Introduce the possibility of setting a prefix for the TEXINPUTS environment

variable. This is done in the preferences, much like as the PATH prefix.
A single '.' in the paths will get replaced with the current document dir
and also non-absolute paths will be prefixed with that dir.

The default semantics of TEXINPUTS apply, such that, for example, if a
path is terminated with a double slash, all subdirectories will be also
searched by both the TeX engine and ancillary programs such as dvi
previewers or dvips. As an example, if the prefix is set to ".:figs", the
TEXINPUTS variable will be set as ".:<docdir>:<docdir>/figs:$ORIGTEXINPUTS",
where <docdir> is the document directory.

The initial '.' is necessary to address the actual current dir (this will
be the temp dir at preview time), while if TEXINPUTS was initially unset,
such that $ORIGTEXINPUTS is empty, a colon (or semicolon on Windows) will
end the path list. This is very important, because we don't want to replace
the system directories but to complement them and, in order to do that, an
empty element has to be present in the list. Indeed, according to the
TEXINPUTS semantics, an empty element means the standard search path.
This works whether TEXINPUTS is originally set or not, because if the
original TEXINPUTS starts with a colon (meaning that the standard search
path is wanted there) we will have an empty element at that point,
otherwise the final colon will simply serve as a path separator.

Of course, on Windows a ';' has to be used as a path separator. LyX will
take care of transforming the platform path list into one understandable
by the TeX engine. For example, this will be the case for a Cygwin version
of LyX using a native Windows TeX engine or viceversa. I tested all of
this and it works for me.


git-svn-id: svn://svn.lyx.org/lyx/lyx-devel/trunk@38681 a592a061-630c-0410-9148-cb99ea01b6c8

src/Buffer.cpp

@@ -2083,7 +2083,7 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 
 		// Execute the command in the background
 		Systemcall call;
-		call.startscript(Systemcall::DontWait, command);
+		call.startscript(Systemcall::DontWait, command, filePath());
 		break;
 	}
 
@@ -2261,7 +2261,8 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 				command2 += quoteName(psname);
 				// First run dvips.
 				// If successful, then spool command
-				res = one.startscript(Systemcall::Wait, command);
+				res = one.startscript(Systemcall::Wait, command,
+						      filePath());
 
 				if (res == 0) {
 					// If there's no GUI, we have to wait on this command. Otherwise,
@@ -2269,7 +2270,8 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 					// file, before it can be printed!!
 					Systemcall::Starttype stype = use_gui ?
 						Systemcall::DontWait : Systemcall::Wait;
-					res = one.startscript(stype, command2);
+					res = one.startscript(stype, command2,
+							      filePath());
 				}
 			} else {
 				// case 2: print directly to a printer
@@ -2278,7 +2280,8 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 				// as above....
 				Systemcall::Starttype stype = use_gui ?
 					Systemcall::DontWait : Systemcall::Wait;
-				res = one.startscript(stype, command + quoteName(dviname));
+				res = one.startscript(stype, command +
+						quoteName(dviname), filePath());
 			}
 
 		} else {
@@ -2301,7 +2304,7 @@ void Buffer::dispatch(FuncRequest const & func, DispatchResult & dr)
 			// as above....
 			Systemcall::Starttype stype = use_gui ?
 				Systemcall::DontWait : Systemcall::Wait;
-			res = one.startscript(stype, command);
+			res = one.startscript(stype, command, filePath());
 		}
 
 		if (res == 0) 

src/Converter.cpp

@@ -307,7 +307,7 @@ bool Converters::convert(Buffer const * buffer,
 			LYXERR(Debug::FILES, "No converter defined! "
 				   "I use convertDefault.py:\n\t" << command);
 			Systemcall one;
-			one.startscript(Systemcall::Wait, command);
+			one.startscript(Systemcall::Wait, command, buffer->filePath());
 			if (to_file.isReadableFile()) {
 				if (conversionflags & try_cache)
 					ConverterCache::get().add(orig_from,
@@ -443,12 +443,14 @@ bool Converters::convert(Buffer const * buffer,
 			int res;
 			if (dummy) {
 				res = one.startscript(Systemcall::DontWait,
-					to_filesystem8bit(from_utf8(command)));
+					to_filesystem8bit(from_utf8(command)),
+					buffer->filePath());
 				// We're not waiting for the result, so we can't do anything
 				// else here.
 			} else {
 				res = one.startscript(Systemcall::Wait,
-						to_filesystem8bit(from_utf8(command)));
+						to_filesystem8bit(from_utf8(command)),
+						buffer->filePath());
 				if (!real_outfile.empty()) {
 					Mover const & mover = getMover(conv.to);
 					if (!mover.rename(outfile, real_outfile))
@@ -468,7 +470,8 @@ bool Converters::convert(Buffer const * buffer,
 						" < " + quoteName(infile2 + ".out") +
 						" > " + quoteName(logfile);
 					one.startscript(Systemcall::Wait,
-						to_filesystem8bit(from_utf8(command2)));
+						to_filesystem8bit(from_utf8(command2)),
+						buffer->filePath());
 					if (!scanLog(*buffer, command, makeAbsPath(logfile, path), errorList))
 						return false;
 				}
@@ -612,7 +615,8 @@ bool Converters::runLaTeX(Buffer const & buffer, string const & command,
 
 	// do the LaTeX run(s)
 	string const name = buffer.latexName();
-	LaTeX latex(command, runparams, FileName(makeAbsPath(name)));
+	LaTeX latex(command, runparams, FileName(makeAbsPath(name)),
+		    buffer.filePath());
 	TeXErrors terr;
 	ShowMessage show(buffer);
 	latex.message.connect(show);

src/Format.cpp

@@ -285,7 +285,7 @@ bool Formats::view(Buffer const & buffer, FileName const & filename,
 	}
 	// viewer is 'auto'
 	if (format->viewer() == "auto") {
-		if (os::autoOpenFile(filename.absFileName(), os::VIEW))
+		if (os::autoOpenFile(filename.absFileName(), os::VIEW, buffer.filePath()))
 			return true;
 		else {
 			Alert::error(_("Cannot view file"),
@@ -320,7 +320,7 @@ bool Formats::view(Buffer const & buffer, FileName const & filename,
 	buffer.message(_("Executing command: ") + from_utf8(command));
 
 	Systemcall one;
-	one.startscript(Systemcall::DontWait, command);
+	one.startscript(Systemcall::DontWait, command, buffer.filePath());
 
 	// we can't report any sort of error, since we aren't waiting
 	return true;
@@ -364,7 +364,7 @@ bool Formats::edit(Buffer const & buffer, FileName const & filename,
 
 	// editor is 'auto'
 	if (format->editor() == "auto") {
-		if (os::autoOpenFile(filename.absFileName(), os::EDIT))
+		if (os::autoOpenFile(filename.absFileName(), os::EDIT, buffer.filePath()))
 			return true;
 		else {
 			Alert::error(_("Cannot edit file"),
@@ -387,7 +387,7 @@ bool Formats::edit(Buffer const & buffer, FileName const & filename,
 	buffer.message(_("Executing command: ") + from_utf8(command));
 
 	Systemcall one;
-	one.startscript(Systemcall::DontWait, command);
+	one.startscript(Systemcall::DontWait, command, buffer.filePath());
 
 	// we can't report any sort of error, since we aren't waiting
 	return true;

src/LaTeX.cpp

@@ -93,8 +93,8 @@ bool operator!=(AuxInfo const & a, AuxInfo const & o)
  */
 
 LaTeX::LaTeX(string const & latex, OutputParams const & rp,
-	     FileName const & f)
-	: cmd(latex), file(f), runparams(rp)
+	     FileName const & f, string const & p)
+	: cmd(latex), file(f), path(p), runparams(rp)
 {
 	num_errors = 0;
 	if (prefixIs(cmd, "pdf")) { // Do we use pdflatex ?
@@ -421,7 +421,7 @@ int LaTeX::startscript()
 		     + quoteName(onlyFileName(file.toFilesystemEncoding()))
 		     + " > " + os::nulldev();
 	Systemcall one;
-	return one.startscript(Systemcall::Wait, tmp);
+	return one.startscript(Systemcall::Wait, tmp, path);
 }
 
 
@@ -448,7 +448,7 @@ bool LaTeX::runMakeIndex(string const & f, OutputParams const & runparams,
 	tmp += quoteName(f);
 	tmp += params;
 	Systemcall one;
-	one.startscript(Systemcall::Wait, tmp);
+	one.startscript(Systemcall::Wait, tmp, path);
 	return true;
 }
 
@@ -464,7 +464,7 @@ bool LaTeX::runMakeIndexNomencl(FileName const & file,
 	tmp += " -o "
 		+ onlyFileName(changeExtension(file.toFilesystemEncoding(), nls));
 	Systemcall one;
-	one.startscript(Systemcall::Wait, tmp);
+	one.startscript(Systemcall::Wait, tmp, path);
 	return true;
 }
 
@@ -604,7 +604,7 @@ bool LaTeX::runBibTeX(vector<AuxInfo> const & bibtex_info,
 		tmp += quoteName(onlyFileName(removeExtension(
 				it->aux_file.absFileName())));
 		Systemcall one;
-		one.startscript(Systemcall::Wait, tmp);
+		one.startscript(Systemcall::Wait, tmp, path);
 	}
 	// Return whether bibtex was run
 	return result;

src/LaTeX.h

@@ -151,7 +151,8 @@ public:
 	   path = name of the files original path.
 	*/
 	LaTeX(std::string const & cmd, OutputParams const &,
-	      support::FileName const & file);
+	      support::FileName const & file,
+	      std::string const & path = empty_string());
 
 	/// runs LaTeX several times
 	int run(TeXErrors &);
@@ -210,6 +211,9 @@ private:
 	///
 	support::FileName file;
 
+	///
+	std::string path;
+
 	/// used by scanLogFile
 	int num_errors;
 

src/LyXRC.cpp

@@ -192,6 +192,7 @@ LexerKeyword lyxrcTags[] = {
 	{ "\\template_path", LyXRC::RC_TEMPLATEPATH },
 	{ "\\tex_allows_spaces", LyXRC::RC_TEX_ALLOWS_SPACES },
 	{ "\\tex_expects_windows_paths", LyXRC::RC_TEX_EXPECTS_WINDOWS_PATHS },
+	{ "\\texinputs_prefix", LyXRC::RC_TEXINPUTS_PREFIX },
 	{ "\\thesaurusdir_path", LyXRC::RC_THESAURUSDIRPATH },
 	{ "\\ui_file", LyXRC::RC_UIFILE },
 	{ "\\use_converter_cache", LyXRC::RC_USE_CONVERTER_CACHE },
@@ -227,6 +228,8 @@ void LyXRC::setDefaults()
 	bind_file = "cua";
 	def_file = "default";
 	ui_file = "default";
+	// The current document directory
+	texinputs_prefix = ".";
 	// Get printer from the environment. If fail, use default "",
 	// assuming that everything is set up correctly.
 	printer = getEnv("PRINTER");
@@ -499,6 +502,10 @@ LyXRC::ReturnValues LyXRC::read(Lexer & lexrc, bool check_format)
 			lexrc >> tex_allows_spaces;
 			break;
 
+		case RC_TEXINPUTS_PREFIX:
+			lexrc >> texinputs_prefix;
+			break;
+
 		case RC_KBMAP:
 			lexrc >> use_kbmap;
 			break;
@@ -2213,6 +2220,14 @@ void LyXRC::write(ostream & os, bool ignore_system_lyxrc, string const & name) c
 		   << "# TEX SECTION #######################################\n"
 		   << "#\n\n";
 
+	case RC_TEXINPUTS_PREFIX:
+		if (ignore_system_lyxrc ||
+		    texinputs_prefix != system_lyxrc.texinputs_prefix) {
+			os << "\\texinputs_prefix \"" << texinputs_prefix << "\"\n";
+		}
+		if (tag != RC_LAST)
+			break;
+
 	case RC_FONT_ENCODING:
 		if (ignore_system_lyxrc ||
 		    fontenc != system_lyxrc.fontenc) {
@@ -3020,6 +3035,10 @@ void actOnUpdatedPrefs(LyXRC const & lyxrc_orig, LyXRC const & lyxrc_new)
 		if (lyxrc_orig.windows_style_tex_paths != lyxrc_new.windows_style_tex_paths) {
 			os::windows_style_tex_paths(lyxrc_new.windows_style_tex_paths);
 		}
+	case LyXRC::RC_TEXINPUTS_PREFIX:
+		if (lyxrc_orig.texinputs_prefix != lyxrc_new.texinputs_prefix) {
+			lyxrc.texinputs_prefix = lyxrc_new.texinputs_prefix;
+		}
 	case LyXRC::RC_THESAURUSDIRPATH:
 	case LyXRC::RC_UIFILE:
 	case LyXRC::RC_USER_EMAIL:
@@ -3470,6 +3489,13 @@ string const LyXRC::getDescription(LyXRCTags tag)
 	case RC_TEX_EXPECTS_WINDOWS_PATHS:
 		break;
 
