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+// file : libbuild2/functions-filesystem.cxx -*- C++ -*-
+// copyright : Copyright (c) 2014-2019 Code Synthesis Ltd
+// license : MIT; see accompanying LICENSE file
+
+#include <libbutl/filesystem.mxx>
+
+#include <libbuild2/function.hxx>
+#include <libbuild2/variable.hxx>
+
+using namespace std;
+
+namespace build2
+{
+ // Return paths of filesystem entries that match the pattern. See
+ // path_search() overloads (below) for details.
+ //
+ static names
+ path_search (const path& pattern, const optional<dir_path>& start)
+ {
+ names r;
+ auto add = [&r] (path&& p, const std::string&, bool interm) -> bool
+ {
+ // Canonicalizing paths seems to be the right thing to do. Otherwise, we
+ // can end up with different separators in the same path on Windows.
+ //
+ if (!interm)
+ r.emplace_back (
+ value_traits<path>::reverse (move (p.canonicalize ())));
+
+ return true;
+ };
+
+ // Print paths "as is" in the diagnostics.
+ //
+ try
+ {
+ if (pattern.absolute ())
+ path_search (pattern, add);
+ else
+ {
+ // An absolute start directory must be specified for the relative
+ // pattern.
+ //
+ if (!start || start->relative ())
+ {
+ diag_record dr (fail);
+
+ if (!start)
+ dr << "start directory is not specified";
+ else
+ dr << "start directory '" << start->representation ()
+ << "' is relative";
+
+ dr << info << "pattern '" << pattern.representation ()
+ << "' is relative";
+ }
+
+ path_search (pattern, add, *start);
+ }
+ }
+ catch (const system_error& e)
+ {
+ diag_record d (fail);
+ d << "unable to scan";
+
+ // If the pattern is absolute, then the start directory is not used, and
+ // so printing it would be misleading.
+ //
+ if (start && pattern.relative ())
+ d << " '" << start->representation () << "'";
+
+ d << ": " << e
+ << info << "pattern: '" << pattern.representation () << "'";
+ }
+
+ return r;
+ }
+
+ using butl::path_match;
+
+ // Return true if a path for a filesystem entry matches the pattern. See
+ // path_match() overloads (below) for details.
+ //
+ static bool
+ path_match (const path& pattern,
+ const path& entry,
+ const optional<dir_path>& start)
+ {
+ // If pattern and entry are both either absolute or relative and
+ // non-empty, and the first pattern component is not a self-matching
+ // wildcard, then ignore the start directory.
+ //
+ bool rel (pattern.relative () == entry.relative () &&
+ !pattern.empty () && !entry.empty ());
+
+ bool self (!pattern.empty () &&
+ (*pattern.begin ()).find ("***") != string::npos);
+
+ if (rel && !self)
+ return path_match (pattern, entry);
+
+ // The start directory must be specified and be absolute.
+ //
+ if (!start || start->relative ())
+ {
+ diag_record dr (fail);
+
+ // Print paths "as is".
+ //
+ if (!start)
+ dr << "start directory is not specified";
+ else
+ dr << "start directory path '" << start->representation ()
+ << "' is relative";
+
+ dr << info << "pattern: '" << pattern.representation () << "'"
+ << info << "entry: '" << entry.representation () << "'";
+ }
+
+ return path_match (pattern, entry, *start);
+ }
+
+ void
+ filesystem_functions ()
+ {
+ function_family f ("filesystem");
+
+ // path_search
+ //
+ // Return filesystem paths that match the pattern. If the pattern is an
+ // absolute path, then the start directory is ignored (if present).
+ // Otherwise, the start directory must be specified and be absolute.
+ //
+ f["path_search"] = [](path pattern, optional<dir_path> start)
+ {
+ return path_search (pattern, start);
+ };
+
+ f["path_search"] = [](path pattern, names start)
+ {
+ return path_search (pattern, convert<dir_path> (move (start)));
+ };
+
+ f["path_search"] = [](names pattern, optional<dir_path> start)
+ {
+ return path_search (convert<path> (move (pattern)), start);
+ };
+
+ f["path_search"] = [](names pattern, names start)
+ {
+ return path_search (convert<path> (move (pattern)),
+ convert<dir_path> (move (start)));
+ };
+
+ // path_match
+ //
+ // Match a filesystem entry name against a name pattern (both are strings),
+ // or a filesystem entry path against a path pattern. For the latter case
+ // the start directory may also be required (see below). The semantics of
+ // the pattern and name/entry arguments is determined according to the
+ // following rules:
+ //
+ // - The arguments must be of the string or path types, or be untyped.
+ //
+ // - If one of the arguments is typed, then the other one must be of the
+ // same type or be untyped. In the later case, an untyped argument is
+ // converted to the type of the other argument.
+ //
+ // - If both arguments are untyped and the start directory is specified,
+ // then the arguments are converted to the path type.
+ //
+ // - If both arguments are untyped and the start directory is not
+ // specified, then, if one of the arguments is syntactically a path (the
+ // value contains a directory separator), convert them to the path type,
+ // otherwise to the string type (match as names).
+ //
+ // If pattern and entry paths are both either absolute or relative and
+ // non-empty, and the first pattern component is not a self-matching
+ // wildcard (doesn't contain ***), then the start directory is not
+ // required, and is ignored if specified. Otherwise, the start directory
+ // must be specified and be an absolute path.
+ //
+ // Name matching.
+ //
+ f["path_match"] = [](string pattern, string name)
+ {
+ return path_match (pattern, name);
+ };
+
+ // Path matching.
+ //
+ f["path_match"] = [](path pat, path ent, optional<dir_path> start)
+ {
+ return path_match (pat, ent, start);
+ };
+
+ // The semantics depends on the presence of the start directory or the
+ // first two argument syntactic representation.
+ //
+ f["path_match"] = [](names pat, names ent, optional<names> start)
+ {
+ auto path_arg = [] (const names& a) -> bool
+ {
+ return a.size () == 1 &&
+ (a[0].directory () ||
+ a[0].value.find_first_of (path::traits_type::directory_separators) !=
+ string::npos);
+ };
+
+ return start || path_arg (pat) || path_arg (ent)
+ ? path_match (convert<path> (move (pat)), // Match as paths.
+ convert<path> (move (ent)),
+ start
+ ? convert<dir_path> (move (*start))
+ : optional<dir_path> ())
+ : path_match (convert<string> (move (pat)), // Match as strings.
+ convert<string> (move (ent)));
+ };
+ }
+}