# NAME

`bdep-new` – create and initialize new project

# SYNOPSIS

`bdep new [options] [--no-init] spec [name]
bdep new [options] --config-add|-A cfg-dir [@cfg-name] spec [name]
bdep new [options] --config-create|-C cfg-dir [@cfg-name] spec [name]
[cfg-args]
bdep new [options] --package [prj-spec] spec [name]
bdep new [options] --source [prj-spec] spec [name]`

`spec = [lang] [type] [vcs]
lang = --lang|-l (c|c++)[,lang-opt...]
type = --type|-t (exe|lib|bare|empty)[,type-opt...]
vcs = --vcs|-s (git|none)[,vcs-opt...]
prj-spec = --directory|-d prj-dir
cfg-args = [-- [bpkg-options]] [--existing|-e | (module | cfg-var)...]`

# DESCRIPTION

The `new` command creates and initializes a new project (the first three forms), a new package in an already existing project (the `--package` form), or a new source subdirectory in an already existing project/package (the `--source` form). All the forms except `--source` first create according to `spec` a new `build2` project/package called `name` in the `name` subdirectory of the current working directory (unless overridden with `--output-dir|-o` or, in case of `--package`, with `--directory|-d`). If `name` contains a directory component, then the project/package is created in this directory, as if it was specified with `--output-dir|-o`.

The first form then, unless the `--no-init` option is specified, initializes an empty project database as if by executing the `bdep-init(1)` command with the `--empty` option. For example:

    $ bdep new -l c++ -t exe hello

    $ tree hello/
    hello/
    ├── hello/
    │   ├── hello.cxx
    │   └── buildfile
    ├── buildfile
    └── manifest

Similarly, the second and third forms add an existing or create a new build configuration and then initialize the project in that configuration as if by executing the `bdep-init(1)` command with the `--config-add` or `--config-create` option, respectively. For example:

    $ bdep new -l c++ -t exe -C @gcc hello cc config.cxx=g++

The `--package` form adds the new package to the `packages.manifest` file creating it if necessary. If no project directory is explicitly specified with `--directory|-d`, then it will be deduced from the current working directory (see `bdep-projects-configs(1)` for details on specifying projects). Note that nested packages are not allowed. For example:

    $ bdep new -t empty hello
    $ cd hello

    $ bdep new --package -l c++ -t lib libhello
    $ bdep new --package -l c++ -t exe hello

    $ bdep init -C @gcc cc config.cxx=g++

    $ cd ..
    $ tree hello/
    hello/
    ├── hello/
    │   ├── hello/
    │   │   ├── hello.cxx
    │   │   └── buildfile
    │   ├── buildfile
    │   └── manifest
    ├── libhello/
    │   ├── libhello/
    │   │   ├── hello.hxx
    │   │   ├── hello.cxx
    │   │   └── buildfile
    │   ├── buildfile
    │   └── manifest
    └── packages.manifest

The `--source` form operates as-if by first creating according to `spec` a temporary project called `name` and then copying its source subdirectory (`name/name/` by default) over to the current working directory (unless overridden with `--output-dir|-o`). If no project/package directory is explicitly specified with `--directory|-d`, then the current working directory is assumed. For example:

    $ bdep new -l c++ -t bare hello
    $ cd hello

    $ bdep new --source -l c++ -t lib libhello
    $ bdep new --source -l c++ -t exe hello

    $ bdep init -C @gcc cc config.cxx=g++

    $ cd ..
    $ tree hello/
    hello/
    ├── hello/
    │   ├── hello.cxx
    │   └── buildfile
    ├── libhello/
    │   ├── hello.hxx
    │   ├── hello.cxx
    │   └── buildfile
    ├── buildfile
    └── manifest

In all the forms, if `name` is omitted, then the current working directory name (unless overridden with `--output-dir|-o`) is used as the project/package/source subdirectory name. See Package Name for details on project/package names.

