+	while (getline (cin, line)) {
+		if (line.empty () || line[0] == '#') {
+			continue;
+		} else if (auto length = line.length();
+			line.find_last_of ('[') == 0 &&
+			line.find_first_of (']') == length - 1) {
+			order.push_back ((section = line.substr (1, length - 2)));
+		} else if (regex_match (line, m, re_entry)) {
+			sections[section][m[1]] = m[2];
+		}
+	}
+	for (const auto &section : order) {
+		if (section == "mc.ext.ini" ||
+			section == "Default" ||
+			section.substr (0, 8) == "Include/")
+			continue;
+		if (process (section))
+			return 0;
+	}
+	print_command (sections["Default"][arg_verb]);
+	return 0;
+}

sdn-open

@@ -0,0 +1,72 @@
+#!/bin/sh -e
+# sdn-open: an opener for sdn that makes use of Midnight Commander configuration
+# to make more kinds of files directly openable
+
+if [ "$#" -ne 1 ]
+then
+	echo "Usage: $0 FILE" >&2
+	exit 2
+fi
+
+# This handles both MC_DATADIR and odd installation locations.
+datadir=
+if command -v mc >/dev/null
+then datadir=$(mc --datadir | sed 's/ (.*)$//')
+fi
+
+config=
+for dir in "$HOME"/.config/mc "$datadir" /etc/mc
+do
+	if [ -n "$dir" -a -f "$dir/mc.ext.ini" ]
+	then
+		config=$dir/mc.ext.ini
+		break
+	fi
+done
+
+# This is often used in %env{} expansion, so let's be on the same page.
+export PAGER=${PAGER:-less}
+
+export MC_EXT_FILENAME=$(realpath "$1")
+export MC_EXT_BASENAME=$(basename "$1")
+export MC_EXT_CURRENTDIR=$(dirname "$MC_EXT_FILENAME")
+output=$(sdn-mc-ext <"$config" "$(file -Lbz "$1")" \
+	"$MC_EXT_FILENAME" "$MC_EXT_BASENAME" "$MC_EXT_CURRENTDIR" Open || :)
+kind=$(echo "$output" | sed -n 1p)
+command=$(echo "$output" | sed -n 2p)
+
+# We're trying to retain any explicit user preferences while navigating through:
+#  - Debian-based systems have /etc/alternatives/open as /usr/bin/open,
+#    pointing to either /usr/bin/xdg-open or /usr/bin/run-mailcap;
+#  - macOS has /usr/bin/open, and typically no xdg-open;
+#  - Windows Subsystem for Linux has explorer.exe in PATH,
+#    where launched applications may have problems with UNC paths,
+#    and possibly also xdg-open that may not be capable of opening much.
+#
+# Both macOS open and Windows explorer.exe are capable of opening files,
+# directories, as well as URLs through native associations.
+if [ -n "$MC_XDG_OPEN" ]
+then :
+elif command -v explorer.exe >/dev/null
+then export MC_XDG_OPEN=explorer.exe
+elif command -v open >/dev/null
+then export MC_XDG_OPEN=open
+elif command -v xdg-open >/dev/null
+then export MC_XDG_OPEN=xdg-open
+fi
+
+case "$kind" in
+cd)
+	# These mostly enter virtual filesystems, which we do not understand.
+	"$MC_XDG_OPEN" "$MC_EXT_FILENAME"
+	;;
+'')
+	if [ -n "$command" ]
+	then eval "$command"
+	else "$MC_XDG_OPEN" "$MC_EXT_FILENAME"
+	fi
+	;;
+*)
+	echo "Unsupported: $kind" >&2
+	exit 1
+esac

sdn-open.1

@@ -0,0 +1,23 @@
+.Dd November 20, 2025
+.Dt SDN-OPEN 1
+.Os
+.Sh NAME
+.Nm sdn-open
+.Nd run Midnight Commander open configuration externally
+.Sh SYNOPSIS
+.Nm sdn-open
+.Ar path
+.Sh DESCRIPTION
+.Nm
+invokes
+.Xr xdg-open 1
+on the passed filename.
+.Pp
+If it succeeds in finding a
+.Xr mc 1
+.Pa mc.ext.ini
+file, it will first process it, and run any matching command instead.
+.Sh REPORTING BUGS
+Use
+.Lk https://git.janouch.name/p/sdn
+to report bugs, request features, or submit pull requests.

