NAME

App::hopen - Graph-driven cross-platform build system

CURRENT STATUS

Most features are not yet implemented ;) . However it will generate a Makefile or build.ninja file for a C Hello, World program at this point! It can generate command lines for gcc(1) or for Microsoft's cl.exe.

INTRODUCTION

hopen is a cross-platform software build generator. It makes files you can pass to Make, Ninja, Visual Studio, or other build tools, to compile and link your software. hopen gives you:

• A full, Turing-complete, robust programming language to write your build scripts (specifically, Perl 5.14+)
• No hidden magic! All your data is visible and accessible in a build graph (whence "graph-driven").
• Context-sensitivity. Your users can tweak their own builds for their own platforms without affecting your project.

See App::hopen::Conventions for details of the input format.

Why Perl? Because (1) you probably already have it installed, and (2) it is the original write-once, run-everywhere language!

Example

Create a file .hopen.pl in your source tree. Then:

$ hopen
From ``.'' into ``built''
Running Check phase

Now built/MY.hopen.pl has been created, and loaded with information about your configuration. You can edit that file if you want to change what will happen next.

$ hopen
From ``.'' into ``built''
Running Gen phase

Now built/Makefile has been created.

$ hopen --build
Building in foo/built

And your software is ready to go! make has been run in built/, with output left in built/.

See App::hopen::Conventions for information on writing .hopen.pl files.

SYNOPSIS

hopen [options] [--] [destination dir [project dir]]

If no project directory is specified, the current directory is used.

If no destination directory is specified, <project dir>/built is used.

See App::hopen and App::hopen::Conventions for more details.

OPTIONS

• -a architecture

  Specify the architecture. This is an arbitrary string interpreted by the generator or toolset.

• --build

  Run the generator to process the blueprint files. Cannot be used with --fresh.

• -e Perl code

  Add the Perl code as if it were a hopen file. -e files are processed after all other hopen files, so can modify anything that has been set up by those files. Can be specified more than once.

• --fresh

  Start a fresh build --- ignore any MY.hopen.pl file that may exist in the destination directory. Cannot be used with --build.

• --from project dir

  Specify the project directory. Overrides a project directory given as a positional argument.

• -g generator (or -G)

  Specify the generator. The given generator should be either a full package name or the part after App::hopen::Gen::. Also accepts -G to ease the transition from cmake.

• -t toolset (or -T)

  Specify the toolset. The given toolset should be either a full package name or the part after App::hopen::T::. Also accepts -T to ease the transition from cmake.

• --to destination dir

  Specify the destination directory. Overrides a destination directory given as a positional argument.

• --phase phase

  Specify which phase of the process to run. Note that this overrides whatever is specified in any MY.hopen.pl file, so may cause unexpected results!

  If --phase is given, no other hopen file can set the phase, and hopen will terminate if a file attempts to do so.

• -q

  Produce no output (quiet). Overrides -v.

• -v, --verbose=n

  Verbose. Specify more v's for more verbosity. At present, -vv (equivalently, --verbose=2) gives you detailed traces of the data, and -vvv gives you more detailed code tracebacks on error.

• --version

  Print the version of hopen and exit

INTERNALS

After the hopen file is processed, cycles are detected and reported as errors. *(TODO change this to support LaTeX multi-run files?)* Then the DAG is traversed, and each operation writes the necessary information to the file being generated.

INTERNAL DATA

$RUNNING

Set truthy when a hopen run is in progress. This is so modules don't have to die() if they are being run under perl -c, for example.

TODO replace this with a package parameter --- see "_language_import" in App::hopen::HopenFileKit.

$_hrData

The hashref of the current data we have built up by processing hopen files.

$_did_set_phase

Set to truthy if MY.hopen.pl sets the phase.

$_hf_pkg_idx

Used to give each hopen file or -e a unique package name.

%CMDLINE_OPTS

A hash from internal name to array reference of [getopt-name, getopt-options, optional default-value].

If default-value is a reference, it will be the destination for that value.

INTERNAL FUNCTIONS

_parse_command_line

Takes {into=>hash ref, from=>array ref}. Fills in the hash with the values from the command line, keyed by the keys in "%CMDLINE_OPTS".

_execute_hopen_file

Execute a single hopen file, but do not run the DAG. Usage:

_execute_hopen_file($filename[, options...])

This function takes input from "$_hrData" unless a DATA=>{...} option is given. This function updates "$_hrData" based on the results.

Options are:

• phase

  If given, force the phase to be the one specified.

• quiet

  If truthy, suppress extra output.

• libs

  If given, it must be an arrayref of directories. Each of those will be turned into a use lib statement (see lib) in the generated source.

_run_phase

Run a phase by executing the hopen files and running the DAG. Reads from and writes to "$_hrData", which must be initialized by the caller. Usage:

my $hrDagOutput = _run_phase(files=>[...][, options...])

Options phase, quiet, and libs are as "_execute_hopen_file". Other options are:

• files

  (Required) An arrayref of filenames to run

• norun

  (Optional) if truthy, do not run the DAG. Note that the DAG will also not be run if it is empty.

_inner

Do the work for one invocation of hopen(1). Dies on failure. Main() then translates the die() into a print and error return.

Takes a hash of options.

The return value of _inner is unspecified and ignored.

Main

Command-line runner. Call as App::hopen::Main(\@ARGV).

AUTHOR

Christopher White, cxwembedded at gmail.com

SUPPORT

You can find documentation for this module with the perldoc command.

perldoc App::hopen                      For command-line options
perldoc App::hopen::Conventions         For terminology and workflow
perldoc Data::Hopen                     For the underlying engine

You can also look for information at:

• GitHub: The project's main repository and issue tracker

  https://github.com/hopenbuild/App-hopen

• MetaCPAN

  https://metacpan.org/pod/App::hopen

• This distribution

  See the eg/ directory distributed with this software for examples.

LICENSE AND COPYRIGHT

Copyright (c) 2018--2019 Christopher White. All rights reserved.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA