python/grass/script: split the command string using shell-like syntax…

… on the win32 platform same as on POSIX-compliant platforms (#1908)

e.g. run 'd.vect map=census where="cat > 10 AND cat < 20"' with
where parameter from Command Prompt CMD/emulator terminal:

non-POSIX platform

```
>>> import shlex
>>> shlex.split('where="cat > 10 AND cat < 20"', posix=False)
['where="cat', '>', '10', 'AND', 'cat', '<', '20"']
```

POSIX-compliant platform

```
>>> import shlex
>>> shlex.split('where="cat > 10 AND cat < 20"', posix=True)
['where=cat > 10 AND cat < 20']
```

Under OS MS Windows 'd.vect map=census where="cat > 10 AND cat < 20"'
command runned from Command Prompt CMD require use ^ carret symbol for
escaping special characters < > ( ) & | , ; ".

e.g. 'd.vect map=census where="cat ^> 10 AND cat ^< 20"'

---------

Co-authored-by: Anna Petrasova <[email protected]>

display/d.vect/d.vect.html

@@ -10,6 +10,13 @@ <h2>NOTES</h2>
 which allow the user to specify vector type, colors, data fields, SQL
 queries, label size and justification, etc.
 
+<p>When <em>d.vect</em> is used with <b>where</b> parameter on MS Windows
+Command Prompt, it is important to use <tt>&#710;</tt>
+carret symbol for escaping special characters <tt>&lt; &gt; ( ) &amp; &#124; , ; &quot;</tt>.
+<div class="code"><pre>
+d.vect map=vector_map where="cat &#710;&gt; 10 AND cat &#710;&lt; 20"
+</pre></div>
+
 <p>By default <em>d.vect</em> areas are filled with <b>fill_color</b> and
 outlined with <b>color</b>. Area outlines can be suppressed with
 <div class="code"><pre>

python/grass/script/utils.py

@@ -326,13 +326,27 @@ def get_num_suffix(number, max_number):
 
 
 def split(s):
-    """!Platform specific shlex.split"""
-    if sys.version_info >= (2, 6):
-        return shlex.split(s, posix=(sys.platform != "win32"))
-    elif sys.platform == "win32":
-        return shlex.split(s.replace("\\", r"\\"))
-    else:
-        return shlex.split(s)
+    """Same shlex.split() func on all OS platforms
+
+    We don't use parameter posix=True on the OS MS Windows due to incorrectly
+    splitting command line parameters:
+
+    e.g. d.vect where="cat < 10"
+
+    is split incorrectly as follows:
+
+    'where="cat', '<', '10"'
+
+    Should be:
+
+    'where=cat < 10'
+
+
+    :param str s: cmd string
+
+    return list: cmd list
+    """
+    return shlex.split(s)
 
 
 # source: