autogen

NAME

autogen - The Automated Program Generator

SYNOPSIS

autogen [-flags] [-flag [value]] [--option-name[[=| ]value]] [ <def-file> ]

AutoGen creates text files from templates using external definitions.

DESCRIPTION

AutoGen is designed for generating program files that contain repetitive text with varied substitutions. The goal is to simplify the maintenance of programs that contain large amounts of repetitious text. This is especially valuable if there are several blocks of such text that must be kept synchronized.

One common example is the problem of maintaining the code required for processing program options. Processing options requires a minimum of four different constructs be kept in proper order in different places in your program. You need at least: The flag character in the flag string, code to process the flag when it is encountered, a global state variable or two, and a line in the usage text. You will need more things besides this if you choose to implement long option names, configuration file processing, environment variables and so on.

All of this can be done mechanically; with the proper templates and this program.

OPTIONS

The following options select definitions, templates and scheme functions touse

-L dir, --templ-dirs=dir Search for templates in DIR. This option may
appear an unlimited number of times.

Add a directory to the list of directories autogen searches when opening a
template, either as the primary template or an included one. The last
entry has the highest priority in the search list. That is to say, they
are searched in reverse order.

-T tpl-file, --override-tpl=tpl-file Use TPL-FILE for the template. This
option may not be preset with environment variables or in initialization
(rc) files.

Definition files specify the standard template that is to be expanded.
This option will override that name and expand a different template.

--definitions=file, --no-definitions Read definitions from FILE. The
no-definitions form will disable the option. This option is enabled by
default. This option may not be preset with environment variables or in
initialization (rc) files.

Use this argument to specify the input definitions file with a command line
option. If you do not specify this option, then there must be a command
line argument that specifies the file, even if only to specify stdin with a
hyphen (-). Specify, --no-definitions when you wish to process a template
without any active AutoGen definitions.

--shell=shell name or path name of shell to use.

By default, when AutoGen is built, the configuration is probed for a
reasonable Bourne-like shell to use for shell script processing. If a
particular template needs an alternate shell, it must be specified with
this option on the command line, with an environment variable (SHELL) or in
the configuration/initialization file.

-m, --no-fmemopen Do not use in-mem streams.

If the local C library supports "fopencookie(3GNU)", or "funopen(3BSD)"
then AutoGen prefers to use in-memory stream buffer opens instead of
anonymous files. This may lead to problems if there is a shortage of
virtual memory. If, for a particular application, you run out of memory,
then specify this option. This is unlikely in a modern 64-bit virtual
memory environment.

On platforms without these functions, the option is accepted but ignored.
fmemopen(POSIX) is not adequate because its string buffer is not
reallocatable. open_memstream(POSIX) is also not adequate because the
stream is only opened for output. AutoGen needs a reallocatable buffer
available for both reading and writing.

--equate=char-list characters considered equivalent. The default char-list
for this option is:
_-ˆ

This option will alter the list of characters considered equivalent. The
default are the three characters, "_-ˆ". (The last is conventional on a
Tandem/HP-NonStop, and I used to do a lot of work on Tandems.)

The following options modify how output is handled

-b name, --base-name=name Specify NAME as the base name for output. This
option may not be preset with environment variables or in initialization
(rc) files.

A template may specify the exact name of the output file. Normally, it
does not. Instead, the name is composed of the base name of the
definitions file with suffixes appended. This option will override the
base name derived from the definitions file name. This is required if
there is no definitions file and advisable if definitions are being read
from stdin. If the definitions are being read from standard in, the base
name defaults to stdin. Any leading directory components in the name will
be silently removed. If you wish the output file to appear in a particular
directory, it is recommended that you "cd" into that directory first, or
use directory names in the format specification for the output suffix
lists, see: pseudo macro.

--source-time, --no-source-time set mod times to latest source. The
no-source-time form will disable the option.

If you stamp your output files with the DNE macro output, then your output
files will always be different, even if the content has not really changed.
If you use this option, then the modification time of the output files will
change only if the input files change. This will help reduce unneeded
builds.

--writable, --not-writable Allow output files to be writable. The
not-writable form will disable the option.

This option will leave output files writable. Normally, output files are
read-only.

The following options are often useful while debugging new templates

They specify limits that prevent the template from taking overly long or producing more output than expected.

--loop-limit=lim Limit on increment loops. This option takes an integer
number as its argument. The value of lim is constrained to being:

exactly -1, or
in the range 1 through 0x1000000

The default lim for this option is:
256

This option prevents runaway loops. For example, if you accidentally
specify, "FOR x (for-from 1) (for-to -1) (for-by 1)", it will take a long
time to finish. If you do have more than 256 entries in tables, you will
need to specify a new limit with this option.

-t seconds, --timeout=seconds Limit server shell operations to SECONDS.
This option takes an integer number as its argument. The value of seconds
is constrained to being:

in the range 0 through 3600

AutoGen works with a shell server process. Most normal commands will
complete in less than 10 seconds. If, however, your commands need more
time than this, use this option.

The valid range is 0 to 3600 seconds (1 hour). Zero will disable the
server time limit.

--trace=level tracing level of detail. This option takes a keyword as its
argument. The argument sets an enumeration value that can be tested by
comparing them against the option value macro. The available keywords are:

nothing debug-message server-shell
templates block-macros expressions
everything
or their numeric equivalent.

The default level for this option is:
nothing

This option will cause AutoGen to display a trace of its template
processing. There are six levels, each level including messages from the
previous levels:

nothing Does no tracing at all (default)

debug-message Print messages from the "DEBUG" AutoGen macro (see: DEBUG).

server-shell Traces all input and output to the server shell. This
includes a shell "independent" initialization script about 30 lines long.
Its output is discarded and not inserted into any template.

templates Traces the invocation of DEFINEd macros and INCLUDEs

block-macros Traces all block macros. The above, plus IF, FOR, CASE and
WHILE.

expressions Displays the results of expression evaluations.

everything Displays the invocation of every AutoGen macro, even TEXT macros
(i.e. the text outside of macro quotes). Additionally, if you rebuild the
‘‘expr.ini’’ file with debugging enabled, then all calls to AutoGen defined
scheme functions will also get logged:
cd ${top_builddir}/agen5
DEBUG_ENABLED=true bash bootstrap.dir expr.ini
make CFLAGS=’-g -DDEBUG_ENABLED=1’

Be aware that you cannot rebuild this source in this way without first
having installed the autogen executable in your search path. Because of
this, "expr.ini" is in the distributed source list, and not in the
dependencies.

--trace-out=file tracing output file or filter.

The output specified may be a file name, a file that is appended to, or, if
the option argument begins with the pipe operator (|), a command that will
receive the tracing output as standard in. For example, --traceout=’|
less’ will run the trace output through the less program. Appending to a
file is specified by preceding the file name with two greater-than
characters (>>).

--show-defs Show the definition tree. This option may not be preset with
environment variables or in initialization (rc) files.

This will print out the complete definition tree before processing the
template.

--used-defines Show the definitions used. This option may not be preset
with environment variables or in initialization (rc) files.

This will print out the names of definition values searched for during the
processing of the template, whether actually found or not. There may be
other referenced definitions in a template in portions of the template not
evaluated. Some of the names listed may be computed names and others
AutoGen macro arguments. This is not a means for producing a definitive,
all-encompassing list of all and only the values used from a definition
file. This is intended as an aid to template documentation only.

-C, --core Leave a core dump on a failure exit.

Many systems default to a zero sized core limit. If the system has the
sys/resource.h header and if this option is supplied, then in the failure
exit path, autogen will attempt to set the soft core limit to whatever the
hard core limit is. If that does not work, then an administrator must
raise the hard core size limit. in the definitions files and template
files" They specify which outputs and parts of outputs to produce.