+	case RC_TEXINPUTS_PREFIX:
+		str = _("Specify those directories which should be "
+			 "prepended to the TEXINPUTS environment variable. "
+			 "A '.' represents the current document directory. "
+			 "Use the OS native format.");
+		break;
+
 	case RC_UIFILE:
 		str = _("The UI (user interface) file. Can either specify an absolute path, or LyX will look in its global and local ui/ directories.");
 		break;

src/LyXRC.h

@@ -174,6 +174,7 @@ public:
 		RC_TEMPLATEPATH,
 		RC_TEX_ALLOWS_SPACES,
 		RC_TEX_EXPECTS_WINDOWS_PATHS,
+		RC_TEXINPUTS_PREFIX,
 		RC_THESAURUSDIRPATH,
 		RC_UIFILE,
 		RC_USELASTFILEPOS,
@@ -469,6 +470,11 @@ public:
 	 *  The string is input, stored and output in native format.
 	 */
 	std::string path_prefix;
+	/** Prepend paths to the TEXINPUTS environment variable.
+	 *  The string is input, stored and output in native format.
+	 *  A '.' here stands for the current document directory.
+	 */
+	std::string texinputs_prefix;
 	/// Use the cache for file converters?
 	bool use_converter_cache;
 	/// The maximum age of cache files in seconds

src/VCBackend.cpp

@@ -43,7 +43,7 @@ int VCS::doVCCommandCall(string const & cmd, FileName const & path)
 	LYXERR(Debug::LYXVC, "doVCCommandCall: " << cmd);
 	Systemcall one;
 	support::PathChanger p(path);
-	return one.startscript(Systemcall::Wait, cmd, false);
+	return one.startscript(Systemcall::Wait, cmd, string(), false);
 }
 
 

src/frontends/qt4/GuiPrefs.cpp

@@ -1312,6 +1312,9 @@ PrefPaths::PrefPaths(GuiPreferences * form)
 
 	connect(pathPrefixED, SIGNAL(textChanged(QString)),
 		this, SIGNAL(changed()));
+
+	connect(texinputsPrefixED, SIGNAL(textChanged(QString)),
+		this, SIGNAL(changed()));
 }
 
 
@@ -1325,6 +1328,7 @@ void PrefPaths::apply(LyXRC & rc) const
 	rc.thesaurusdir_path = internal_path(fromqstr(thesaurusDirED->text()));
 	rc.hunspelldir_path = internal_path(fromqstr(hunspellDirED->text()));
 	rc.path_prefix = internal_path_list(fromqstr(pathPrefixED->text()));
+	rc.texinputs_prefix = internal_path_list(fromqstr(texinputsPrefixED->text()));
 	// FIXME: should be a checkbox only
 	rc.lyxpipes = internal_path(fromqstr(lyxserverDirED->text()));
 }
@@ -1340,6 +1344,7 @@ void PrefPaths::update(LyXRC const & rc)
 	thesaurusDirED->setText(toqstr(external_path(rc.thesaurusdir_path)));
 	hunspellDirED->setText(toqstr(external_path(rc.hunspelldir_path)));
 	pathPrefixED->setText(toqstr(external_path_list(rc.path_prefix)));
+	texinputsPrefixED->setText(toqstr(external_path_list(rc.texinputs_prefix)));
 	// FIXME: should be a checkbox only
 	lyxserverDirED->setText(toqstr(external_path(rc.lyxpipes)));
 }

src/frontends/qt4/ui/PrefPathsUi.ui

@@ -19,7 +19,7 @@
    <property name="spacing" >
     <number>6</number>
    </property>
-   <item row="11" column="0" colspan="3" >
+   <item row="12" column="0" colspan="3" >
     <spacer>
      <property name="orientation" >
       <enum>Qt::Vertical</enum>
@@ -46,7 +46,20 @@
     </widget>
    </item>
    <item row="10" column="1" colspan="2" >
-    <widget class="QLineEdit" name="pathPrefixED" />
+    <widget class="QLineEdit" name="pathPrefixED"/>
+   </item>
+   <item row="11" column="0">
+    <widget class="QLabel" name="texinputsPrefixLA">
+     <property name="text">
+      <string>TEX&amp;INPUTS prefix:</string>
+     </property>
+     <property name="buddy">
+      <cstring>texinputsPrefixED</cstring>
+     </property>
+    </widget>
+   </item>
+   <item row="11" column="1" colspan="2">
+    <widget class="QLineEdit" name="texinputsPrefixED"/>
    </item>
    <item row="6" column="2" >
     <widget class="QPushButton" name="thesaurusDirPB" >