The source subdirectory can be customized with the `subdir` project type sub-option (see below for details). For example:

    $ bdep new -l c++ -t lib,subdir=libhello/io libhello-io

    $ tree libhello-io/
    libhello-io/
    └── libhello/
        └── io/
            ├── hello-io.hxx
            └── hello-io.cxx

By default the source subdirectory is created in the project/package root directory and contains both headers (including public headers for libraries) as well as sources. This can be customized in a number of ways using the `prefix*` and `split` project type sub-options (see below for details). For example, to move the source subdirectory inside `src/`:

    $ bdep new -l c++ -t exe,prefix=src hello

    $ tree hello/
    hello/
    └── src/
        └── hello/
            └── hello.cxx

And to split the library source subdirectory into public headers and other source files:

    $ bdep new -l c++ -t lib,split libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── libhello/
    │       └── hello.hxx
    └── src/
        └── libhello/
            └── hello.cxx

See the SOURCE LAYOUT section below for details and more examples.

The output directory may already contain existing files provided they don't clash with the files to be created. The `new` command also recognizes certain well-known files and tries to use the extracted information in the package `manifest` file. Specifically, it tries to guess the license from the `LICENSE` file as well as extract the summary from `README.md`. This allows for the following workflow:

    # Create a project with LICENSE and README.md on one of the Git
    # hosting services (GitHub, GitLab, etc).

    $ git clone .../libhello.git
    $ cd libhello

    $ bdep new -l c++ -t lib

The project parameters such as language, type (executable, library, etc), and version control system can be customized as described next. Some of these parameters also support parameter-specific sub-options (such as the file extensions to use in a C++ project) that can be specified with a comma after the parameter value.

The project language can be specified with the `--lang|-l` option. Valid values for this option and their semantics are described next. If unspecified, a C++ project is created by default.

`c`
  A C project. Recognized language sub-options:
`c++`
  A C project that can also use C++. If specified, then the `hxx`, `cxx`, `ixx`, `txx`, and `mxx` `c++` language sub-options can also be specified.

`c++`
  A C++ project. Recognized language sub-options:
`cpp`
  Use the `.cpp`, `.hpp`, `.ipp`, `.tpp`, and `.mpp` source file extensions (alias for `extension=?pp`).
`extension=pattern`
  Derive source file extensions from `pattern` by replacing every `?` with one of the `c` (source), `h` (header), `i` (inline), `t` (template), or `m` (module interface) letters. If unspecified and no individual extensions are specified with the below options, then `?xx` is used by default.
`hxx=extension`
  Use the specified `extension` for header files instead of the default `.hxx`.
`cxx=extension`
  Use the specified `extension` for source files instead of the default `.cxx`.
`ixx=extension`
  Use the specified `extension` for inline files. If unspecified, then assume no inline files are used by the project.
`txx=extension`
  Use the specified `extension` for template files. If unspecified, then assume no template files are used by the project.
`mxx=extension`
  Use the specified `extension` for module interface files. If unspecified, then assume no modules are used by the project.
`c`
  A C++ project that can also use C.

As an example, the following command creates a header-only C++ library that uses the `.h` extension for header files and `.cpp` – for source files:

    $ bdep new -l c++,hxx=h,cxx=cpp -t lib,binless libhello

The project type can be specified with the `--type|-t` option. The `empty` project type is language-agnostic with the semantics and valid sub-options for the rest being language-dependent, as described next. If unspecified, an executable project is created by default.

`exe`
  A project that builds a sample C or C++ executable. Recognized executable project sub-options:
`no-tests`
  Don't add support for functional/integration testing.
`unit-tests`
  Add support for unit testing.
`no-install`
  Don't add support for installing.
`export-stub`
  Add support for importing this project's targets from other projects.
`prefix=dir`
  Optional source prefix relative to project/package root.
`subdir=dir`
  Alternative source subdirectory relative to source prefix.
`no-subdir`
  Omit the source subdirectory.
`buildfile-in-prefix`
  Create the `buildfile` in the source prefix directory rather than in its source subdirectory.
`third-party`
  Create a package for converting an existing third-party executable to `build2`. This sub-option automatically enables the `no-readme` sub-option. It also adds a number of values to `manifest` that makes sense to specify in a package of a third-party project and, unless `no-package-readme` is specified, generates the `PACKAGE-README.md` template (see `package-description` package manifest value for background).
`license=name`
`no-readme`
`no-package-readme`
`alt-naming`
  See `common` sub-options below.

