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Change python run time detection to privilege python 3 over python 2.

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This should work as before but now we also control the python version and ignore it if it is not in the supported range.
This commit is contained in:
José Matos 2019-06-07 15:27:25 +01:00
parent 44e88a4c13
commit adb779a692
1 changed files with 55 additions and 21 deletions
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64
src/support/os.cpp
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@ -11,9 +11,11 @@
#include <config.h>
#include "support/convert.h"
#include "support/debug.h"
#include "support/filetools.h"
#include "support/qstring_helpers.h"
#include "support/regex.h"
#include <QDir>
@ -40,18 +42,25 @@ namespace os {
static string const python23(string const & binary, bool verbose = false)
{
const string version_info = " -c 'from __future__ import print_function;import sys; print(sys.version_info[:2], end=\"\")'";
static regex const python_reg("\\((\\d*), (\\d*)\\)");
if (verbose)
lyxerr << "Examining " << binary << "\n";
// Check whether this is a python 2 or 3 binary.
cmd_ret const out = runCommand(binary + " -V 2>&1");
if (out.first < 0 ||
(!prefixIs(out.second, "Python 2") &&
!prefixIs(out.second, "Python 3")))
cmd_ret const out = runCommand(binary + version_info);
smatch sm;
if (out.first < 0 || !regex_match(out.second, sm, python_reg))
return string();
int major = convert<int>(sm.str(1));
int minor = convert<int>(sm.str(2));
if((major == 2 and minor < 7) or (major == 3 and minor < 4))
return string();
if (verbose)
lyxerr << "Found " << out.second << "\n";
lyxerr << "Found Python " << out.second << "\n";
return binary;
}
@ -64,26 +73,25 @@ int timeout_min()
string const python(bool reset)
{
// Check whether the first python in PATH is the right one.
static string command = python23("python -tt");
// Check whether python3 in PATH is the right one.
static string command = python23("python3");
// FIXME THREAD
if (reset) {
command = python23("python -tt");
command = python23("python3");
}
// python3 does not exists, let us try python3.x
if (command.empty()) {
// It was not, so check whether we can find it elsewhere in
// PATH, maybe with some suffix appended.
vector<string> const path = getEnvPath("PATH");
vector<string>::const_iterator it = path.begin();
vector<string>::const_iterator const end = path.end();
lyxerr << "Looking for python v2.x or 3.x ...\n";
for (; it != end; ++it) {
QString const dir = toqstr(*it);
lyxerr << "Looking for python 3.x ...\n";
for (auto bin: path) {
QString const dir = toqstr(bin);
string const localdir = dir.toLocal8Bit().constData();
QDir qdir(dir);
qdir.setFilter(QDir::Files | QDir::Executable);
QStringList list = qdir.entryList(QStringList("python*"));
QStringList list = qdir.entryList(QStringList("python3*"));
for (int i = 0; i < list.size() && command.empty(); ++i) {
string const binary = addName(localdir,
list.at(i).toLocal8Bit().constData());
@ -91,7 +99,34 @@ string const python(bool reset)
}
}
}
// python 3 not found let us look for python 2
if (command.empty())
command = python23("python2");
// python2 does not exists, let us try python2.x
if (command.empty()) {
// It was not, so check whether we can find it elsewhere in
// PATH, maybe with some suffix appended.
vector<string> const path = getEnvPath("PATH");
lyxerr << "Looking for python 3.x ...\n";
for (auto bin: path) {
QString const dir = toqstr(bin);
string const localdir = dir.toLocal8Bit().constData();
QDir qdir(dir);
qdir.setFilter(QDir::Files | QDir::Executable);
QStringList list = qdir.entryList(QStringList("python2*"));
for (int i = 0; i < list.size() && command.empty(); ++i) {
string const binary = addName(localdir,
list.at(i).toLocal8Bit().constData());
command = python23(binary, true);
}
}
}
// Default to "python" if no usable binary was found.
// If this happens all hope is lost that there is a sane system
if (command.empty()) {
lyxerr << "Warning: No python v2.x or 3.x binary found.\n";
command = "python";
@ -100,7 +135,6 @@ string const python(bool reset)
// Add the -tt switch so that mixed tab/whitespace
// indentation is an error
command += " -tt";
}
return command;
}