let filter 'which' find a command in a specified subdir of PATH elements

src/filters/rclexecm.py

@@ -226,6 +226,14 @@ class RclExecM:
 
 
 # Helper routine to test for program accessibility
+# Note that this works a bit differently from Linux 'which', which
+# won't search the PATH if there is a path part in the program name,
+# even if not absolute (e.g. will just try subdir/cmd in current
+# dir). We will find such a command if it exists in a matching subpath
+# of any PATH element.
+# This is very useful esp. on Windows so that we can have several bin
+# filter directories under filters (to avoid dll clashes). The
+# corresponding c++ routine in recoll execcmd works the same.
 def which(program):
     def is_exe(fpath):
         return os.path.exists(fpath) and os.access(fpath, os.X_OK)
@@ -242,9 +250,8 @@ def which(program):
                 yield path
         for path in os.environ["PATH"].split(os.pathsep):
             yield path
-            
-    fpath, fname = os.path.split(program)
-    if fpath:
+
+    if os.path.isabs(program):
         if is_exe(program):
             return program
     else:
@@ -296,7 +303,9 @@ def main(proto, extract):
     # Not running the main loop: either acting as single filter (when called
     # from other filter for example), or debugging
     def usage():
-        print("Usage: rclexecm.py [-d] [-s] [-i ipath] [filename]",
+        print("Usage: rclexecm.py [-d] [-s] [-i ipath] <filename>",
+              file=sys.stderr)
+        print("       rclexecm.py -w <prog>",
               file=sys.stderr)
         sys.exit(1)
         
@@ -305,7 +314,7 @@ def main(proto, extract):
     ipath = ""
 
     args = sys.argv[1:]
-    opts, args = getopt.getopt(args, "hdsi:")
+    opts, args = getopt.getopt(args, "hdsi:w:")
     for opt, arg in opts:
         if opt in ['-h']:
             usage()
@@ -313,6 +322,13 @@ def main(proto, extract):
             actAsSingle = True
         elif opt in ['-i']:
             ipath = arg
+        elif opt in ['-w']:
+            ret = which(arg)
+            if ret:
+                print("%s" % ret)
+                sys.exit(0)
+            else:
+                sys.exit(1)
         elif opt in ['-d']:
             debugDumpData = True
         else:

website/pages/recoll-mingw.txt

@@ -15,6 +15,12 @@ In the following, a number of commands will use a command window with an
 MinGW environment. This can be easily created by executing
 C:\MinGW\msys\1.0\msys.bat from File Explorer.
 
+Note: you should take care to use the gcc compiler which comes with Qt for
+all the following builds. For this, you will want to execute the following
+command in the command window:
+
+    export PATH=c:/qt/tools/mingw492_32/bin:$PATH
+
 == Tortoise HG
 
 This is needed because there is no source package for recoll or its
@@ -30,15 +36,26 @@ dependancies] to C:/recolldeps
 You can change the target names, but there will be more script editing
 later on then (nothing much).
 
+== Qt
+
+Download and install Qt 5.5.x (mingw version) from: http://www.qt.io/download/
+
+Note: it is not possible to build a static webkit, so the installation is
+necessarily dynamic, which means that the Qt DLLS will need to be copied
+into the installation directory. This is done by the installation-building
+script (using `windeployqt`)
+
+
 == zlib
 
 Download from http://zlib.net/zlib-1.2.8.tar.gz
 Then, from an MSYS command window (see above):
 
      cd c:/temp
+     export PATH=c:/qt/tools/mingw492_32/bin:$PATH
      tar xzf path-to-tar-file
      cd zlib-1.2.8
-     make -f Win32/Makefile.gcc
+     make -f win32/Makefile.gcc
 
 == Xapian
 
@@ -56,18 +73,10 @@ http://oligarchy.co.uk/xapian/1.2.21/xapian-core-1.2.21.tar.xz
 
 Then: 
 
+    export PATH=c:/qt/tools/mingw492_32/bin:$PATH
     CPPFLAGS=-IC:/temp/zlib-1.2.8 LDFLAGS=-Lc:/temp/zlib-1.2.8 ./configure
     make
 
-== Qt
-
-Download and install Qt 5.5.x (mingw version) from: http://www.qt.io/download/
-
-Note: it is not possible to build a static webkit, so the installation is
-necessarily dynamic, which means that the Qt DLLS will need to be copied
-into the installation directory. This is done by the installation-building
-script (using `windeployqt`)
-
 == Recoll
 
 You need to use the source from the repository, there is no release