Export current entry name as NN

The current file or dir name is exported in env var NN before running a cmd at
the command prompt or spawning a shell.

Export current file name as NCUR

README.md

@@ -21,6 +21,7 @@
 ## Index
 
 - [Introduction](#introduction)
+- [Wiki, resources](#wiki-resources)
 - [Features](#features)
 - [Quickstart](#quickstart)
 - [Installation](#installation)
@@ -49,9 +50,9 @@ If you prefer a lightweight system or productivity-boosting utilities, `nnn` is
 
 It runs smoothly on the Raspberry Pi, Termux on Android, Linux, macOS, BSD, Cygwin and Linux subsystem for Windows. `nnn` works seamlessly with DEs and GUI utilities.
 
-#### Important links
+## Wiki, resources
 
-1. [Wiki](https://github.com/jarun/nnn/wiki): operational concepts, how tos, use cases, chronology and insights
+1. [Wiki](https://github.com/jarun/nnn/wiki) (concepts, how-tos, use cases, chronology and insights)
 2. [Performance numbers](https://github.com/jarun/nnn/wiki/Performance)
 3. [Plugin repository and docs](https://github.com/jarun/nnn/tree/master/plugins)
 4. [(neo)vim plugin](https://github.com/mcchrish/nnn.vim)

src/nnn.c

@@ -421,12 +421,14 @@ static const char * const env_cfg[] = {
 #define VISUAL 1
 #define EDITOR 2
 #define PAGER 3
+#define NCUR 4
 
 static const char * const envs[] = {
 	"SHELL",
 	"VISUAL",
 	"EDITOR",
 	"PAGER",
+	"NN",
 };
 
 /* Event handling */
@@ -1113,6 +1115,12 @@ static int spawn(char *file, char *arg1, char *arg2, const char *dir, uchar flag
 	return retstatus;
 }
 
+static void prompt_run(char *cmd, const char *cur, const char *path)
+{
+	setenv(envs[NCUR], cur, 1);
+	spawn(shell, "-c", cmd, path, F_CLI | F_CMD);
+}
+
 /* Get program name from env var, else return fallback program */
 static char *xgetenv(const char *name, char *fallback)
 {
@@ -1739,7 +1747,7 @@ static int filterentries(char *path)
 
 				/* If there's a filter, try a command on ^P */
 				if (cfg.filtercmd && *ch == CONTROL('P') && len > 1) {
-					spawn(shell, "-c", pln, path, F_CLI | F_CMD);
+					prompt_run(pln, (ndents ? dents[cur].name : ""), path);
 					continue;
 				}
 
@@ -4407,6 +4415,7 @@ nochange:
 					goto nochange;
 				break;
 			case SEL_SHELL:
+				setenv(envs[NCUR], (ndents ? dents[cur].name : ""), 1);
 				spawn(shell, NULL, NULL, path, F_CLI);
 				break;
 			case SEL_PLUGKEY: // fallthrough
@@ -4490,7 +4499,7 @@ nochange:
 				}
 #endif
 				if (tmp && tmp[0]) // NOLINT
-					spawn(shell, "-c", tmp, path, F_CLI | F_CMD);
+					prompt_run(tmp, (ndents ? dents[cur].name : ""), path);
 			}
 
 			/* Continue in navigate-as-you-type mode, if enabled */