`lib`
  A project that builds a sample C or C++ library. Recognized library project sub-options:
`binless`
  Create a header-only library.
`no-tests`
  Don't add support for functional/integration testing.
`unit-tests`
  Add support for unit testing.
`no-install`
  Don't add support for installing.
`no-version`
  Don't add support for generating the version header.
`no-symexport`
  Don't add support for DLL symbol exporting.
`auto-symexport`
  Add support for automatic DLL symbol exporting.
`prefix-include=dir`
  Optional public header prefix relative to project/package root.
`prefix-source=dir`
  Optional source prefix relative to project/package root.
`prefix=dir`
  Shortcut for `prefix-include=dir,prefix-source=dir`.
`split`
  Shortcut for `prefix-include=include,prefix-source=src`.
`subdir=dir`
  Alternative source subdirectory relative to header/source prefix.
`no-subdir-include`
  Omit the source subdirectory relative to the header prefix.
`no-subdir-source`
  Omit the source subdirectory relative to the source prefix.
`no-subdir`
  Shortcut for `no-subdir-include,no-subdir-source`.
`buildfile-in-prefix`
  Create the `buildfiles` in the header/source prefix directories rather than in their source subdirectories.
`third-party`
  Create a package for converting an existing third-party library to `build2`. This sub-option automatically enables the `no-version` and `no-readme` sub-options as well as `no-symexport` unless `auto-symexport` is specified. It also adds a number of values to `manifest` that makes sense to specify in a package of a third-party project and, unless `no-package-readme` is specified, generates the `PACKAGE-README.md` template (see `package-description` package manifest value for background).
`license=name`
`no-readme`
`no-package-readme`
`alt-naming`
  See `common` sub-options below.

`bare`
  A project without any source code that can be filled later (see `--source`). Recognized bare project sub-options:
`no-tests`
  Don't add support for testing.
`no-install`
  Don't add support for installing.
`license=name`
`no-readme`
`alt-naming`
  See `common` sub-options below.

`empty`
  An empty project that can be filled with packages (see `--package`). Recognized empty project sub-options:
`third-party`
  Create a project for converting an existing third-party project to `build2`. This sub-option adjusts the generated `README.md` template wording to reflect such a conversion.
`no-readme`
  See `common` sub-options below.

`common`
  Common project type sub-options:
`license=name`
  Specify the project's license. The license name can be an SPDX License Expression, which, in its simplest form, is just the license ID. Or it can be a free form name in the `other:` license name scheme. If unspecified, then `other: proprietary` is assumed. The following tables lists the most commonly used free/open source software license IDs as well as a number of pre-defined `other:` names. See the `license` package manifest value for more information.

      MIT                MIT License.

      BSD-2-Clause       BSD 2-Clause "Simplified" License
      BSD-3-Clause       BSD 3-Clause "New" or "Revised" License

      GPL-3.0-only       GNU General Public License v3.0 only
      GPL-3.0-or-later   GNU General Public License v3.0 or later

      LGPL-3.0-only      GNU Lesser General Public License v3.0 only
      LGPL-3.0-or-later  GNU Lesser General Public License v3.0 or later

      AGPL-3.0-only      GNU Affero General Public License v3.0 only
      AGPL-3.0-or-later  GNU Affero General Public License v3.0 or later

      Apache-2.0         Apache License 2.0

      MPL-2.0            Mozilla Public License 2.0

      BSL-1.0            Boost Software License 1.0

      Unlicense          The Unlicense (public domain)

      other: public domain     Released into the public domain
      other: available source  Not free/open source with public source code
      other: proprietary       Not free/open source
      other: TODO              License is not yet decided

`no-readme`
  Don't add new `README.md` (but still check for the existing one).
`no-package-readme`
  Don't add new `PACKAGE-README.md` (but still check for the existing one).
`alt-naming`
  Use the alternative build file/directory naming scheme.

The project version control system can be specified with the `--vcs|-s` option. Valid values for this option and their semantics are described next. If unspecified, `git` is assumed by default.

`git`
  Initialize a `git(1)` repository inside the project and generate `.gitignore` files. Recognized version control system sub-options:
`branch=name`
  Use the specified name for the initial branch in the newly created repository.

`none`
  Don't initialize a version control system inside the project.

The created project, package, or source subdirectory can be further customized using the pre and post-creation hooks specified with the `--pre-hook` and `--post-hook` options, respectively. The pre hooks are executed before any new files are created and the post hook – after all the files have been created. The hook commands are executed in the project, package, or source directory as their current working directory. For example:

    $ bdep new --post-hook "echo .idea/ >>.gitignore" hello

The pre hooks are primarily useful for moving/renaming existing files that would otherwise clash with files created by the `new` command. For example:

    $ bdep new --pre-hook  "mv .gitignore .gitignore.bak" \
               --post-hook "cat .gitignore.bak >>.gitignore" \
               --post-hook "rm .gitignore.bak" ...

See the `--pre-hook` and `--post-hook` options documentation below for details.

# NEW OPTIONS

`--no-init`
  Don't initialize an empty build configuration set.
`--package`
  Create a new package inside an already existing project rather than a new project.
`--source`
  Create a new source subdirectory inside an already existing project or package rather than a new project.
`--output-dir`|`-o` `dir`
  Create the project, package, or source subdirectory in the specified directory.
`--directory`|`-d` `dir`
  Assume the project/package is in the specified directory rather than in the current working directory. Only used with `--package` or `--source`.
`--type`|`-t` `type`[,`opt`...]
  Specify project type and options. Valid values for `type` are `exe` (executable project, default), `lib` (library project), `bare` (bare project without any source code), and `empty` (empty project ready to be filled with packages). Valid values for `opt` are type-specific.
`--lang`|`-l` `lang`[,`opt`...]
  Specify project language and options. Valid values for `lang` are `c` and `c++` (default). Valid values for `opt` are language-specific.
`--vcs`|`-s` `vcs`[,`opt`...]
  Specify project version control system and options. Valid values for `vcs` are `git` (default) and `none`. Valid values for `opt` are system-specific.
`--pre-hook` `command`
`--post-hook` `command`
  Run the specified command before/after creating the project, package, or source directory.

  The `command` value is interpreted as a whitespace-separated, potentially quoted command line consisting of a program or a portable builtin optionally followed by arguments and redirects. Specifically, a single level of quotes (either single or double) is removed and whitespaces are not treated as separators inside such quoted fragments. Currently only the `stdout` redirect to a file is supported. For example:

      $ bdep new --post-hook "echo '.idea/ # IDE' >>.gitignore" hello

  The command line elements (program, arguments, etc) may optionally contain substitutions – variable names enclosed with the `@` substitution symbol – which are replaced with the corresponding variable values to produce the actual command. The following variable names are recognized with the double substitution symbol (`@@`) serving as an escape sequence.

      @mode@ - one of 'project', 'package', or 'source'
      @name@ - project, package, or source subdirectory name
      @base@ - name base (name without extension)
      @stem@ - name stem (name base without 'lib' prefix)
      @root@ - project/package root directory
      @pfx@  - combined prefix relative to project/package root
      @inc@  - split header prefix relative to project/package root
      @src@  - split source prefix relative to project/package root
      @sub@  - source subdirectory relative to header/source prefix
      @type@ - type (--type|-t value: 'exe', 'lib', etc)
      @lang@ - language (--lang|-l value: 'c', 'c++', etc)
      @vcs@  - version control system (--vcs|-s value: 'git', etc)

  Note that the `@inc@` and `@src@` variables are only set if the header/source prefix is split with the combined `@pfx@` variable set otherwise.

  For example:

      $ bdep new --post-hook "echo bin/ >>@name@/.gitignore" hello

  These substitution variables are also made available to the hook program as the `BDEP_NEW_*` environment variables (`BDEP_NEW_MODE`, `BDEP_NEW_NAME`, etc).