src/support/Systemcall.cpp

@@ -14,6 +14,8 @@
 #include <config.h>
 
 #include "support/debug.h"
+#include "support/environment.h"
+#include "support/filetools.h"
 #include "support/lstrings.h"
 #include "support/qstring_helpers.h"
 #include "support/Systemcall.h"
@@ -21,6 +23,7 @@
 #include "support/os.h"
 #include "support/ProgressInterface.h"
 
+#include "LyXRC.h"
 
 #include <cstdlib>
 #include <iostream>
@@ -96,9 +99,26 @@ ProgressInterface* ProgressInterface::instance()
 // Reuse of instance
 #ifndef USE_QPROCESS
 int Systemcall::startscript(Starttype how, string const & what,
-							bool /*process_events*/)
+			    std::string const & path, bool /*process_events*/)
 {
-	string command = what;
+	string command;
+	string const texinputs = os::latex_path_list(
+			replaceCurdirPath(path, lyxrc.texinputs_prefix));
+	string const sep = string(1, os::path_separator(os::TEXENGINE));
+	string const env = getEnv("TEXINPUTS");
+
+	switch (os::shell()) {
+	case os::UNIX:
+		command = path.empty() || lyxrc.texinputs_prefix.empty() ? what
+			: "env TEXINPUTS='." + sep + texinputs
+					     + sep + env + "' " + what;
+		break;
+	case os::CMD_EXE:
+		command = path.empty() || lyxrc.texinputs_prefix.empty() ? what
+			: "set TEXINPUTS=." + sep + texinputs
+					    + sep + env + " & " + what;
+		break;
+	}
 
 	if (how == DontWait) {
 		switch (os::shell()) {
@@ -204,7 +224,8 @@ string const parsecmd(string const & inputcmd, string & outfile)
 
 
 
-int Systemcall::startscript(Starttype how, string const & what, bool process_events)
+int Systemcall::startscript(Starttype how, string const & what,
+			    string const & path, bool process_events)
 {
 	string outfile;
 	QString cmd = toqstr(parsecmd(what, outfile));
@@ -212,7 +233,7 @@ int Systemcall::startscript(Starttype how, string const & what, bool process_eve
 	SystemcallPrivate d(outfile);
 
 
-	d.startProcess(cmd);
+	d.startProcess(cmd, path);
 	if (!d.waitWhile(SystemcallPrivate::Starting, process_events, -1)) {
 		LYXERR0("Systemcall: '" << cmd << "' did not start!");
 		LYXERR0("error " << d.errorMessage());
@@ -264,10 +285,24 @@ SystemcallPrivate::SystemcallPrivate(const std::string& of) :
 
 
 
-void SystemcallPrivate::startProcess(const QString& cmd)
+void SystemcallPrivate::startProcess(QString const & cmd, string const & path)
 {
 	cmd_ = cmd;
 	if (process_) {
+		if (!path.empty() && !lyxrc.texinputs_prefix.empty()) {
+			QString const texinputs = toqstr(os::latex_path_list(
+				replaceCurdirPath(path, lyxrc.texinputs_prefix)));
+			QChar const sep = os::path_separator(os::TEXENGINE);
+			QString const prefix = QLatin1String("TEXINPUTS=.")
+						+ sep + texinputs + sep;
+			QStringList env = QProcess::systemEnvironment();
+			if (env.filter("TEXINPUTS=").isEmpty())
+				env << prefix;
+			else
+				env.replaceInStrings(QRegExp("^TEXINPUTS=(.*)"),
+						     prefix + "\\1");
+			process_->setEnvironment(env);
+		}
 		state = SystemcallPrivate::Starting;
 		process_->start(cmd_);
 	}

src/support/Systemcall.h

@@ -40,10 +40,13 @@ public:
 