sdn-view

@@ -0,0 +1,54 @@
+#!/bin/sh -e
+# sdn-view: a viewer for sdn that makes use of Midnight Commander configuration
+# to make more kinds of files directly viewable
+
+if [ "$#" -ne 1 ]
+then
+	echo "Usage: $0 FILE" >&2
+	exit 2
+fi
+
+# This handles both MC_DATADIR and odd installation locations.
+datadir=
+if command -v mc >/dev/null
+then datadir=$(mc --datadir | sed 's/ (.*)$//')
+fi
+
+config=
+for dir in "$HOME"/.config/mc "$datadir" /etc/mc
+do
+	if [ -n "$dir" -a -f "$dir/mc.ext.ini" ]
+	then
+		config=$dir/mc.ext.ini
+		break
+	fi
+done
+
+# This is often used in %env{} expansion, so let's be on the same page.
+export PAGER=${PAGER:-less}
+
+export MC_EXT_FILENAME=$(realpath "$1")
+export MC_EXT_BASENAME=$(basename "$1")
+export MC_EXT_CURRENTDIR=$(dirname "$MC_EXT_FILENAME")
+output=$(sdn-mc-ext <"$config" "$(file -Lbz "$1")" \
+	"$MC_EXT_FILENAME" "$MC_EXT_BASENAME" "$MC_EXT_CURRENTDIR" View || :)
+kind=$(echo "$output" | sed -n 1p)
+command=$(echo "$output" | sed -n 2p)
+
+case "$kind" in
+view)
+	if [ -n "$command" ]
+	then eval "$command" | "$PAGER"
+	else "$PAGER" -- "$MC_EXT_FILENAME"
+	fi
+	;;
+'')
+	if [ -n "$command" ]
+	then eval "$command"
+	else "$PAGER" -- "$MC_EXT_FILENAME"
+	fi
+	;;
+*)
+	echo "Unsupported: $kind" >&2
+	exit 1
+esac

sdn-view.1

@@ -0,0 +1,24 @@
+.Dd December 30, 2024
+.Dt SDN-VIEW 1
+.Os
+.Sh NAME
+.Nm sdn-view
+.Nd run Midnight Commander view configuration externally
+.Sh SYNOPSIS
+.Nm sdn-view
+.Ar path
+.Sh DESCRIPTION
+.Nm
+invokes
+.Ev PAGER
+or a fallback pager on the passed filename.
+.Pp
+If it succeeds in finding a
+.Xr mc 1
+.Pa mc.ext.ini
+file, it will first process it, and apply any matching filter,
+or run the respective command.
+.Sh REPORTING BUGS
+Use
+.Lk https://git.janouch.name/p/sdn
+to report bugs, request features, or submit pull requests.

sdn.1

@@ -1,7 +1,7 @@
 \" https://mandoc.bsd.lv/man/roff.7.html#Sentence_Spacing
-.Dd October 27, 2020
+.Dd December 30, 2024
 .Dt SDN 1
-.Os Linux
+.Os
 .Sh NAME
 .Nm sdn
 .Nd directory navigator
@@ -68,8 +68,8 @@ and you can use the
 .Xr dircolors 1
 utility to initialize this variable.
 .It Ev PAGER
-The viewer program to be launched by the F3 key binding as well as to show
+The viewer program to be launched by the F3 and F13 key bindings as well as
-the internal help message.
+to show the internal help message.
 If none is set, it defaults to
 .Xr less 1 .
 .It Ev VISUAL , Ev EDITOR
@@ -95,7 +95,7 @@ names are used for special keys.
 To obtain more vifm-like controls and Windows-like quit abilities:
 .Bd -literal -offset indent
 normal h parent
-normal l choose
+normal l enter
 normal M-f4 quit
 .Ed
 .Pp
@@ -107,7 +107,7 @@ For rxvt, that would be:
 define C-ppage ^[[5^
 define C-npage ^[[6^
 normal C-ppage parent
-normal C-npage choose
+normal C-npage enter
 .Ed
 .Pp
 Escape characters must be inserted verbatim, e.g., by pressing C-v ESC in vi,
@@ -120,6 +120,7 @@ For a black-on-white terminal supporting 256 colours, a theme such as the
 following may work:
 .Bd -literal -offset indent
 cursor 231 202
+select 202 bold
 bar 16 255 ul
 cwd bold
 input