`--no-amalgamation`
  Create a project with disabled amalgamation support. This option is normally only used for testing.
`--no-checks`
  Suppress nested project/package checks. This option is normally only used for testing.
`--config-add`|`-A` `dir`
  Add an existing build configuration `dir`.
`--config-create`|`-C` `dir`
  Create a new build configuration in `dir`.
`--type`|`--config-type` `typ`
  The type of the configuration being created. By default, configuration of type `target` is created. See `bpkg-cfg-create(1)` for background on configuration types.
`--default`
  Make the added or created configuration the default.
`--no-default`
  Don't make the first added or created configuration the default.
`--forward`
  Make the added or created configuration forwarded.
`--no-forward`
  Don't make the added or created configuration forwarded.
`--auto-sync`
  Make the added or created configuration automatically synchronized.
`--no-auto-sync`
  Don't make the added or created configuration automatically synchronized.
`--existing`|`-e`
  Initialize a `bpkg` configuration based on an existing build system configuration.
`--wipe`
  Wipe the configuration directory clean before creating the new configuration.
`--config-name`|`-n` `name`
  Specify the build configuration as a name.
`--config-id` `num`
  Specify the build configuration as an id.

# COMMON OPTIONS

The common options are summarized below with a more detailed description available in `bdep-common-options(1)`.

`-v`
  Print essential underlying commands being executed.
`-V`
  Print all underlying commands being executed.
`--quiet`|`-q`
  Run quietly, only printing error messages.
`--verbose` `level`
  Set the diagnostics verbosity to `level` between 0 and 6.
`--stdout-format` `format`
  Representation format to use for printing to `stdout`.
`--jobs`|`-j` `num`
  Number of jobs to perform in parallel.
`--progress`
  Display progress indicators for long-lasting operations, such as network transfers, building, etc.
`--no-progress`
  Suppress progress indicators for long-lasting operations, such as network transfers, building, etc.
`--diag-color`
  Use color in diagnostics.
`--no-diag-color`
  Don't use color in diagnostics.
`--bpkg` `path`
  The package manager program to be used for build configuration management.
`--bpkg-option` `opt`
  Additional option to be passed to the package manager program.
`--build` `path`
  The build program to be used to build packages.
`--build-option` `opt`
  Additional option to be passed to the build program.
`--curl` `path`
  The curl program to be used for network operations.
`--curl-option` `opt`
  Additional option to be passed to the curl program.
`--offline`
  Do not attempt to download resources (packages, repository metadata, etc), instead taking them from the local fetch cache if available and failing otherwise.
`--no-fetch-cache`
  Disable local caching of download resources (packages, repository metadata, etc).
`--fetch-cache` `mode`
  Comma-separated list of local fetch cache modes.
`--fetch-cache-session` `id`
  The local fetch cache session.
`--sqlite-synchronous` `mode`
  Filesystem synchronization mode for the project SQLite database.
`--pager` `path`
  The pager program to be used to show long text.
`--pager-option` `opt`
  Additional option to be passed to the pager program.
`--options-file` `file`
  Read additional options from `file`.
`--default-options` `dir`
  The directory to load additional default options files from.
`--no-default-options`
  Don't load default options files.

# SOURCE LAYOUT

C and C++ projects employ a bewildering variety of source code layouts most of which fit into two broad classes: combined, where all the source code for a single executable or library resides in the same directory and split, where headers (typically public headers of a library) and other source files reside in separate directories (most commonly called `include/` and `src/`).

To support the creation of such varying layouts the `new` command divides paths leading to source code inside a package/project into a number of customizable components:

    libhello/{include,src}/hello/
        ^         ^          ^
        |         |          |
     project/   source    source
     package    prefix  subdirectory
      root

Note that while the same physical layout can be achieved with various combinations of source prefix and subdirectory, there will be differences in semantics since the headers in the project are included with the source subdirectory (if any) as a prefix. See Canonical Project Structure for rationale and details.

As we have already seen, the source subdirectory can be customized with the `subdir` project type sub-option. For example:

    # libhello/hello/

    $ bdep new -l c++ -t lib,subdir=hello libhello

    $ tree libhello/
    libhello/
    └── hello/
        ├── hello.hxx
        └── hello.cxx

Note: pass `-l c++,cpp` if you prefer the `.hpp`/`.cpp` source file naming scheme.

