g.tmac: Add c (code) macro, rework margins

1 files changed, 42 insertions, 9 deletions

diff --git a/example.t b/example.t
index 3ca19bb..1ea01b1 100644
--- a/example.t
+++ b/example.t
@@ -1,26 +1,26 @@
 .so g.tmac
-.s
+.p
+.ta 3n +3n +3n +3n
 .t
 .x Mg ,
 a simple macro package for troff
 .n
 John Ankarstr\[u00F6]m
 .d
+.h
+Introduction
 .p
 .i Mg
 is a simple macro package for troff with the following features:
 .p
-1.
-It is designed to be easy to understand and to customize
+1.	It is designed to be easy to understand and to customize
 by editing the source code.
 .p
-2.
-It makes use of the extended support for environments
+2.	It makes use of the extended support for environments
 offered by many modern troff implementations
 (but it can be made compatible with the original troff if need be).
 .p
-3.
-It is designed to be practically easy to use.
+3.	It is designed to be practically easy to use.
 Macros are consistently one letter long and written in lowercase.
 .p
 While
@@ -33,7 +33,7 @@ Users of
 .i mg
 are encouraged to modify the source code
 according to their own needs.
-.h
+.s
 Internal design
 .p
 .i Mg
@@ -52,4 +52,37 @@ simply sets the font size inside the environment named
 If the user wishes to modify the default font size,
 he or she can simply switch to the
 .i p
-environment and set the font size as desired.
+environment and set the font size as desired:
+.c
+.eo
+.cc ,
+.\" set heading font
+.h
+.fam H
+.ps +1p
+,cc
+.ec
+.p
+The environments are initialized
+as soon as the first
+.q block-level
+macro is called.
+At the initialization of each environment,
+the default environment (0) is copied,
+meaning that all environment-relevant settings
+defined before the first macro call
+are applied to all
+.i mg
+environments.
+It is thus remarkably simple and intuitive to set,
+for example, the default font of a document:
+.c
+.cc ,
+.fam N
+.t
+Document title
+.p
+First paragraph.
+,cc
+.p
+\&...