We no longer have two doc systems, move sphinx_doc_src back to doc_src

doc_src/cmds/string-length.rst

@@ -0,0 +1,39 @@
+string-length - print string lengths
+====================================
+
+Synopsis
+--------
+
+.. BEGIN SYNOPSIS
+
+::
+
+    string length [(-q | --quiet)] [STRING...]
+
+.. END SYNOPSIS
+
+Description
+-----------
+
+.. BEGIN DESCRIPTION
+
+``string length`` reports the length of each string argument in characters. Exit status: 0 if at least one non-empty STRING was given, or 1 otherwise.
+
+.. END DESCRIPTION
+
+Examples
+--------
+
+.. BEGIN EXAMPLES
+
+::
+
+    >_ string length 'hello, world'
+    12
+
+    >_ set str foo
+    >_ string length -q $str; echo $status
+    0
+    # Equivalent to test -n $str
+
+.. END EXAMPLES