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	tAdd support for scroll(1) - st - [fork] customized build of st, the simple ter…
	git clone git://src.adamsgaard.dk/st
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	commit 21e0d6e8b8d20903494386e7e6f43201b3761154
	parent 5703aa0390484dd7da4bd9c388c85708d8fcd339
	Author: Roberto E. Vargas Caballero <[email protected]>
	Date: Fri, 10 Apr 2020 22:06:32 +0200

	Add support for scroll(1)

	Scroll is a program that stores all the lines of its child and be used in st as
	a way of implementing scrollback.

	This solution is much better than implementing the scrollback in st itself
	because having a different program allows to use it in any other program
	without doing modifications to those programs.

	Diffstat:
	M config.def.h \| 3 ++-
	M st.1 \| 3 ++-
	M st.c \| 16 ++++++++++------
	M st.h \| 1 +

	4 files changed, 15 insertions(+), 8 deletions(-)
	---
	diff --git a/config.def.h b/config.def.h
	t@@ -11,13 +11,14 @@ static int borderpx = 2;
	/*
	* What program is execed by st depends of these precedence rules:
	* 1: program passed with -e
	- * 2: utmp option
	+ * 2: scroll and/or utmp
	* 3: SHELL environment variable
	* 4: value of shell in /etc/passwd
	* 5: value of shell in config.h
	*/
	static char *shell = "/bin/sh";
	char *utmp = NULL;
	+char *scroll = NULL;
	char *stty_args = "stty raw pass8 nl -echo -iexten -cstopb 38400";

	/* identification sequence returned in DA and DECID */
	diff --git a/st.1 b/st.1
	t@@ -170,7 +170,8 @@ See the LICENSE file for the terms of redistribution.
	.SH SEE ALSO
	.BR tabbed (1),
	.BR utmp (1),
	-.BR stty (1)
	+.BR stty (1),
	+.BR scroll (1)
	.SH BUGS
	See the TODO file in the distribution.

	diff --git a/st.c b/st.c
	t@@ -664,7 +664,7 @@ die(const char *errstr, ...)
	void
	execsh(char cmd, char *args)
	{
	- char sh, prog;
	+ char sh, prog, *arg;
	const struct passwd *pw;

	errno = 0;
	t@@ -678,13 +678,17 @@ execsh(char cmd, char *args)
	if ((sh = getenv("SHELL")) == NULL)
	sh = (pw->pw_shell[0]) ? pw->pw_shell : cmd;

	- if (args)
	+ if (args) {
	prog = args[0];
	- else if (utmp)
	- prog = utmp;
	- else
	+ arg = NULL;
	+ } else if (scroll \|\| utmp) {
	+ prog = scroll ? scroll : utmp;
	+ arg = scroll ? utmp : NULL;
	+ } else {
	prog = sh;
	- DEFAULT(args, ((char *[]) {prog, NULL}));
	+ arg = NULL;
	+ }
	+ DEFAULT(args, ((char *[]) {prog, arg, NULL}));

	unsetenv("COLUMNS");
	unsetenv("LINES");
	diff --git a/st.h b/st.h
	t@@ -113,6 +113,7 @@ char xstrdup(char );

	/* config.h globals */
	extern char *utmp;
	+extern char *scroll;
	extern char *stty_args;
	extern char *vtiden;
	extern wchar_t *worddelimiters;