avoid exceptions when the user's config points to nonexistent directories

Makefile

@@ -1,6 +1,12 @@
 
 TARGET := gvim-wrapper
-CFLAGS := -mno-cygwin -std=gnu99 -mwindows
-LDFLAGS := -mno-cygwin -mwindows
+CFLAGS := -std=gnu99 -mwindows
+LDFLAGS := -mwindows -static-libgcc -static-libstdc++
+INSTALL_DIR ?= /c/apps/bin
+CXX := i686-pc-mingw32-g++
 
 all: $(TARGET)
+
+install: $(TARGET)
+	cp $(TARGET) $(INSTALL_DIR)
+	cp $(TARGET).py $(INSTALL_DIR)

gvim-wrapper.c

@@ -1,20 +0,0 @@
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <string.h>
-
-int main(int argc, char *argv[])
-{
-    char **new_argv = malloc(sizeof(char *) * (argc + 2));
-    int i = 0;
-    new_argv[i++] = "gvim";
-    new_argv[i++] = "--remote-tab-silent";
-    for (int n = 1; n < argc; n++, i++)
-    {
-        new_argv[i] = malloc(strlen(argv[n]) + 3);
-        sprintf(new_argv[i], "\"%s\"", argv[n]);
-    }
-    new_argv[i++] = NULL;
-    execv("C:\\apps\\Vim\\vim73\\gvim.exe", (const char * const *) new_argv);
-    return -1;
-}

gvim-wrapper.cc

@@ -0,0 +1,23 @@
+#include <unistd.h>
+#include <string.h>
+#include <string>
+
+using namespace std;
+
+int main(int argc, char *argv[])
+{
+    string program_name = argv[0];
+    size_t pos = program_name.find_last_of("/\\");
+    string script_path =
+        (pos != string::npos)
+            ? program_name.substr(0, pos) + "/gvim-wrapper.py"
+            : "gvim-wrapper.py";
+    char **new_argv = new char *[argc + 2];
+    memcpy(&new_argv[2], &argv[1], argc * sizeof(new_argv[0]));
+    new_argv[0] = (char *)"pythonw.exe";
+    new_argv[1] = (char *)script_path.c_str();
+    new_argv[argc + 1] = NULL;
+    argv[0] = (char *)"gvim-wrapper.py";
+    execvp("pythonw.exe", new_argv);
+    return -1;
+}

gvim-wrapper.py

@@ -0,0 +1,71 @@
+import os
+import sys
+
+if os.path.exists('C:\\apps\\Vim\\vim74\\gvim.exe'):
+    vimdir = 'C:\\apps\\Vim\\vim74'
+elif os.path.exists('C:\\apps\\Vim\\vim73\\gvim.exe'):
+    vimdir = 'C:\\apps\\Vim\\vim73'
+else:
+    raise "Could not find Vim directory, update script"
+
+config = {
+    # path to directory containing vim.exe and gvim.exe
+    'vimdir': vimdir,
+    # list of (path, name) tuples defining gvim contexts
+    'servers': [],
+    # default server name to use if no server paths match
+    'default_server': 'GVIM',
+    }
+
+def read_config_file(config, path):
+    if os.path.exists(path):
+        fh = open(path, 'r')
+        script = fh.read()
+        fh.close()
+        try:
+            exec(script, config)
+        except:
+            sys.stderr.write('Configuration file error in "%s":\n' % path)
+            traceback.print_exception(sys.exc_info()[0], sys.exc_info()[1],
+                    None)
+            tb = traceback.extract_tb(sys.exc_info()[2])
+            for ent in tb[1:]:
+                lineno, fn = ent[1:3]
+                sys.stderr.write('  File "%s", line %d, in %s\n'
+                        % (path, lineno, fn))
+
+def path_contains_file(path, fname):
+    path = path.replace('\\', '/')
+    fname = fname.replace('\\', '/')
+    if path.endswith('/'):
+        path = path[:-1]
+    return fname.startswith(path + '/')
+
+def get_server_name(config, fname):
+    for path, name in config['servers']:
+        path = path.replace('\\', '/')
+        if path.endswith('/*'):
+            path = path[:-2]
+            try:
+                for dirent in os.listdir(path):
+                    query_path = os.path.join(path, dirent)
+                    if os.path.isdir(query_path) and path_contains_file(query_path, fname):
+                        return name.replace('*', dirent)
+            except:
+                pass
+        else:
+            if path_contains_file(path, fname):
+                return name.replace('*', os.path.basename(path))
+    return config['default_server']
+
+def main(argv):
+    read_config_file(config, os.path.expanduser('~/.gvim-wrapper'))
+    fname = ' '.join(argv[1:]) if len(argv) >= 2 else ''
+    servername = get_server_name(config, fname if fname != '' else os.getcwd() + '/dum')
+    cmd = ['gvim', '--servername', '"%s"' % servername]
+    if fname != '':
+        cmd += ['--remote-tab-silent', '"%s"' % fname]
+    os.execv(config['vimdir'] + '\\gvim.exe', cmd)
+
+if __name__ == '__main__':
+    sys.exit(main(sys.argv))