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// file : build2/file -*- C++ -*-
// copyright : Copyright (c) 2014-2017 Code Synthesis Ltd
// license : MIT; see accompanying LICENSE file
#ifndef BUILD2_FILE
#define BUILD2_FILE
#include <map>
#include <build2/types>
#include <build2/utility>
#include <build2/scope>
#include <build2/variable> // list_value
namespace build2
{
class target;
class location;
class prerequisite_key;
using subprojects = std::map<string, dir_path>;
extern const dir_path build_dir; // build
extern const dir_path bootstrap_dir; // build/bootstrap
extern const path root_file; // build/root.build
extern const path bootstrap_file; // build/bootstrap.build
extern const path src_root_file; // build/bootstrap/src-root.build
extern const path export_file; // build/export.build
extern const path config_file; // build/config.build
bool
is_src_root (const dir_path&);
bool
is_out_root (const dir_path&);
// Given an src_base directory, look for a project's src_root based on the
// presence of known special files. Return empty path if not found. Note
// that if the input is normalized/actualized, then the output will be as
// well.
//
dir_path
find_src_root (const dir_path&);
// The same as above but for project's out. Note that we also check whether
// a directory happens to be src_root, in case this is an in-tree build. The
// second argument is the out flag that is set to true if this is src_root.
// Note that if the input is normalized/actualized, then the output will be
// as well.
//
dir_path
find_out_root (const dir_path&, bool* src = nullptr);
// If buildfile is '-', then read from STDIN.
//
void
source (const path& buildfile, scope& root, scope& base);
// As above but first check if this buildfile has already been sourced for
// the base scope. Return false if the file has already been sourced.
//
bool
source_once (const path& buildfile, scope& root, scope& base);
// As above but checks against the specified scope rather than base.
//
bool
source_once (const path& buildfile, scope& root, scope& base, scope& once);
// Create project's root scope. Only set the src_root variable if the
// passed src_root value is not empty.
//
scope&
create_root (const dir_path& out_root, const dir_path& src_root);
// Setup root scope. Note that it assume the src_root variable
// has already been set.
//
void
setup_root (scope&);
// Setup the base scope (set *_base variables, etc).
//
scope&
setup_base (scope_map::iterator,
const dir_path& out_base,
const dir_path& src_base);
// Return a scope for the specified directory (first). Note that switching
// to this scope might also involve switch to a new root scope (second) if
// the new scope is in another project. In the new scope is not in any
// project, then NULL is returned in second.
//
pair<scope&, scope*>
switch_scope (scope& root, const dir_path&);
// Bootstrap the project's root scope, the out part.
//
void
bootstrap_out (scope& root);
// Bootstrap the project's root scope, the src part. Return true if
// we loaded anything (which confirms the src_root is not bogus).
//
bool
bootstrap_src (scope& root);
// Return true if this scope has already been bootstrapped, that is, the
// following calls have already been made:
//
// bootstrap_out()
// setup_root()
// bootstrap_src()
//
bool
bootstrapped (scope& root);
// Create and bootstrap outer root scopes, if any. Loading is
// done by load_root_pre() below.
//
void
create_bootstrap_outer (scope& root);
// Create and bootstrap inner root scopes between root and base,
// if any. Return the innermost created root scope or root if
// none were created. Loading is done by load_root_pre() below.
//
scope&
create_bootstrap_inner (scope& root, const dir_path& out_base);
// Load project's root[-pre].build unless already loaded. Also
// make sure all outer root scopes are loaded prior to loading
// this root scope.
//
void
load_root_pre (scope& root);
// Extract the specified variable value from a buildfile. It is expected to
// be the first non-comment line and not to rely on any variable expansion
// other than those from the global scope or any variable overrides. Return
// an indication of whether the variable was found.
//
pair<value, bool>
extract_variable (const path&, const char* var);
// Import has two phases: the first is triggered by the import
// directive in the buildfile. It will try to find and load the
// project. Failed that, it will return the project-qualified
// name of the target which will be used to create a project-
// qualified prerequisite. This gives the rule that will be
// searching this prerequisite a chance to do some target-type
// specific search. For example, a C++ link rule can search
// for lib{} prerequisites in the C++ compiler default library
// search paths (so that we end up with functionality identical
// to -lfoo). If, however, the rule didn't do any of that (or
// failed to find anything usable), it calls the standard
// prerequisite search() function which sees this is a project-
// qualified prerequisite and goes straight to the second phase
// of import. Here, currently, we simply fail but in the future
// this will be the place where we can call custom "last resort"
// import hooks. For example, we can hook a package manager that
// will say, "Hey, I see you are trying to import foo and I see
// there is a package foo available in repository bar. Wanna
// download and use it?"
//
names
import (scope& base, name, const location&);
target&
import (const prerequisite_key&);
}
#include <build2/file.ixx>
#endif // BUILD2_FILE
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