3 * This file is part of LyX, the document processor.
4 * Licence details can be found in the file COPYING.
6 * \author Ruurd A. Reitsma
7 * \author Enrico Forestieri
9 * Full author contact details are available in file CREDITS.
14 #include "support/convert.h"
15 #include "support/debug.h"
16 #include "support/filetools.h"
17 #include "support/qstring_helpers.h"
18 #include "support/regex.h"
22 #if defined(__CYGWIN__)
23 #include "support/os_cygwin.cpp"
25 #include "support/os_win32.cpp"
27 #include "support/os_unix.cpp"
30 // Static assert to break compilation on platforms where
31 // int/unsigned int is not 4 bytes. Added to make sure that
32 // e.g., the author hash is always 32-bit.
33 template<bool Condition> struct static_assert_helper;
34 template <> struct static_assert_helper<true> {};
36 dummy = sizeof(static_assert_helper<sizeof(int) == 4>)
43 static string const python23(string const & binary, bool verbose = false)
45 const string version_info = " -c 'from __future__ import print_function;import sys; print(sys.version_info[:2], end=\"\")'";
46 static regex const python_reg("\\((\\d*), (\\d*)\\)");
48 lyxerr << "Examining " << binary << "\n";
50 // Check whether this is a python 2 or 3 binary.
51 cmd_ret const out = runCommand(binary + version_info);
54 if (out.first < 0 || !regex_match(out.second, sm, python_reg))
57 int major = convert<int>(sm.str(1));
58 int minor = convert<int>(sm.str(2));
59 if((major == 2 && minor < 7) || (major == 3 && minor < 4))
63 lyxerr << "Found Python " << out.second << "\n";
74 string const python(bool reset)
76 // This function takes inspiration from PEP 394 and PEP 397
77 // PEP 394 -- The "python" Command on Unix-Like Systems
78 // https://www.python.org/dev/peps/pep-0394/
79 // PEP 397 -- Python launcher for Windows
80 // https://www.python.org/dev/peps/pep-0397/
82 // Check whether python3 in PATH is the right one.
83 static string command = python23("python3");
86 command = python23("python3");
89 // python3 does not exists, let us try to find python3.x in PATH
90 // the search is probably broader than required
91 // but we are trying hard to find a valid python binary
92 if (command.empty()) {
93 vector<string> const path = getEnvPath("PATH");
94 lyxerr << "Looking for python 3.x ...\n";
95 for (auto bin: path) {
96 QString const dir = toqstr(bin);
97 string const localdir = dir.toLocal8Bit().constData();
99 qdir.setFilter(QDir::Files | QDir::Executable);
100 QStringList list = qdir.entryList(QStringList("python3*"));
101 for (int i = 0; i < list.size() && command.empty(); ++i) {
102 string const binary = addName(localdir,
103 list.at(i).toLocal8Bit().constData());
104 command = python23(binary, true);
109 // python 3 was not found let us look for python 2
111 command = python23("python2");
113 // python2 does not exists, let us try to find python2.x in PATH
114 // the search is probably broader than required
115 // but we are trying hard to find a valid python binary
116 if (command.empty()) {
117 vector<string> const path = getEnvPath("PATH");
118 lyxerr << "Looking for python 2.x ...\n";
119 for (auto bin: path) {
120 QString const dir = toqstr(bin);
121 string const localdir = dir.toLocal8Bit().constData();
123 qdir.setFilter(QDir::Files | QDir::Executable);
124 QStringList list = qdir.entryList(QStringList("python2*"));
125 for (int i = 0; i < list.size() && command.empty(); ++i) {
126 string const binary = addName(localdir,
127 list.at(i).toLocal8Bit().constData());
128 command = python23(binary, true);
134 // Default to "python" if no usable binary was found.
135 // If this happens all hope is lost that this is a sane system
136 if (command.empty()) {
137 lyxerr << "Warning: No python v2.x or 3.x binary found.\n";
141 // Add the -tt switch so that mixed tab/whitespace
142 // indentation is an error
148 } // namespace support