The source prefix can be combined, in which case it can be customized with the single `prefix` project type sub-option. For example:

    # hello/src/hello/

    $ bdep new -l c++ -t exe,prefix=src hello

    $ tree hello/
    hello/
    └── src/
        └── hello/
            └── hello.cxx

The prefix can also be split, in which case the `prefix-include` and `prefix-source` sub-options can be used to customize the respective directories independently. If either is omitted, then the corresponding prefix is left empty. For example:

    # libhello/{include,.}/libhello/

    $ bdep new -l c++ -t lib,prefix-include=include libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── libhello/
    │       └── hello.hxx
    └── libhello/
        └── hello.cxx

The `split` sub-option is a convenient shortcut for the most common case where the header prefix is `include/` and source prefix is `src/`. For example:

    # libhello/{include,src}/libhello/

    $ bdep new -l c++ -t lib,split libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── libhello/
    │       └── hello.hxx
    └── src/
        └── libhello/
            └── hello.cxx

The source subdirectory can be omitted by specifying the `no-subdir` project type sub-option. For example:

    # hello/src/

    $ bdep new -l c++ -t exe,prefix=src,no-subdir hello

    $ tree hello/
    hello/
    └── src/
        └── hello.cxx

The same but for the split layout (we also have to disable the generated version header that is not supported in this layout):

    # libhello/{include,src}/

    $ bdep new -l c++ -t lib,split,no-subdir,no-version libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── hello.hxx
    └── src/
        └── hello.cxx

To achieve the layout where all the source code resides in the project root, we omit both the source prefix and subdirectory (we also have to disable a couple of other features that are not supported in this layout):

    # hello/

    $ bdep new -l c++ -t lib,no-subdir,no-version,no-tests libhello

    $ tree libhello/
    libhello/
    ├── hello.cxx
    └── hello.hxx

We can also omit the source subdirectory but only in the source prefix of the split layout by specifying the `no-subdir-source` sub-option. For example:

    # libhello/{include/hello,src}/

    $ bdep new -l c++ -t lib,split,subdir=hello,no-subdir-source libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── hello/
    │       └── hello.hxx
    └── src/
        └── hello.cxx

Similarly, we can also omit the source subdirectory but only in the header prefix of the split layout by specifying the `no-subdir-include` sub-option (we also have to disable the generated version header that is not supported in this layout):

    # libhello/{include,src/hello}/

    $ bdep new                                                         \
      -l c++                                                           \
      -t lib,split,subdir=hello,no-subdir-include,no-version           \
      libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── hello.hxx
    └── src/
        └── hello/
            └── hello.cxx

To achieve the split layout where the `include/` directory is inside `src/`:

    # libhello/src/{include,.}/hello/

    $ bdep new                                                         \
      -l c++                                                           \
      -t lib,prefix-include=src/include,prefix-source=src,subdir=hello \
      libhello

    $ tree libhello/
    libhello/
    └── src/
        ├── include/
        │   └── hello/
        │       └── hello.hxx
        └── hello/
            └── hello.cxx

A similar layout but without the source subdirectory in `src/`:

    # libhello/src/{include/hello,.}/

    $ bdep new                                                         \
      -l c++                                                           \
      -t lib,prefix-include=src/include,prefix-source=src,\
    subdir=hello,no-subdir-source                                      \
      libhello

    $ tree libhello/
    libhello/
    └── src/
        ├── include/
        │   └── hello/
        │       └── hello.hxx
        └── hello.cxx

The layout used by the Boost libraries:

    # libhello/{include/hello,libs/hello/src}/

    $ bdep new                                                         \
      -l c++                                                           \
      -t lib,prefix-include=include,prefix-source=libs/hello/src,\
    subdir=hello,no-subdir-source                                      \
      libhello

    $ tree libhello/
    libhello/
    ├── include/
    │   └── hello/
    │       └── hello.hxx
    └── libs/
        └── hello/
            └── src/
                └── hello.cxx

A layout where multiple components each have their own `include/src` split:

