Use readline() at chdir prompt

With the features the readline library provides it would be too naive to ignore.
We break out of the curses mode into the prompt and get back in.
This change introduces dependency on libncurses.

Makefile

@@ -4,10 +4,11 @@ PREFIX = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
 CFLAGS += -O3 -march=native -Wall -Wextra -Wno-unused-parameter
+LDLIBS = -lreadline
 ifeq ($(shell uname), Darwin)
-  LDLIBS = -lncurses
+  LDLIBS += -lncurses
 else
-  LDLIBS = -lncursesw
+  LDLIBS += -lncursesw
 endif
 
 DISTFILES = nnn.c config.def.h nnn.1 Makefile README.md LICENSE

Makefile.generic

@@ -4,10 +4,11 @@ PREFIX = /usr/local
 MANPREFIX = $(PREFIX)/share/man
 
 CFLAGS += -O2 -Wall -Wextra -Wno-unused-parameter
+LDLIBS = -lreadline
 ifeq ($(shell uname), Darwin)
-  LDLIBS = -lncurses
+  LDLIBS += -lncurses
 else
-  LDLIBS = -lncursesw
+  LDLIBS += -lncursesw
 endif
 
 DISTFILES = nnn.c config.def.h nnn.1 Makefile README.md LICENSE

README.md

@@ -141,7 +141,7 @@ nnn vs. ranger memory usage while viewing a directory with 10,178 files, sorted
 
 ### Installation
 
-nnn needs libncursesw on Linux (or ncurses on OS X) and standard libc.
+nnn needs libreadline and libncursesw (on Linux or ncurses on OS X) and standard libc.
 
 - If you are using **Homebrew**, run:
 

nnn.c

@@ -1,26 +1,28 @@
 /* See LICENSE file for copyright and license details. */
+#include <readline/readline.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <sys/wait.h>
 #include <sys/statvfs.h>
 #include <sys/resource.h>
 
+#include <ctype.h>
 #include <curses.h>
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <grp.h>
 #include <limits.h>
 #include <locale.h>
+#include <pwd.h>
 #include <regex.h>
 #include <signal.h>
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
 #include <time.h>
-#include <pwd.h>
-#include <grp.h>
+#include <unistd.h>
 
 #define __USE_XOPEN_EXTENDED
 #include <ftw.h>
@@ -118,6 +120,13 @@ typedef struct entry {
 
 typedef unsigned long ulong;
 
+/* Externs */
+#ifdef __APPLE__
+extern int add_history(const char *);
+#else
+extern void add_history(const char *string);
+#endif
+
 /* Global context */
 static struct entry *dents;
 static int ndents, cur;
@@ -375,6 +384,28 @@ xstricmp(const char *s1, const char *s2)
 	return (int) (TOUPPER(*s1) - TOUPPER(*s2));
 }
 
+static char *
+strstrip(char *s)
+{
+	size_t size;
+	char *end;
+
+	size = strlen(s);
+
+	if (!size)
+		return s;
+
+	end = s + size - 1;
+	while (end >= s && isspace(*end))
+		end--;
+	*(end + 1) = '\0';
+
+	while (*s && isspace(*s))
+		s++;
+
+	return s;
+}
+
 static char *
 openwith(char *file)
 {
@@ -1420,14 +1451,39 @@ nochange:
 			cur = ndents - 1;
 			break;
 		case SEL_CD:
+		{
 			/* Read target dir */
-			printprompt("chdir: ");
-			tmp = readln();
+			char cwd[PATH_MAX];
+			tmp = getcwd(cwd, PATH_MAX);
 			if (tmp == NULL) {
-				clearprompt();
+				printwarn();
+				goto nochange;
+			}
+
+			if (chdir(path) == -1) {
+				printwarn();
 				goto nochange;
 			}
 
+			exitcurses();
+			char *tmp = readline("chdir: ");
+			initcurses();
+			tmp = tmp[0] ? tmp : NULL;
+			if (chdir(cwd) == -1)
+				printwarn();
+
+			if (tmp == NULL) {
+				/* Save current */
+				if (ndents > 0)
+					mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
+
+				goto begin;
+			} else
+				add_history(tmp);
+
+			char *input = tmp;
+			tmp = strstrip(tmp);
+
 			if (tmp[0] == '~') {
 				char *home = getenv("HOME");
 				if (home)
@@ -1441,8 +1497,13 @@ nochange:
 				mkpath(path, tmp, newpath, sizeof(newpath));
 
 			if (canopendir(newpath) == 0) {
+				/* Save current */
+				if (ndents > 0)
+					mkpath(path, dents[cur].name, oldpath, sizeof(oldpath));
+
 				printwarn();
-				goto nochange;
+				free(input);
+				goto begin;
 			}
 
 			/* Save last working directory */
@@ -1452,7 +1513,10 @@ nochange:
 			/* Reset filter */
 			xstrlcpy(fltr, ifilter, sizeof(fltr));
 			DPRINTF_S(path);
+			oldpath[0] = '\0';
+			free(input);
 			goto begin;
+		}
 		case SEL_CDHOME:
 			tmp = getenv("HOME");
 			if (tmp == NULL) {