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Detect the correct version of python at runtime and store the result

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for later calls. The check is only performed on the major version
number, such as to avoid using python 3.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@40049 a592a061-630c-0410-9148-cb99ea01b6c8
This commit is contained in:
Enrico Forestieri 2011-10-28 11:51:48 +00:00
parent e02df14faa
commit 775466100f
2 changed files with 71 additions and 7 deletions
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18
src/support/Systemcall.cpp
View File

@ -100,8 +100,13 @@ ProgressInterface* ProgressInterface::instance()
int Systemcall::startscript(Starttype how, string const & what,
std::string const & path, bool /*process_events*/)
{
string command =
to_filesystem8bit(from_utf8(latexEnvCmdPrefix(path))) + what;
string const python_call = "python -tt";
string command = to_filesystem8bit(from_utf8(latexEnvCmdPrefix(path)));
if (prefixIs(what, python_call))
command += os::python() + what.substr(python_call.length());
else
command += what;
if (how == DontWait) {
switch (os::shell()) {
@ -162,9 +167,16 @@ string const parsecmd(string const & inputcmd, string & outfile)
bool in_single_quote = false;
bool in_double_quote = false;
bool escaped = false;
string const python_call = "python -tt";
string cmd;
int start = 0;
for (size_t i = 0; i < inputcmd.length(); ++i) {
if (prefixIs(inputcmd, python_call)) {
cmd = os::python();
start = python_call.length();
}
for (size_t i = start; i < inputcmd.length(); ++i) {
char c = inputcmd[i];
if (c == '\'') {
if (in_double_quote || escaped) {

60
src/support/os.cpp
View File

@ -4,13 +4,19 @@
* Licence details can be found in the file COPYING.
*
* \author Ruurd A. Reitsma
* \author Enrico Forestieri
*
* Full author contact details are available in file CREDITS.
*/
#include <config.h>
#if defined(__CYGWIN__) || defined(__CYGWIN32__)
#include "filetools.h"
#include "qstring_helpers.h"
#include <QDir>
#if defined(__CYGWIN__)
#include "support/os_cygwin.cpp"
#elif defined(_WIN32)
#include "support/os_win32.cpp"
@ -31,11 +37,57 @@ namespace lyx {
namespace support {
namespace os {
static string const python2(string const & binary, bool verbose = false)
{
if (verbose)
lyxerr << "Examining " << binary << "\n";
// Check whether this is a python 2 binary.
cmd_ret const out = runCommand(binary + " -V 2>&1");
if (out.first < 0 || !prefixIs(out.second, "Python 2"))
return string();
if (verbose)
lyxerr << "Found " << out.second << "\n";
return binary;
}
string const python()
{
// Use the -tt switch so that mixed tab/whitespace indentation is
// an error
static string const command("python -tt");
// Check whether the first python in PATH is the right one.
static string command = python2("python -tt");
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 ...\n";
for (; it != end; ++it) {
QString const dir = toqstr(*it);
string const localdir = dir.toLocal8Bit().constData();
QDir qdir(dir);
qdir.setFilter(QDir::Files | QDir::Executable);
QStringList list = qdir.entryList(QStringList("python*"));
for (int i = 0; i < list.size() && command.empty(); ++i) {
string const binary = addName(localdir,
list.at(i).toLocal8Bit().constData());
command = python2(binary, true);
}
}
// Default to "python" if no usable binary was found.
if (command.empty()) {
lyxerr << "Warning: No python v2.x binary found.\n";
command = "python";
}
// Add the -tt switch so that mixed tab/whitespace
// indentation is an error
command += " -tt";
}
return command;
}