    # hello/libhello1/{include/hello1,src}/
    # hello/libhello2/{include/hello2,src}/

    $ bdep new -l c++ -t bare hello

    $ bdep new -d hello --source                                       \
      -l c++                                                           \
      -t lib,\
    prefix-include=libhello1/include,prefix-source=libhello1/src,\
    subdir=hello1,no-subdir-source                                     \
      libhello1

    $ bdep new -d hello --source                                       \
      -l c++                                                           \
      -t lib,\
    prefix-include=libhello2/include,prefix-source=libhello2/src,\
    subdir=hello2,no-subdir-source                                     \
      libhello2

    $ tree hello/
    hello/
    ├── libhello1/
    │   ├── include/
    │   │   └── hello1/
    │   │       └── hello1.hxx
    │   └── src/
    │       └── hello1.cxx
    └── libhello2/
        ├── include/
        │   └── hello2/
        │       └── hello2.hxx
        └── src/
            └── hello2.cxx

A layout where libraries and executables have different prefixes:

    # hello/libs/libhello/{include/hello,src}/
    # hello/src/hello/

    $ bdep new -l c++ -t bare hello

    $ bdep new -d hello --source                                       \
      -l c++                                                           \
      -t lib,\
    prefix-include=libs/libhello/include,prefix-source=libs/libhello/src,\
    subdir=hello,no-subdir-source                                      \
      libhello

    $ bdep new -d hello --source -l c++ -t exe,prefix=src hello

    $ tree hello/
    hello/
    ├── libs/
    │   └── libhello/
    │       ├── include/
    │       │   └── hello/
    │       │       └── hello.hxx
    │       └── src/
    │           └── hello.cxx
    └── src/
        └── hello/
            └── hello.cxx

When packaging a third-party project for `build2`, one of the common approaches is to create a project with the split layout and the `buildfiles` in the source prefix directories rather than in the source subdirectories:

    # hello/libhello/{include,src}/hello/
    # hello/libhello/{include,src}/buildfile

    $ bdep new -l c -t empty hello

    $ bdep new -d hello --package                                      \
      -l c                                                             \
      -t lib,                                                          \
    split,subdir=hello,no-version,no-symexport,buildfile-in-prefix     \
      libhello

    $ tree hello/
    hello/
    └── libhello/
        ├── include/
        │   ├── buildfile
        │   └── hello/
        │       └── hello.h
        └── src/
            ├── buildfile
            └── hello/
                └── hello.c

After that the upstream project is added as a `git` submodule to the project root directory and the source subdirectories are replaced with the symbolic links to the directories inside the upstream project directory:

    $ tree hello/
    hello/
    ├── libhello/
    │   ├── include/
    │   │   ├── buildfile
    │   │   └── hello/ -> ../../upstream/include/hello/
    │   └── src/
    │       ├── buildfile
    │       └── hello/ -> ../../upstream/src/
    └── upstream/
        ├── include/
        │   └── hello/
        │       └── hello.h
        └── src/
            └── hello.c

# DEFAULT OPTIONS FILES

See `bdep-default-options-files(1)` for an overview of the default options files. For the `new` command the search start directory is the project directory in the package and source modes and the parent directory of the new project in all other modes. The following options files are searched for in each directory and, if found, loaded in the order listed:

    bdep.options
    bdep-{config config-add}.options                # if --config-add|-A
    bdep-{config config-add config-create}.options  # if --config-create|-C
    bdep-new.options
    bdep-new-{project|package|source}.options # (mode-dependent)

The following `new` command options cannot be specified in the default options files:

    --output-dir|-o
    --directory|-d
    --package
    --source
    --no-checks
    --config-add|-A
    --config-create|-C
    --wipe

While the presence of the `--pre-hook` or `--post-hook` options in remote default options files will trigger a prompt.

# ENVIRONMENT

The `BDEP_AUTHOR_EMAIL` environment variable can be used to specify the package email address. If not set, the `new` command will first try to obtain the email from the version control system (if used) and then from the `EMAIL` environment variable. If all these methods fail, a dummy `you@example.org` email is used.

# BUGS

Send bug reports to the users@build2.org mailing list.