 	/** Start child process.
 	 *  The string "what" contains a commandline with arguments separated
-	 *  by spaces. Unset "process_events" in case UI should be blocked while
-	 *  processing the external command.
+	 *  by spaces. The string "path" contains the path to be prepended to
+	 *  the TEXINPUTS environment variable. Unset "process_events" in
+	 *  case UI should be blocked while processing the external command.
 	 */
-	int startscript(Starttype how, std::string const & what, bool process_events = false);
+	int startscript(Starttype how, std::string const & what,
+			std::string const & path = empty_string(),
+			bool process_events = false);
 };
 
 } // namespace support

src/support/SystemcallPrivate.h

@@ -44,7 +44,7 @@ public:
 	State state;
 
 	bool waitWhile(State, bool processEvents, int timeout = -1);
-	void startProcess(const QString& cmd);
+	void startProcess(QString const & cmd, std::string const & path);
 	
 	int exitCode();
 

src/support/filetools.cpp

@@ -577,6 +577,42 @@ string const replaceEnvironmentPath(string const & path)
 }
 
 
+// Replace current directory in all elements of a path list with a given path.
+string const replaceCurdirPath(string const & path, string const & pathlist)
+{
+	string const oldpathlist = replaceEnvironmentPath(pathlist);
+	char const sep = os::path_separator();
+	string newpathlist;
+
+	for (size_t i = 0, k = 0; i != string::npos; k = i) {
+		i = oldpathlist.find(sep, i);
+		string p = oldpathlist.substr(k, i - k);
+		if (FileName::isAbsolute(p)) {
+			newpathlist += p;
+		} else if (i > k) {
+			size_t offset = 0;
+			if (p == ".") {
+				offset = 1;
+			} else if (prefixIs(p, "./")) {
+				offset = 2;
+				while (p[offset] == '/')
+					++offset;
+			}
+			newpathlist += addPath(path, p.substr(offset));
+			if (suffixIs(p, "//"))
+				newpathlist += '/';
+		}
+		if (i != string::npos) {
+			newpathlist += sep;
+			// Stop here if the last element is empty 
+			if (++i == oldpathlist.length())
+				break;
+		}
+	}
+	return newpathlist;
+}
+
+
 // Make relative path out of two absolute paths
 docstring const makeRelPath(docstring const & abspath, docstring const & basepath)
 // Makes relative path out of absolute path. If it is deeper than basepath,

src/support/filetools.h

@@ -247,6 +247,12 @@ std::string const onlyFileName(std::string const & fname);
 */
 std::string const replaceEnvironmentPath(std::string const & path);
 
+/** Replace all references to a current directory (a lonely '.' or
+    the prefix "./") in \c pathlist with \c path. Also prefixes
+    all non-absolute paths with \c path.
+*/
+std::string const replaceCurdirPath(std::string const & path, std::string const & pathlist);
+
 /** Set \c link to the path \c file points to as a symbolic link.
     \return true if successful.
  */

src/support/os.h

@@ -104,6 +104,12 @@ std::string internal_path_list(std::string const & p);
  */
 std::string latex_path(std::string const & p);
 
+/**
+ * Converts a platform style path list into a form suitable for the TeX engine.
+ * \p p is encoded in utf8.
+ */
+std::string latex_path_list(std::string const & p);
+
 /// Checks if the format string is suitable on the OS
 bool is_valid_strftime(std::string const & p);
 
@@ -112,10 +118,15 @@ bool is_valid_strftime(std::string const & p);
  */
 char const * popen_read_mode();
 
-/** The character used to separate paths returned by the
- *  PATH environment variable.
+enum path_type {
+	PLATFORM,
+	TEXENGINE
+};
+
+/** The character used to separate paths for platform environment variables
+ *  (such as PATH) or for the TeX engine.
  */
-char path_separator();
+char path_separator(path_type type = PLATFORM);
 
 /** If @c use_windows_paths is true, LyX will output Windows-style paths to
  *  latex files rather than posix ones. Obviously, this option is used only
@@ -133,14 +144,15 @@ enum auto_open_mode {
  *  \param mode can be opened in VIEW or EDIT mode
  *  \returns whether or not the format can be opened according to \p mode
  */
-bool canAutoOpenFile(std::string const & ext, auto_open_mode const mode = VIEW);
+bool canAutoOpenFile(std::string const & ext, auto_open_mode const mode);
 
