janet/jpm.1

.TH JPM 1
.SH NAME
jpm \- the Janet Project Manager, a build tool for Janet 
.SH SYNOPSIS
.B jpm
[\fB\-\-flag ...\fR]
[\fB\-\-option=value ...\fR]
.IR command
.IR args ...
.SH DESCRIPTION
jpm is the build tool that ships with a standard Janet install. It is
used for building Janet projects, installing dependencies, installing
projects, building native modules, and exporting your Janet project to a
standalone executable. Although not required for working with Janet, it
removes much of the boilerplate with installing dependencies and
building native modules. jpm requires only Janet to run, and uses git
to install dependencies (jpm will work without git installed).
.SH DOCUMENTATION

jpm has several subcommands, each used for managing either a single Janet project or
all Janet modules installed on the system. Global commands, those that manage modules
at the system level, do things like install and uninstall packages, as well as clear the cache.
More interesting are the local commands. For more information on jpm usage, see https://janet-lang.org/docs/index.html

.SH FLAGS

.TP
.BR \-\-verbose
Print detailed messages of what jpm is doing, including compilation commands and other shell commands.

.SH OPTIONS

.TP
.BR \-\-modpath=/some/path
Set the path to install modules to. Defaults to $JANET_MODPATH, $JANET_PATH, or (dyn :syspath) in that order.

.TP
.BR \-\-headerpath=/some/path
Set the path the jpm will include when building C source code. This lets
you specify the location of janet.h and janetconf.h on your system. On a
normal install, this option is not needed.

.TP
.BR \-\-binpath=/some/path
Set the path that jpm will install scripts and standalone executables to. Executables
defined via declare-execuatble or scripts declared via declare-binscript will be installed
here when jpm install is run. Defaults to $JANET_BINPATH, or a reasonable default for the system.
See JANET_BINPATH for more.

.TP
.BR \-\-libpath=/some/path
Sets the path jpm will use to look for libjanet.a for building standalone executables. libjanet.so
is \fBnot\fR used for building native modules or standalone executables, only
for linking into applications that want to embed janet as a dynamic module.
Linking statically might be a better idea, even in that case. Defaults to
$JANET_LIBPATH, or a reasonable default. See JANET_LIBPATH for more.

.TP
.BR \-\-compiler=cc
Sets the compiler used for compiling native modules and standalone executables. Defaults
to cc.

.TP
.BR \-\-linker=ld
Sets the linker used to create native modules and executables.

.TP
.BR \-\-pkglist=https://github.com/janet-lang/pkgs.git
Sets the git repository for the package listing used to resolve shorthand package names.

.TP
.BR \-\-archiver=ar
Sets the command used for creating static libraries, use for linking into the standalone executable.
Native modules are compiled twice, once a normal native module (shared object), and once as an
archive.

.SH COMMANDS
.TP
.BR help
Shows the usage text and exits immediately.

.TP
.BR build
Builds all artifacts specified in the project.janet file in the current directory. Artifacts will
be created in the ./build/ directory.

.TP
.BR install\ [\fBrepo\fR]

When run with no arguments, installs all installable artifacts in the current project to
the current JANET_MODPATH for modules and JANET_BINPATH for executables and scripts. Can also
take an optional git repository URL and will install all artifacts in that repository instead.
When run with an argument, install does not need to be run from a jpm project directory.

.TP
.BR uninstall\ [\fBname\fR]
Uninstall a project installed with install. uninstall expects the name of the project, not the
repository url, path to installed file or executable name. The name of the project must be specified
at the top of the project.janet file in the declare-project form. If no name is given, uninstalls
the current project if installed.

.TP
.BR clean
Remove all artifacts created by jpm. This just deletes the build folder.

.TP
.BR test
Runs jpm tests. jpm will run all janet source files in the test directory as tests. A test
is considered failing if it exits with a non-zero exit code.

.TP
.BR deps
Install all dependencies that this project requires recursively. jpm does not
resolve dependency issues, like conflicting versions of the same module are required, or
different modules with the same name. Dependencies are installed with git, so deps requires
git to be on the PATH.

.TP
.BR clear-cache
jpm caches git repositories that are needed to install modules from a remote
source in a global cache ($JANET_PATH/.cache). If these dependencies are out of
date or too large, clear-cache will remove the cache and jpm will rebuild it
when needed. clear-cache is a global command, so a project.janet is not
required.

.TP
.BR run\ [\fBrule\fR]
Run a given rule defined in project.janet. Project definitions files (project.janet) usually
contain a few artifact declarations, which set up rules that jpm can then resolve, or execute.
A project.janet can also create custom rules to create arbitrary files or run arbitrary code, much
like make. run will run a single rule or build a single file.

.TP
.BR rules
List all rules that can be run via run. This is useful for exploring rules in the project.

.TP
.BR update-pkgs
Update the package listing by installing the 'pkgs' package. Same as jpm install pkgs

.TP
.BR quickbin [\fBentry\fR] [\fBexecutable\fR]
Create a standalone, statically linked executable from a Janet source file that contains a main function.
The main function is the entry point of the program and will receive command line arguments
as function arguments. The entry file can import other modules, including native C modules, and
jpm will attempt to include the dependencies into the generated executable.

.SH ENVIRONMENT

.B JANET_PATH
.RS
The location to look for Janet libraries. This is the only environment variable Janet needs to
find native and source code modules. If no JANET_PATH is set, Janet will look in
the default location set at compile time, which can be determined with (dyn :syspath)
.RE

.B JANET_MODPATH
.RS
The location that jpm will use to install libraries to. Defaults to JANET_PATH, but you could
set this to a different directory if you want to. Doing so would let you import Janet modules
on the normal system path (JANET_PATH or (dyn :syspath)), but install to a different directory. It is also a more reliable way to install
This variable is overwritten by the --modpath=/some/path if it is provided.
.RE

.B JANET_HEADERPATH
.RS
The location that jpm will look for janet header files (janet.h and janetconf.h) that are used
to build native modules and standalone executables. If janet.h and janetconf.h are available as
default includes on your system, this value is not required. If not provided, will default to
(dyn :syspath)/../../include/janet. The --headerpath=/some/path will override this variable.
.RE

.B JANET_LIBPATH
.RS
Similar to JANET_HEADERPATH, this path is where jpm will look for
libjanet.a for creating standalong executables. This does not need to be
set on a normal install. 
If not provided, this will default to (dyn :syspath)/../../lib.
The --libpath=/some/path will override this variable.
.RE

.B JANET_BINPATH
.RS
The directory where jpm will install binary scripts and executables to.
Defaults to
(dyn :syspath)/../../lib.
The --binpath=/some/path will override this variable.
.RE

.B JANET_PKGLIST
.RS
The git repository URL that contains a listing of packages. This allows installing packages with shortnames, which
is mostly a convenience. However, package dependencies can use short names, package listings
can be used to choose a particular set of dependency versions for a whole project.

.SH AUTHOR
Written by Calvin Rose <calsrose@gmail.com>