sdn.cpp

@@ -1,7 +1,7 @@
 //
 // sdn: simple directory navigator
 //
-// Copyright (c) 2017 - 2024, Přemysl Eric Janouch <p@janouch.name>
+// Copyright (c) 2017 - 2025, Přemysl Eric Janouch <p@janouch.name>
 //
 // Permission to use, copy, modify, and/or distribute this software for any
 // purpose with or without fee is hereby granted.
@@ -28,6 +28,8 @@
 #include <locale>
 #include <map>
 #include <memory>
+#include <set>
+#include <sstream>
 #include <string>
 #include <tuple>
 #include <vector>
@@ -428,7 +430,9 @@ enum { ALT = 1 << 24, SYM = 1 << 25 };  // Outside the range of Unicode
 #define CTRL(char) ((char) == '?' ? 0x7f : (char) & 0x1f)
 
 #define ACTIONS(XX) XX(NONE) XX(HELP) XX(QUIT) XX(QUIT_NO_CHDIR) \
-	XX(CHOOSE) XX(CHOOSE_FULL) XX(VIEW) XX(EDIT) XX(SORT_LEFT) XX(SORT_RIGHT) \
+	XX(ENTER) XX(OPEN) XX(CHOOSE) XX(CHOOSE_FULL) \
+	XX(VIEW_RAW) XX(VIEW) XX(EDIT) XX(SORT_LEFT) XX(SORT_RIGHT) \
+	XX(SELECT) XX(DESELECT) XX(SELECT_TOGGLE) XX(SELECT_ABORT) \
 	XX(UP) XX(DOWN) XX(TOP) XX(BOTTOM) XX(HIGH) XX(MIDDLE) XX(LOW) \
 	XX(PAGE_PREVIOUS) XX(PAGE_NEXT) XX(SCROLL_UP) XX(SCROLL_DOWN) XX(CENTER) \
 	XX(CHDIR) XX(PARENT) XX(GO_START) XX(GO_HOME) \
@@ -448,14 +452,18 @@ static const char *g_action_names[] = {ACTIONS(XX)};
 #undef XX
 
 static map<wint_t, action> g_normal_actions {
-	{ALT | '\r', ACTION_CHOOSE_FULL}, {ALT | KEY (ENTER), ACTION_CHOOSE_FULL},
+	{'\r', ACTION_ENTER}, {KEY (ENTER), ACTION_ENTER},
-	{'\r', ACTION_CHOOSE}, {KEY (ENTER), ACTION_CHOOSE},
+	{ALT | '\r', ACTION_OPEN}, {ALT | KEY (ENTER), ACTION_OPEN},
+	{'t', ACTION_CHOOSE}, {'T', ACTION_CHOOSE_FULL},
 	{KEY (F (1)), ACTION_HELP}, {'h', ACTION_HELP},
-	{KEY (F (3)), ACTION_VIEW}, {KEY (F (4)), ACTION_EDIT},
+	{KEY (F (3)), ACTION_VIEW}, {KEY (F (13)), ACTION_VIEW_RAW},
+	{KEY (F (4)), ACTION_EDIT},
 	{'q', ACTION_QUIT}, {ALT | 'q', ACTION_QUIT_NO_CHDIR},
 	// M-o ought to be the same shortcut the navigator is launched with
-	{ALT | 'o', ACTION_QUIT},
+	{ALT | 'o', ACTION_QUIT}, {'<', ACTION_SORT_LEFT}, {'>', ACTION_SORT_RIGHT},
-	{'<', ACTION_SORT_LEFT}, {'>', ACTION_SORT_RIGHT},
+	{'+', ACTION_SELECT}, {'-', ACTION_DESELECT},
+	{CTRL ('T'), ACTION_SELECT_TOGGLE}, {KEY (IC), ACTION_SELECT_TOGGLE},
+	{27, ACTION_SELECT_ABORT}, {CTRL ('G'), ACTION_SELECT_ABORT},
 	{'k', ACTION_UP}, {CTRL ('P'), ACTION_UP}, {KEY (UP), ACTION_UP},
 	{'j', ACTION_DOWN}, {CTRL ('N'), ACTION_DOWN}, {KEY (DOWN), ACTION_DOWN},
 	{'g', ACTION_TOP}, {ALT | '<', ACTION_TOP}, {KEY (HOME), ACTION_TOP},
@@ -469,7 +477,7 @@ static map<wint_t, action> g_normal_actions {
 	{'/', ACTION_SEARCH}, {'s', ACTION_SEARCH}, {CTRL ('S'), ACTION_SEARCH},
 	{ALT | 'e', ACTION_RENAME_PREFILL}, {'e', ACTION_RENAME},
 	{KEY (F (6)), ACTION_RENAME_PREFILL}, {KEY (F (7)), ACTION_MKDIR},
-	{'t', ACTION_TOGGLE_FULL}, {ALT | 't', ACTION_TOGGLE_FULL},
+	{ALT | 't', ACTION_TOGGLE_FULL},
 	{'R', ACTION_REVERSE_SORT}, {ALT | '.', ACTION_SHOW_HIDDEN},
 	{CTRL ('L'), ACTION_REDRAW}, {'r', ACTION_RELOAD},
 };
@@ -491,6 +499,7 @@ static map<wint_t, action> g_input_actions {
 static map<wint_t, action> g_search_actions {
 	{CTRL ('P'), ACTION_UP}, {KEY (UP), ACTION_UP},
 	{CTRL ('N'), ACTION_DOWN}, {KEY (DOWN), ACTION_DOWN},
+	{'/', ACTION_ENTER},
 };
 static const map<string, map<wint_t, action>*> g_binding_contexts {
 	{"normal", &g_normal_actions}, {"input", &g_input_actions},
@@ -531,6 +540,7 @@ struct entry {
 struct level {
 	int offset, cursor;                 ///< Scroll offset and cursor position
 	string path, filename;              ///< Level path and filename at cursor
+	set<string> selection;              ///< Filenames of selected entries
 };
 