 /** View or edit a file with the default viewer or editor.
  *  \param filename file to open (encoded in utf8)
  *  \param mode open in VIEW or EDIT mode
  *  \returns whether or not the file is viewed (or edited) successfully.
  */
-bool autoOpenFile(std::string const & filename, auto_open_mode const mode = VIEW);
+bool autoOpenFile(std::string const & filename, auto_open_mode const mode,
+		  std::string const & path = empty_string());
 
 /** Resolves a path such that it does not contain '.', '..', or symbolic links.
   * \p path and the return value are encoded in utf8.

src/support/os_cygwin.cpp

@@ -15,12 +15,16 @@
 
 #include <config.h>
 
+#include "LyXRC.h"
+
 #include "support/os.h"
 
+#include "support/debug.h"
+#include "support/environment.h"
 #include "support/FileName.h"
+#include "support/filetools.h"
 #include "support/lassert.h"
 #include "support/lstrings.h"
-#include "support/debug.h"
 
 #include <windows.h>
 #include <io.h>
@@ -343,6 +347,19 @@ string latex_path(string const & p)
 }
 
 
+string latex_path_list(string const & p)
+{
+	// We may need a posix style path or a windows style path (depending
+	// on windows_style_tex_paths_), but we use always forward slashes,
+	// since this is standard for all tex engines.
+
+	if (windows_style_tex_paths_)
+		return convert_path_list(p, PathStyle(windows));
+
+	return convert_path_list(p, PathStyle(posix));
+}
+
+
 bool is_valid_strftime(string const & p)
 {
 	string::size_type pos = p.find_first_of('%');
@@ -387,8 +404,11 @@ int timeout_min()
 }
 
 
-char path_separator()
+char path_separator(path_type type)
 {
+	if (type == TEXENGINE)
+		return windows_style_tex_paths_ ? ';' : ':';
+
 	return ':';
 }
 
@@ -415,13 +435,30 @@ bool canAutoOpenFile(string const & ext, auto_open_mode const mode)
 }
 
 
-bool autoOpenFile(string const & filename, auto_open_mode const mode)
+bool autoOpenFile(string const & filename, auto_open_mode const mode,
+		  string const & path)
 {
+	string const texinputs = os::latex_path_list(
+			replaceCurdirPath(path, lyxrc.texinputs_prefix));
+	string const sep = windows_style_tex_paths_ ? ";" : ":";
+	string const oldval = getEnv("TEXINPUTS");
+	string const newval = "." + sep + texinputs + sep + oldval;
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty()) {
+		setEnv("TEXINPUTS", newval);
+		cygwin_internal(CW_SYNC_WINENV);
+	}
+
 	// reference: http://msdn.microsoft.com/en-us/library/bb762153.aspx
 	string const win_path = to_local8bit(from_utf8(convert_path(filename, PathStyle(windows))));
 	char const * action = (mode == VIEW) ? "open" : "edit";
-	return reinterpret_cast<int>(ShellExecute(NULL, action,
-		win_path.c_str(), NULL, NULL, 1)) > 32;
+	bool success = reinterpret_cast<int>(ShellExecute(NULL, action,
+					win_path.c_str(), NULL, NULL, 1)) > 32;
+
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty()) {
+		setEnv("TEXINPUTS", oldval);
+		cygwin_internal(CW_SYNC_WINENV);
+	}
+	return success;
 }
 
 

src/support/os_unix.cpp

@@ -12,9 +12,13 @@
 
 #include <config.h>
 
+#include "LyXRC.h"
+
 #include "support/os.h"
 #include "support/docstring.h"
+#include "support/environment.h"
 #include "support/FileName.h"
+#include "support/filetools.h"
 #include "support/lstrings.h"
 #include "support/lassert.h"
 
@@ -176,6 +180,12 @@ string latex_path(string const & p)
 }
 
 
+string latex_path_list(string const & p)
+{
+	return p;
+}
+
+
 bool is_valid_strftime(string const & p)
 {
 	string::size_type pos = p.find_first_of('%');
@@ -218,7 +228,7 @@ int timeout_min()
 }
 
 
-char path_separator()
+char path_separator(path_type)
 {
 	return ':';
 }
@@ -258,7 +268,8 @@ bool canAutoOpenFile(string const & ext, auto_open_mode const mode)
 }
 