-s suffix, --skip-suffix=suffix Skip the file with this SUFFIX. This
option may appear an unlimited number of times. This option may not be
preset with environment variables or in initialization (rc) files. This
option must not appear in combination with any of the following options:
select-suffix.

Occasionally, it may not be desirable to produce all of the output files
specified in the template. (For example, only the .h header file, but not
the .c program text.) To do this specify --skip-suffix=c on the command
line.

-o suffix, --select-suffix=suffix specify this output suffix. This option
may appear an unlimited number of times. This option may not be preset
with environment variables or in initialization (rc) files.

If you wish to override the suffix specifications in the template, you can
use one or more copies of this option. See the suffix specification in the
@ref{pseudo macro} section of the info doc.

-D value, --define=value name to add to definition list. This option may
appear an unlimited number of times.

The AutoGen define names are used for the following purposes:

Sections of the AutoGen definitions may be enabled or disabled by using
C-style #ifdef and #ifndef directives.

When defining a value for a name, you may specify the index for a
particular value. That index may be a literal value, a define option or a
value #define-d in the definitions themselves.

The name of a file may be prefixed with $NAME/. The $NAME part of the name
string will be replaced with the define-d value for NAME.

When AutoGen is finished loading the definitions, the defined values are
exported to the environment with, putenv(3). These values can then be used
in shell scripts with ${NAME@} references and in templates with (getenv
"NAME").

While processing a template, you may specify an index to retrieve a
specific value. That index may also be a define-d value.

It is entirely equivalent to place this name in the exported environment.
Internally, that is what AutoGen actually does with this option.

-U name-pat, --undefine=name-pat definition list removal pattern. This
option may appear an unlimited number of times. This option may not be
preset with environment variables or in initialization (rc) files.

Similar to ’C’, AutoGen uses #ifdef/#ifndef preprocessing directives. This
option will cause the matching names to be removed from the list of defined
values.

This option is used to automate dependency tracking

-M type, --make-dep [type] emit make dependency file. This option may
appear an unlimited number of times. This option may not be preset with
environment variables or in initialization (rc) files.

This option behaves fairly closely to the way the -M series of options work
with the gcc compiler, except that instead of just emitting the predecessor
dependencies, this also emits the successor dependencies (output target
files). By default, the output dependency information will be placed in
<base-name>.d, but may also be specified with -MF<file>. The time stamp on
this file will be manipulated so that it will be one second older than the
oldest primary output file.

The target in this dependency file will normally be the dependency file
name, but may also be overridden with -MT<targ-name>. AutoGen will not
alter the contents of that file, but it may create it and it will adjust
the modification time to match the start time.

NB: these second letters are part of the option argument, so -MF <file>
must have the space character quoted or omitted, and -M "F <file>" is
acceptable because the F is part of the option argument.

-M may be followed by any of the letters M, F, P, T, Q, D, or G. However,
only F, Q, T and P are meaningful. All but F have somewhat different
meanings. -MT<name> is interpreted as meaning <name> is a sentinel file
that will depend on all inputs (templates and definition files) and all the
output files will depend on this sentinel file. It is suitable for use as
a real make target. Q is treated identically to T, except dollar
characters (’$’) are doubled. P causes a special clean (clobber) phoney
rule to be inserted into the make file fragment. An empty rule is always
created for building the list of targets.

This is the recommended usage:
-MFwhatever-you-like.dep -MTyour-sentinel-file -MP
and then in your Makefile, make the autogen rule:
-include whatever-you-like.dep
clean_targets += clean-your-sentinel-file
.sp
your-sentinel-file:
autogen -MT$@@ -MF$*.d .....
.sp
local-clean :
rm -f $(clean_targets)

The modification time on the dependency file is adjusted to be one second
before the earliest time stamp of any other output file. Consequently, it
is suitable for use as the sentinel file testifying to the fact the program
was successfully run. (-include is the GNU make way of specifying "include
it if it exists". Your make must support that feature or your bootstrap
process must create the file.)

All of this may also be specified using the DEPENDENCIES_OUTPUT or
AUTOGEN_MAKE_DEP environment variables. If defined, dependency information
will be output. If defined with white space free text that is something
other than true, false, yes, no, 0 or 1, then the string is taken to be an
output file name. If it contains a string of white space characters, the
first token is as above and the second token is taken to be the target
(sentinel) file as -MT in the paragraphs above. DEPENDENCIES_OUTPUT will
be ignored if there are multiple sequences of white space characters or if
its contents are, specifically, false, no or 0.

help, version, option and error handling

--no-abort Do not abort on errors.

By default, AutoGen will abort on an error leaving behind a core image.
That is sometimes inconvenient. If present on the command line or in the
environment, AutoGen will call exit(1) instead of abort().

-?, --help Display usage information and exit.

-!, --more-help Pass the extended usage information through a pager.

-> [cfgfile], --save-opts [=cfgfile] Save the option state to cfgfile. The
default is the last configuration file listed in the OPTION PRESETS
section, below. The command will exit after updating the config file.

-< cfgfile, --load-opts=cfgfile, --no-load-opts Load options from cfgfile.
The no-load-opts form will disable the loading of earlier config/rc/ini
files. --no-load-opts is handled early, out of order.

-v [{v|c|n --version [{v|c|n}]}] Output version of program and exit. The
default mode is ‘v’, a simple version. The ‘c’ mode will print copyright
information and ‘n’ will print the full copyright notice.

OPTION PRESETS

Any option that is not marked as not presettable may be preset by loading values from configuration ("RC" or ".INI") file(s) and values from environment variables named:
AUTOGEN_<option-name> or AUTOGEN
The environmental presets take precedence (are processed later than) the configuration files. The homerc files are "$HOME", and ".". If any of these are directories, then the file .autogenrc is searched for within those directories.

ENVIRONMENT

See OPTION PRESETS for configuration environment variables.

FILES

See OPTION PRESETS for configuration files.

EXAMPLES

Here is how the man page is produced:

autogen -Tagman-cmd.tpl -MFman-dep -MTstamp-man opts.def

This command produced this man page from the AutoGen option definition file. It overrides the template specified in opts.def (normally options.tpl) and uses agman-cmd.tpl. It also sets the make file dependency output to man-dep and the sentinel file (time stamp file) to man-stamp. The base of the file name is derived from the defined prog-name.

The texi invocation document is produced via:

autogen -Tagtexi-cmd.tpl -MFtexi-dep -MTtexi-stamp opts.def

EXIT STATUS

One of the following exit values will be returned:
0 (EXIT_SUCCESS) Successful program execution.

1 (EXIT_OPTION_ERROR) The command options were misconfigured.

2 (EXIT_BAD_TEMPLATE) An error was encountered processing the
template.

3 (EXIT_BAD_DEFINITIONS) The definitions could not be deciphered.

4 (EXIT_LOAD_ERROR) An error was encountered during the load phase.

5 (EXIT_FS_ERROR) a file system error stopped the program.

6 (EXIT_NO_MEM) Insufficient memory to operate.

128 (EXIT_SIGNAL) autogen exited due to catching a signal. If your
template includes string formatting, a number argument to a "%s"
formatting element will trigger a segmentation fault. Autogen will
catch the seg fault signal and exit with AUTOGEN_EXIT_SIGNAL(5).
Alternatively, AutoGen may have been interrupted with a kill(2)
signal. Subtract 128 from the actual exit code to detect the signal
number.

66 (EX_NOINPUT) A specified configuration file could not be loaded.

70 (EX_SOFTWARE) libopts had an internal operational error. Please
report it to autogen-users@lists.sourceforge.net. Thank you.

AUTHORS

Bruce Korb

COPYRIGHT

Copyright (C) 1992-2018 Bruce Korb all rights reserved. This program is released under the terms of the GNU General Public License, version 3 or later.

BUGS

Please send bug reports to: autogen-users@lists.sourceforge.net

NOTES

This manual page was AutoGen-erated from the autogen option definitions.