On 2022/09/25 21:19:57 +0200, Stefan Sperling <stsp@stsp.name> wrote:
> I think it makes more sense to wait with adding the include feature
> until we see a real need for it. Someone might eventually ask for it
> and present a case, and then we can easily add it.
> To me this seems like one of those features that look simple but may
> have consequences nobody saw ahead of time, leading to problems down
> the road which would not exist if the concepts had been kept simple.

after thinking a bit I agree with you, there's no rush and less code
is better :)

here's a smaller diff only covering the macros then

diff /home/op/w/got-main
commit - e02bf8ada9fce6518a7ad40401425a26bdaadbb4
path + /home/op/w/got-main
blob - db41a6d395d3330ea9e08eca17fb286d7186eba5
file + gotwebd/gotwebd.8
--- gotwebd/gotwebd.8
+++ gotwebd/gotwebd.8
@@ -22,7 +22,7 @@
 .Sh SYNOPSIS
 .Nm
 .Op Fl dnv
-.Op Fl D Ar macro=value
+.Op Fl D Ar macro Ns = Ns Ar value
 .Op Fl f Ar file
 .Sh DESCRIPTION
 .Nm
@@ -38,8 +38,14 @@ Do not daemonize and log to stderr.
 .Bl -tag -width tenletters
 .It Fl d
 Do not daemonize and log to stderr.
-.It Fl D Ar macro=value
-Override the value of a macro used in the configuration file.
+.It Fl D Ar macro Ns = Ns Ar value
+Define
+.Ar macro
+to be set to
+.Ar value .
+Overrides the definition of
+.Ar macro
+in the configuration file.
 .It Fl f Ar file
 Set the path to the configuration file.
 If not specified, the file
blob - b0f31dc628d54ccc683a1c5b00750a7362ebc124
file + gotwebd/gotwebd.conf.5
--- gotwebd/gotwebd.conf.5
+++ gotwebd/gotwebd.conf.5
@@ -29,6 +29,16 @@ Paths mentioned in
 .Sq #
 are treated as comments and ignored.
 .Pp
+Macros can be defined that are later expanded in context.
+Macro names must start with a letter, digit, or underscore, and may
+contain any of those characters, but may not be reserved words.
+Macros are not expanded inside quotes.
+For example:
+.Bd -literal -offset indent
+lan_addr = "192.168.0.1"
+listen on $lan_addr
+.Ed
+.Pp
 Paths mentioned in
 .Nm
 must be relative to
blob - 84e9b08cfad055d23554ebba81fc37fa15e8cdc9
file + gotwebd/parse.y
--- gotwebd/parse.y
+++ gotwebd/parse.y
@@ -131,12 +131,32 @@ grammar		:
 
 %%
 
-grammar		:
+grammar		: /* empty */
 		| grammar '\n'
+		| grammar varset '\n'
 		| grammar main '\n'
 		| grammar server '\n'
+		| grammar error '\n'		{ file->errors++; }
 		;
 
+varset		: STRING '=' STRING	{
+			char *s = $1;
+			while (*s++) {
+				if (isspace((unsigned char)*s)) {
+					yyerror("macro name cannot contain "
+					    "whitespace");
+					free($1);
+					free($3);
+					YYERROR;
+				}
+			}
+			if (symset($1, $3, 0) == -1)
+				fatal("cannot store variable");
+			free($1);
+			free($3);
+		}
+		;
+
 boolean		: STRING {
 			if (strcasecmp($1, "1") == 0 ||
 			    strcasecmp($1, "yes") == 0 ||