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authorRoland Pesch <pesch@cygnus>1991-03-18 22:52:40 +0000
committerRoland Pesch <pesch@cygnus>1991-03-18 22:52:40 +0000
commit06f2bdbf17bef6866ff19555f19c1d1329aafc62 (patch)
tree485f712e1d1dc77de2c01ec2ef21bd6bffb6eb2c /gas
parent402c81bfc0594270bfbb5fcc9af590993b66d645 (diff)
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Introduced macro _CS__ for calculated chapter/section/sub... level headings.
Diffstat (limited to 'gas')
-rw-r--r--gas/doc/pretex.m430
1 files changed, 30 insertions, 0 deletions
diff --git a/gas/doc/pretex.m4 b/gas/doc/pretex.m4
index 826c128..da62d49 100644
--- a/gas/doc/pretex.m4
+++ b/gas/doc/pretex.m4
@@ -219,4 +219,34 @@ _define__(
<<>_dnl__<>>,
<_popf__<>_ifelse__(0,_IF_FS__,
<_divert__<>_dnl__<>>,<>)>)>)
+
+D. CHAPTER/SECTION MACRO
+In a parametrized manual, the heading level may need to be calculated;
+for example, a manual that has a chapter on machine dependencies
+should be conditionally structured as follows:
+ - IF the manual is configured for a SINGLE machine type, use
+the chapter heading for that machine type, and run headings down
+from there (top level for a particular machine is chapter, then within
+that we have section, subsection etc);
+ - ELSE, if MANY machine types are described in the chapter,
+use a generic chapter heading such as "@chapter Machine Dependencies",
+use "section" for the top level description of EACH machine, and run
+headings down from there (top level for a particular machine is
+section, then within that we have subsection, subsubsection etc).
+
+The macro <_CS__> is for this purpose: its argument is evaluated (so
+you can construct expressions to express choices such as above), then
+expands as follows:
+ 0: @chapter
+ 1: @section
+ 2: @subsection
+ 3: @subsubsection
+ ...and so on.
+
+_define__(<_CS__>,<@_cs__(_eval__($1))>)
+_define__(<_cs__>,<_ifelse__(
+ 0, $1, <chapter>,
+ 1, $1, <section>,
+ <sub<>_cs__(_eval__($1 - 1))>)>)
+
_divert__<>_dnl__<>