 static struct {
@@ -538,6 +548,7 @@ static struct {
 	string cwd;                         ///< Current working directory
 	string start_dir;                   ///< Starting directory
 	vector<entry> entries;              ///< Current directory entries
+	set<string> selection;              ///< Filenames of selected entries
 	vector<level> levels;               ///< Upper directory levels
 	int offset, cursor;                 ///< Scroll offset and cursor position
 	bool full_view;                     ///< Show extended information
@@ -552,7 +563,7 @@ static struct {
 	wstring message;                    ///< Message for the user
 	int message_ttl;                    ///< Time to live for the message
 
-	string chosen;                      ///< Chosen item for the command line
+	vector<string> chosen;              ///< Chosen items for the command line
 	string ext_helper;                  ///< External helper to run
 	bool no_chdir;                      ///< Do not tell the shell to chdir
 	bool quitting;                      ///< Whether we should quit already
@@ -568,10 +579,11 @@ static struct {
 	void (*editor_on_change) ();        ///< Callback on editor change
 	map<action, void (*) ()> editor_on; ///< Handlers for custom actions
 
-	enum { AT_CURSOR, AT_BAR, AT_CWD, AT_INPUT, AT_INFO, AT_CMDLINE, AT_COUNT };
+	enum { AT_CURSOR, AT_SELECT, AT_BAR, AT_CWD, AT_INPUT, AT_INFO, AT_CMDLINE,
-	chtype attrs[AT_COUNT] = {A_REVERSE, 0, A_BOLD, 0, A_ITALIC, 0};
+		AT_COUNT };
+	chtype attrs[AT_COUNT] = {A_REVERSE, A_BOLD, 0, A_BOLD, 0, A_ITALIC, 0};
 	const char *attr_names[AT_COUNT] =
-		{"cursor", "bar", "cwd", "input", "info", "cmdline"};
+		{"cursor", "select", "bar", "cwd", "input", "info", "cmdline"};
 
 	map<int, chtype> ls_colors;         ///< LS_COLORS decoded
 	map<string, chtype> ls_exts;        ///< LS_COLORS file extensions
@@ -767,18 +779,25 @@ fun update () {
 	int used = min (available, all - g.offset);
 	for (int i = 0; i < used; i++) {
 		auto index = g.offset + i;
-		bool selected = index == g.cursor;
+		bool cursored = index == g.cursor;
-		attrset (selected ? g.attrs[g.AT_CURSOR] : 0);
+		bool selected = g.selection.count (g.entries[index].filename);
+		chtype attrs {};
+		if (selected)
+			attrs = g.attrs[g.AT_SELECT];
+		if (cursored)
+			attrs = g.attrs[g.AT_CURSOR] | (attrs & ~A_COLOR);
+		attrset (attrs);
+
 		move (g.gravity ? (available - used + i) : i, 0);
 