 
-bool autoOpenFile(string const & filename, auto_open_mode const mode)
+bool autoOpenFile(string const & filename, auto_open_mode const mode,
+		  string const & path)
 {
 #ifdef __APPLE__
 // Reference: http://developer.apple.com/documentation/Carbon/Reference/LaunchServicesReference/
@@ -279,6 +290,13 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode)
 	if (status == kLSApplicationNotFoundErr)
 		return false;
 
+	string const texinputs = os::latex_path_list(
+			replaceCurdirPath(path, lyxrc.texinputs_prefix));
+	string const oldval = getEnv("TEXINPUTS");
+	string const newval = ".:" + texinputs + ":" + oldval;
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty())
+		setEnv("TEXINPUTS", newval);
+
 	LSLaunchFSRefSpec inLaunchSpec;
 	inLaunchSpec.appRef = &outAppRef;
 	inLaunchSpec.numDocs = 1;
@@ -288,11 +306,15 @@ bool autoOpenFile(string const & filename, auto_open_mode const mode)
 	inLaunchSpec.asyncRefCon = NULL;
 	status = LSOpenFromRefSpec(&inLaunchSpec, NULL);
 
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty())
+		setEnv("TEXINPUTS", oldval);
+
 	return status != kLSApplicationNotFoundErr;
 #else
 	// silence compiler warnings
 	(void)filename;
 	(void)mode;
+	(void)path;
 
 	// currently, no default viewer is tried for non-windows system
 	// support for KDE/Gnome/Macintosh may be added later

src/support/os_win32.cpp

@@ -15,10 +15,13 @@
 
 #include <config.h>
 
+#include "LyXRC.h"
+
 #include "support/os.h"
 #include "support/os_win32.h"
 
 #include "support/debug.h"
+#include "support/environment.h"
 #include "support/FileName.h"
 #include "support/gettext.h"
 #include "support/filetools.h"
@@ -385,6 +388,38 @@ string latex_path(string const & p)
 }
 
 
+string latex_path_list(string const & p)
+{
+	if (p.empty())
+		return p;
+
+	// We may need a posix style path or a windows style path (depending
+	// on windows_style_tex_paths_), but we use always forward slashes,
+	// since this is standard for all tex engines.
+
+	if (!windows_style_tex_paths_) {
+		string pathlist;
+		for (size_t i = 0, k = 0; i != string::npos; k = i) {
+			i = p.find(';', i);
+			string path = subst(p.substr(k, i - k), '\\', '/');
+			if (FileName::isAbsolute(path)) {
+				string const drive = path.substr(0, 2);
+				string const cygprefix = cygdrive + "/"
+							+ drive.substr(0, 1);
+				path = subst(path, drive, cygprefix);
+			}
+			pathlist += path;
+			if (i != string::npos) {
+				pathlist += ':';
+				++i;
+			}
+		}
+		return pathlist;
+	}
+	return subst(p, '\\', '/');
+}
+
+
 bool is_valid_strftime(string const & p)
 {
 	string::size_type pos = p.find_first_of('%');
@@ -429,8 +464,11 @@ int timeout_min()
 }
 
 
-char path_separator()
+char path_separator(path_type type)
 {
+	if (type == TEXENGINE)
+		return windows_style_tex_paths_ ? ';' : ':';
+
 	return ';';
 }
 
@@ -507,12 +545,25 @@ bool canAutoOpenFile(string const & ext, auto_open_mode const mode)
 }
 
 
-bool autoOpenFile(string const & filename, auto_open_mode const mode)
+bool autoOpenFile(string const & filename, auto_open_mode const mode,
+		  string const & path)
 {
+	string const texinputs = os::latex_path_list(
+			replaceCurdirPath(path, lyxrc.texinputs_prefix));
+	string const sep = windows_style_tex_paths_ ? ";" : ":";
+	string const oldval = getEnv("TEXINPUTS");
+	string const newval = "." + sep + texinputs + sep + oldval;
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty())
+		setEnv("TEXINPUTS", newval);
+
 	// reference: http://msdn.microsoft.com/en-us/library/bb762153.aspx
 	char const * action = (mode == VIEW) ? "open" : "edit";
-	return reinterpret_cast<int>(ShellExecute(NULL, action,
+	bool success = reinterpret_cast<int>(ShellExecute(NULL, action,
 		to_local8bit(from_utf8(filename)).c_str(), NULL, NULL, 1)) > 32;
+
+	if (!path.empty() && !lyxrc.texinputs_prefix.empty())
+		setEnv("TEXINPUTS", oldval);
+	return success;
 }