src/main/cpp/blaze_util.h

// Copyright 2014 The Bazel Authors. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//    http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// blaze_util.h: Miscellaneous utility functions used by the blaze.cc
//               Blaze client.
//

#ifndef BAZEL_SRC_MAIN_CPP_BLAZE_UTIL_H_
#define BAZEL_SRC_MAIN_CPP_BLAZE_UTIL_H_

#include <sys/types.h>

#include <sstream>
#include <string>
#include <vector>

namespace blaze {

extern const char kServerPidFile[];

// TODO(laszlocsomor) 2016-11-21: remove kServerPidSymlink after 2017-05-01
// (~half a year from writing this comment). By that time old Bazel clients that
// used to write PID symlinks will probably no longer be in use.
extern const char kServerPidSymlink[];

// Returns the given path in absolute form.  Does not change paths that are
// already absolute.
//
// If called from working directory "/bar":
//   MakeAbsolute("foo") --> "/bar/foo"
//   MakeAbsolute("/foo") ---> "/foo"
//   MakeAbsolute("C:/foo") ---> "C:/foo"
std::string MakeAbsolute(const std::string &path);

// If 'arg' matches 'key=value', returns address of 'value'.
// If it matches 'key' alone, returns address of next_arg.
// Returns NULL otherwise.
const char* GetUnaryOption(const char *arg,
                           const char *next_arg,
                           const char *key);

// Returns true iff 'arg' equals 'key'.
// Dies with a syntax error if arg starts with 'key='.
// Returns false otherwise.
bool GetNullaryOption(const char *arg, const char *key);

// Searches for 'key' in 'args' using GetUnaryOption. Arguments found after '--'
// are omitted from the search.
// Returns true iff key is a flag in args.
const char* SearchUnaryOption(const std::vector<std::string>& args,
                              const char* key);

// Searches for 'key' in 'args' using GetNullaryOption. Arguments found after
// '--' are omitted from the search.
// Returns the value of the 'key' flag iff it occurs in args.
bool SearchNullaryOption(const std::vector<std::string>& args,
                         const char* key);

// Enable messages mostly of interest to developers.
bool VerboseLogging();

// Read the JVM version from a string. The string should contain the output of a
// "java -version" execution and is supposed to contain a string of the form
// 'version "version-number"' in the first 255 bytes. If the string is found,
// version-number is returned, else the empty string is returned.
std::string ReadJvmVersion(const std::string &version_string);

// Returns true iff jvm_version is at least the version specified by
// version_spec.
// jvm_version is supposed to be a string specifying a java runtime version
// as specified by the JSR-56 appendix A. version_spec is supposed to be a
// version is the format [0-9]+(.[1-9]+)*.
bool CheckJavaVersionIsAtLeast(const std::string &jvm_version,
                               const std::string &version_spec);

// Returns true iff arg is a valid command line argument for bazel.
bool IsArg(const std::string& arg);

// Returns the string representation of `value`.
// Workaround for mingw where std::to_string is not implemented.
// See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=52015.
template <typename T>
std::string ToString(const T &value) {
  std::ostringstream oss;
  oss << value;
  return oss.str();
}

}  // namespace blaze

#endif  // BAZEL_SRC_MAIN_CPP_BLAZE_UTIL_H_