.\" Copyright (c) 2022 Omar Polo <op@openbsd.org>
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
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.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd September 27, 2022
.Dt TEMPLATE 1
.Os
.Sh NAME
.Nm template
.Nd templating system compiler
.Sh SYNOPSIS
.Nm
.Op Fl G
.Op Ar
.Sh DESCRIPTION
.Nm
is an utility that converts files written in the
.Xr template 7
format format to a set of routine writtens in the C programming
language.
.Nm
converts the files given as arguments or from standard input, and
writes to standard output.
.Pp
The options are as follows:
.Bl -tag -width Ds
.It Fl G
Do not emit debug info in the generated source.
It's disabled by default, unless
.Nm
is reading from standard input.
.El
.Sh EXIT STATUS
.Ex
.Sh EXAMPLES
The following example shows how to use
.Nm
in a Makefile:
.Bd -literal -offset indent
\&.SUFFIXES: .c .tmpl
\&.c.tmpl:
	template $< > $@ || rm \-f $@
.Ed
.Sh SEE ALSO
.Xr template 7
.Sh AUTHORS
.An -nosplit
The
.Nm
utility was written by
.An Omar Polo Aq Mt op@openbsd.org .
.Sh CAVEATS
The compiler is very naive, so there are quite a few shortcomings:
.Bl -bullet -compact
.It
No attempt is made to validate the C code provided inline, nor the
validity of the arguments to many constructs.
.It
The generated code assumes that a variable called
.Va tp
of type
.Vt struct template *
is in scope inside the template.
.It
Each block may have additional variables used for the template
generation: to avoid clashes, don't define variables with the
.Sq tp_
prefix.
.It
Blanks are, in most cases, trimmed.
Normally this is not a problem, but a workaround is needed in case
they need to be preserved, for e.g.:
.Bd -literal -offset indent
Name: {{ " " }} {{ render name_field(tp) }}
.Ed
.El