From ea4ba29c8d11f46e61d5a4b68c41dffecd6a3daf Mon Sep 17 00:00:00 2001
From: John Ankarstrom <john@ankarstrom.se>
Date: Tue, 6 Jul 2021 22:12:01 +0200
Subject: Add build.1

---
 Makefile |  4 ++++
 build.1  | 84 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 build.1

diff --git a/Makefile b/Makefile
index 5b08578..ec54858 100644
--- a/Makefile
+++ b/Makefile
@@ -1 +1,5 @@
 build: build.c
+
+install:
+	install build /usr/local/bin
+	install -m 644 build.1 /usr/local/man/man1
diff --git a/build.1 b/build.1
new file mode 100644
index 0000000..5180cab
--- /dev/null
+++ b/build.1
@@ -0,0 +1,84 @@
+.Dd $Mdocdate$
+.Dt BUILD 1
+.Os
+.Sh NAME
+.Nm build
+.Nd process and act on embedded build instructions
+.Sh SYNOPSIS
+.Nm
+.Op Fl d
+.Op Fl d
+.Op Fl d
+.Ar file
+.Op Ar ...
+.Sh DESCRIPTION
+.Pp
+.Nm
+is a program which follows simple build instructions
+embedded in source files.
+The number of
+.Fl d
+flags control the printing of debugging information.
+.Pp
+.Nm
+is decidedly not a
+.Xr make 1
+replacement, except in trivial cases.
+In such cases, however,
+it is quite a nice and simple solution.
+It is originally designed for generating
+.Xr troff 1
+documents,
+but can be used with arbitrary source files.
+.Pp
+The first twenty lines of each
+.Ar file
+are scanned for build information.
+Build information is encoded in two ways:
+.Bl -tag -width indent
+.It command line
+[anything] <whitespace> "$ " <shell command> [">" <target>]
+.It dependency line
+[anything] <whitespace> "% " <files separated by whitespace>
+.El
+.Pp
+There can be multiple command lines,
+but only one dependency line.
+.
+.Sh EXAMPLES
+.Pp
+Assuming that the file
+.Pa doc.t
+starts with the following text,
+.Bd -literal -offset indent
+\&.\\" This document is built with the following shell commands:
+\&.\\"   $ refer -p refs doc.t | troff -ms | dpost > doc.ps
+\&.\\"   $ ps2pdf doc.ps > doc.pdf
+\&.\\"   $ rm doc.ps
+\&.
+\&.\\" It depends on the following files:
+\&.\\"   % refs x.tmac
+.Ed
+.Pp
+the invocation
+.Bd -literal -offset indent
+$ build doc.t
+.Ed
+.Pp
+will generate
+.Pa doc.pdf
+by running the given commands,
+depending on the relative modification times of
+.Pa doc.t ,
+.Pa doc.pdf
+and
+.Pa x.tmac .
+.\" .Sh DIAGNOSTICS
+.\" .Sh SEE ALSO
+.\" .Sh STANDARDS
+.\" .Sh HISTORY
+.Sh AUTHORS
+.Nm
+is written by John Ankarström
+.Aq Mt "john (at) ankarstrom.se" .
+.\" .Sh BUGS
-- 
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