 		auto used = 0;
 		for (int col = start_column; col < entry::COLUMNS; col++) {
 			const auto &field = g.entries[index].cols[col];
 			auto aligned = align (field, alignment[col] * g.max_widths[col]);
+			if (cursored || selected)
+				for_each (begin (aligned), end (aligned), decolor);
 			if (g.sort_flash_ttl && col == g.sort_column)
 				for_each (begin (aligned), end (aligned), invert);
-			if (selected)
-				for_each (begin (aligned), end (aligned), decolor);
 			used += print (aligned + apply_attrs (L" ", 0), COLS - used);
 		}
 		hline (' ', COLS - used);
@@ -826,6 +845,17 @@ fun update () {
 	} else if (!g.message.empty ()) {
 		move (LINES - 1, 0);
 		print (apply_attrs (g.message, 0), COLS);
+	} else if (!g.selection.empty ()) {
+		uint64_t size = 0;
+		for (const auto &e : g.entries)
+			if (g.selection.count (e.filename)
+			 && S_ISREG (e.info.st_mode) && e.info.st_size > 0)
+				size += e.info.st_size;
+
+		wostringstream status;
+		status << size << L" bytes in " << g.selection.size () << L" items";
+		move (LINES - 1, 0);
+		print (apply_attrs (status.str (), g.attrs[g.AT_SELECT]), COLS);
 	} else if (!g.cmdline.empty ()) {
 		move (LINES - 1, 0);
 		print (g.cmdline, COLS);
@@ -893,6 +923,15 @@ fun show_message (const string &message, int ttl = 30) {
 	g.message_ttl = ttl;
 }
 
+fun filter_selection (const set<string> &selection) {
+	set<string> reselection;
+	if (!selection.empty ())
+		for (const auto &e : g.entries)
+			if (selection.count (e.filename))
+				reselection.insert (e.filename);
+	return reselection;
+}
+
 fun reload (bool keep_anchor) {
 	g.unames.clear ();
 	while (auto *ent = getpwent ())
@@ -931,6 +970,8 @@ fun reload (bool keep_anchor) {
 	}
 	closedir (dir);
 
+	g.selection = filter_selection (g.selection);
+
 readfail:
 	g.out_of_date = false;
 	for (int col = 0; col < entry::COLUMNS; col++) {
@@ -966,7 +1007,7 @@ readfail:
 }
 
 fun run_program (initializer_list<const char *> list, const string &filename) {
-	auto args = (!filename.empty() && filename.front() == '-' ? " -- " : " ")
+	auto args = (!filename.empty () && filename.front () == '-' ? " -- " : " ")
 		+ shell_escape (filename);
 	if (g.ext_helpers) {
 		// XXX: this doesn't try them all out,
@@ -1015,12 +1056,22 @@ fun run_program (initializer_list<const char *> list, const string &filename) {
 	update ();
 }
 
-fun view (const string &filename) {
+fun sdn_open (const string &filename) {
+	run_program ({(const char *) getenv ("SDN_OPENER"), "sdn-open", "xdg-open"},
+		filename);
+}
+
+fun view_raw (const string &filename) {
 	// XXX: we cannot realistically detect that the pager hasn't made a pause
 	// at the end of the file, so we can't ensure all contents have been seen
 	run_program ({(const char *) getenv ("PAGER"), "less", "cat"}, filename);
 }
 
+fun sdn_view (const string &filename) {
+	run_program ({(const char *) getenv ("SDN_VIEWER"), "sdn-view",
+		(const char *) getenv ("PAGER"), "less", "cat"}, filename);
+}
+
 fun edit (const string &filename) {
 	run_program ({(const char *) getenv ("VISUAL"),
 		(const char *) getenv ("EDITOR"), "vi"}, filename);
@@ -1092,6 +1143,17 @@ fun show_help () {
 	fclose (contents);
 }
 
