NAME

       jbuilder-subst - Substitute watermarks in source files.

SYNOPSIS

       jbuilder subst [OPTION]...

DESCRIPTION

       Substitute %%ID%% strings in source files, in a similar fashion to what topkg does in the
       default configuration.

       This command is only meant to be called when a user pins a package to its development
       version. Especially it replaces 1.0+beta14 strings by the version obtained from the vcs.
       Currently only git is supported and the version is obtained from the output of:

         $ git describe --always --dirty

       jbuilder subst substitutes the variables that topkg substitutes with the defatult
       configuration:
       - %%NAME%%, the name of the package
       - %%VERSION%%, output of git describe --always --dirty
       - %%VERSION_NUM%%, same as 1.0+beta14 but with a potential leading 'v' or 'V' dropped
       - %%VCS_COMMIT_ID%%, commit hash from the vcs
       - %%PKG_MAINTAINER%%, contents of the maintainer: field from the opam file
       - %%PKG_AUTHORS%%, contents of the authors: field from the opam file
       - %%PKG_HOMEPAGE%%, contents of the homepage: field from the opam file
       - %%PKG_ISSUES%%, contents of the issues: field from the opam file
       - %%PKG_DOC%%, contents of the doc: field from the opam file
       - %%PKG_LICENSE%%, contents of the license: field from the opam file
       - %%PKG_REPO%%, contents of the repo: field from the opam file

       It is not possible to customize this list. If you wish to do so you need to configure
       topkg instead and use it to perform the substitution.

       Note that the expansion of jbuilder is guessed using the following heuristic: if all the
       <package>.opam files in the current directory are prefixed by the shortest package name,
       this prefix is used. Otherwise you must specify a name with the -n command line option.

       In order to call jbuilder subst when your package is pinned, add this line to the build:
       field of your opam file:

         ["jbuilder" "subst"] {pinned}

OPTIONS

       --help[=FMT] (default=auto)
           Show this help in format FMT. The value FMT must be one of `auto', `pager', `groff' or
           `plain'. With `auto', the format is `pager` or `plain' whenever the TERM env var is
           `dumb' or undefined.

       -n NAME, --name=NAME
           Use this package name instead of detecting it.

       --version
           Show version information.

COMMON OPTIONS

       These options are common to all commands.

       --debug-backtraces
           Always print exception backtraces.

       --debug-dependency-path
           In case of error, print the dependency path from the targets on the command line to
           the rule that failed.

       --debug-findlib
           Debug the findlib sub-system.

       --dev
           Use stricter compilation flags by default.

       -j JOBS (absent=4)
           Run no more than JOBS commands simultaneously.

       --no-buffer
           Do not buffer the output of commands executed by jbuilder. By default jbuilder buffers
           the output of subcommands, in order to prevent interleaving when multiple commands are
           executed in parallel. However, this can be an issue when debugging long running tests.
           With --no-buffer, commands have direct access to the terminal. Note that as a result
           their output won't be captured in the log file. You should use this option in
           conjunction with -j 1, to avoid interleaving. Additionally you should use --verbose as
           well, to make sure that commands are printed before they are being executed.

       --only-packages=PACKAGES
           Ignore stanzas referring to a package that is not in PACKAGES. PACKAGES is a
           comma-separated list of package names. Note that this has the same effect as deleting
           the relevant stanzas from jbuild files. It is mostly meant for releases. During
           development, it is likely that what you want instead is to build a particular
           <package>.install target.

       -p PACKAGES, --for-release-of-packages=PACKAGES
           Shorthand for --root . --only-packages PACKAGE. You must use this option in your
           <package>.opam files, in order to build only what's necessary when your project
           contains multiple packages as well as getting reproducible builds.

       --root=DIR
           Use this directory as workspace root instead of guessing it. Note that this option
           doesn't change the interpretation of targets given on the command line. It is only
           intended for scripts.

       --verbose
           Print detailed information about commands being run

       --workspace=FILE
           Use this specific workspace file instead of looking it up.

MORE HELP

       Use `jbuilder COMMAND --help' for help on a single command.

BUGS

       Check bug reports at https://github.com/janestreet/jbuilder/issues