From 40e2fffab2c560eff06c96e1e102de9c3df6652f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Marco=20Diego=20Aur=C3=A9lio=20Mesquita?= <address@hidden>
Date: Fri, 16 Feb 2018 20:47:06 -0300
Subject: [PATCH] Pipe slected text to external command.
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

When there is marked text and a command is executed, nano should pipe it
to the external command and replace the text it by the command's output.

Signed-off-by: Marco Diego Aurélio Mesquita <address@hidden>
---
 src/text.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

diff --git a/src/text.c b/src/text.c
index e80c09c9..6a8040e6 100644
--- a/src/text.c
+++ b/src/text.c
@@ -1082,10 +1082,33 @@ RETSIGTYPE cancel_command(int signal)
 		nperror("kill");
 }
 
+/* Sends buffer pointed to by inptr to file descriptor fd. */
+void send_data(int fd, const filestruct *inptr)
+{
+	FILE *fp = fdopen(fd, "w");
+
+	if (fp == NULL)
+		return;
+
+	while (inptr != NULL) {
+		/* If last line is empty, we should not send it. */
+		if(inptr->next == NULL && inptr->data[0] == '\0')
+			break;
+
+		fprintf(fp, "%s\n", inptr->data);
+		inptr = inptr->next;
+	}
+
+	fclose(fp);
+}
+
 /* Execute command in a shell.  Return TRUE on success. */
 bool execute_command(const char *command)
 {
 	int fd[2];
+	int out_fd[2];
+		/* Pipe through which text will be sent for external command. */
+	const bool has_selection = openfile->mark;
 	FILE *f;
 	const char *shellenv;
 	struct sigaction oldaction, newaction;
@@ -1099,6 +1122,11 @@ bool execute_command(const char *command)
 		return FALSE;
 	}
 
+	if (has_selection && pipe(out_fd)) {
+		statusbar(_("Could not create outgoing pipe"));
+		return FALSE;
+	}
+
 	/* Check $SHELL for the shell to use.  If it isn't set, use /bin/sh.
 	 * Note that $SHELL should contain only a path, with no arguments. */
 	shellenv = getenv("SHELL");
@@ -1111,6 +1139,11 @@ bool execute_command(const char *command)
 		dup2(fd[1], fileno(stdout));
 		dup2(fd[1], fileno(stderr));
 
+		if (has_selection) {
+			close(out_fd[1]);
+			dup2(out_fd[0], fileno(stdin));
+		}
+
 		/* If execl() returns at all, there was an error. */
 		execl(shellenv, tail(shellenv), "-c", command, NULL);
 		exit(0);
@@ -1125,6 +1158,18 @@ bool execute_command(const char *command)
 		return FALSE;
 	}
 
+	/* If text was selected, pipe it to external command. */
+	if (has_selection) {
+		filestruct *was_cutbuffer = cutbuffer;
+		close(out_fd[0]);
+		cutbuffer = NULL;
+		do_cut_text_void();
+		send_data(out_fd[1], cutbuffer);
+		close(out_fd[1]);
+		free_filestruct(cutbuffer);
+		cutbuffer = was_cutbuffer;
+	}
+
 	/* Before we start reading the forked command's output, we set
 	 * things up so that Ctrl-C will cancel the new process. */
 
-- 
2.11.0