+fun matches_to_editor_info (int matches) {
+	if (g.editor_line.empty ())
+		g.editor_info.clear ();
+	else if (matches == 0)
+		g.editor_info = L"(no match)";
+	else if (matches == 1)
+		g.editor_info = L"(1 match)";
+	else
+		g.editor_info = L"(" + to_wstring (matches) + L" matches)";
+}
+
 fun match (const wstring &needle, int push) -> int {
 	string pattern = to_mb (needle) + "*";
 	bool jump_to_first = push || fnmatch (pattern.c_str (),
@@ -1108,15 +1170,23 @@ fun match (const wstring &needle, int push) -> int {
 }
 
 fun match_interactive (int push) {
-	int matches = match (g.editor_line, push);
+	matches_to_editor_info (match (g.editor_line, push));
-	if (g.editor_line.empty ())
+}
-		g.editor_info.clear ();
+
-	else if (matches == 0)
+fun select_matches (bool dotdot) -> set<string> {
-		g.editor_info = L"(no match)";
+	set<string> matches;
-	else if (matches == 1)
+	for (const auto &e : g.entries) {
-		g.editor_info = L"(1 match)";
+		if (!dotdot && e.filename == "..")
-	else
+			continue;
-		g.editor_info = L"(" + to_wstring (matches) + L" matches)";
+		if (!fnmatch (to_mb (g.editor_line).c_str (),
+			e.filename.c_str (), FNM_PATHNAME))
+			matches.insert (e.filename);
+	}
+	return matches;
+}
+
+fun select_interactive (bool dotdot) {
+	matches_to_editor_info (select_matches (dotdot).size ());
 }
 
 /// Stays on the current item unless there are better matches
@@ -1177,6 +1247,7 @@ fun pop_levels (const string &old_cwd) {
 			g.offset = i->offset;
 			g.cursor = i->cursor;
 			anchor = i->filename;
+			g.selection = filter_selection (i->selection);
 		}
 		i++;
 		g.levels.pop_back ();
@@ -1261,9 +1332,12 @@ fun change_dir (const string &path) {
 		return;
 	}
 
-	level last {g.offset, g.cursor, g.cwd, at_cursor ().filename};
+	level last {g.offset, g.cursor, g.cwd, at_cursor ().filename, g.selection};
 	g.cwd = full_path;
 	bool same_path = last.path == g.cwd;
+	if (!same_path)
+		g.selection.clear ();
+
 	reload (same_path);
 
 	if (!same_path) {
@@ -1301,12 +1375,23 @@ fun initial_cwd () -> string {
 	return ok ? pwd : cwd;
 }
 
-fun choose (const entry &entry) {
+fun choose (const entry &entry, bool full) {
+	if (g.selection.empty ())
+		g.selection.insert (entry.filename);
+	for (const string &item : g.selection)
+		g.chosen.push_back (full ? absolutize (g.cwd, item) : item);
+
+	g.selection.clear ();
+	g.no_chdir = full;
+	g.quitting = true;
+}
+
+fun enter (const entry &entry) {
 	// Dive into directories and accessible symlinks to them
 	if (!S_ISDIR (entry.info.st_mode)
 	 && !S_ISDIR (entry.target_info.st_mode)) {
-		g.chosen = entry.filename;
+		// This could rather launch ${SDN_OPEN:-xdg-open} or something
-		g.quitting = true;
+		choose (entry, false);
 	} else {
 		change_dir (entry.filename);
 	}
@@ -1437,17 +1522,23 @@ fun handle (wint_t c) -> bool {
 	auto i = g_normal_actions.find (c);
 	switch (i == g_normal_actions.end () ? ACTION_NONE : i->second) {
 	case ACTION_CHOOSE_FULL:
-		// FIXME: in the root directory, this inserts //item
+		choose (current, true);
-		g.chosen = g.cwd + "/" + current.filename;
-		g.no_chdir = true;
-		g.quitting = true;
 		break;
 	case ACTION_CHOOSE:
-		choose (current);
+		choose (current, false);
+		break;
+	case ACTION_ENTER:
+		enter (current);
+		break;
+	case ACTION_OPEN:
+		sdn_open (current.filename);
+		break;
+	case ACTION_VIEW_RAW:
+		// Mimic mc, it does not seem sensible to page directories
+		(is_directory ? change_dir : view_raw) (current.filename);
 		break;
 	case ACTION_VIEW:
-		// Mimic mc, it does not seem sensible to page directories
+		(is_directory ? change_dir : sdn_view) (current.filename);
-		(is_directory ? change_dir : view) (current.filename);
 		break;
 	case ACTION_EDIT:
 		edit (current.filename);
@@ -1473,6 +1564,33 @@ fun handle (wint_t c) -> bool {
 		resort ();
 		break;
 
+	case ACTION_SELECT:
+		g.editor = L"select";
+		g.editor_on_change                = [] { select_interactive (false); };
+		g.editor_on[ACTION_INPUT_CONFIRM] = [] {
+			auto matches = select_matches (false);
+			g.selection.insert (begin (matches), end (matches));
+		};
+		break;
+	case ACTION_DESELECT:
+		g.editor = L"deselect";
+		g.editor_on_change                = [] { select_interactive (true); };
+		g.editor_on[ACTION_INPUT_CONFIRM] = [] {
+			for (const auto &match : select_matches (true))
+				g.selection.erase (match);
+		};
+		break;
+	case ACTION_SELECT_TOGGLE:
+		if (g.selection.count (current.filename))
+			g.selection.erase (current.filename);
+		else
+			g.selection.insert (current.filename);
+		g.cursor++;
+		break;
+	case ACTION_SELECT_ABORT:
+		g.selection.clear ();
+		break;
+
 	case ACTION_UP:
 		g.cursor--;
 		break;
@@ -1534,7 +1652,12 @@ fun handle (wint_t c) -> bool {
 		g.editor_on_change                = [] { match_interactive (0); };
 		g.editor_on[ACTION_UP]            = [] { match_interactive (-1); };
 		g.editor_on[ACTION_DOWN]          = [] { match_interactive (+1); };
-		g.editor_on[ACTION_INPUT_CONFIRM] = [] { choose (at_cursor ()); };
+		g.editor_on[ACTION_INPUT_CONFIRM] = [] { enter (at_cursor ()); };
+		g.editor_on[ACTION_ENTER]         = [] {
+			enter (at_cursor ());
+			g.editor_line.clear ();
+			g.editor_cursor = 0;
+		};
 		break;
 	case ACTION_RENAME_PREFILL:
 		g.editor_line = to_wide (current.filename);
@@ -1848,10 +1971,11 @@ fun load_bindings () {
 }
 
 fun load_history_level (const vector<string> &v) {
-	if (v.size () != 7)
+	if (v.size () < 7)
 		return;
 	// Not checking the hostname and parent PID right now since we can't merge
-	g.levels.push_back ({stoi (v.at (4)), stoi (v.at (5)), v.at (3), v.at (6)});
+	g.levels.push_back ({stoi (v.at (4)), stoi (v.at (5)), v.at (3), v.at (6),
+		set<string> (begin (v) + 7, end (v))});
 }
 
 fun load_config () {
@@ -1899,12 +2023,16 @@ fun save_config () {
 		*hostname = 0;
 
 	auto ppid = std::to_string (getppid ());
-	for (auto i = g.levels.begin (); i != g.levels.end (); i++)
+	for (auto i = g.levels.begin (); i != g.levels.end (); i++) {
-		write_line (*config, {"history", hostname, ppid, i->path,
+		vector<string> line {"history", hostname, ppid, i->path,
-			to_string (i->offset), to_string (i->cursor), i->filename});
+			to_string (i->offset), to_string (i->cursor), i->filename};
-	write_line (*config, {"history", hostname, ppid, g.cwd,
+		line.insert (end (line), begin (i->selection), end (i->selection));
-		to_string (g.offset), to_string (g.cursor),
+		write_line (*config, line);
-		at_cursor ().filename});
+	}
+	vector<string> line {"history", hostname, ppid, g.cwd,
+		to_string (g.offset), to_string (g.cursor), at_cursor ().filename};
+	line.insert (end (line), begin (g.selection), end (g.selection));
+	write_line (*config, line);
 }
 
 int main (int argc, char *argv[]) {
@@ -1987,8 +2115,12 @@ int main (int argc, char *argv[]) {
 	save_config ();
 
 	// Presumably it is going to end up as an argument, so quote it
-	if (!g.chosen.empty ())
+	string chosen;
-		g.chosen = shell_escape (g.chosen);
+	for (const auto &item : g.chosen) {
+		if (!chosen.empty ())
+			chosen += ' ';
+		chosen += shell_escape (item);
+	}
 
 	// We can't portably create a standard stream from an FD, so modify the FD
 	dup2 (output_fd, STDOUT_FILENO);
@@ -1999,7 +2131,7 @@ int main (int argc, char *argv[]) {
 	else
 		cout << "local cd=" << endl;
 
-	cout << "local insert=" << shell_escape (g.chosen) << endl;
+	cout << "local insert=" << shell_escape (chosen) << endl;
 	cout << "local helper=" << shell_escape (g.ext_helper) << endl;
 	return 0;
 }