csvm: Permit all whitespace (including tabs)

While tabs aren't desirable, users that are not developers will be modifying
these files, and so we need to be permissive in what we want to
accept.  That doesn't mean that we need to forego occasional formatting, though.

build-aux/csvm-expand

@@ -162,7 +162,7 @@ function parseline( i, m, j, me, orig )
 
 BEGIN {
   # we're parsing CSVs
-  FS = " *, *"
+  FS = "[[:space:]]*,[[:space:]]*"
   OFS = ","
 
   has_directives = 0

build-aux/test/test-csvm2csv

@@ -120,6 +120,22 @@ $bar_baz-quux,$foo'
   run-test "$input" "$expected"
 }
 
+# same as above but with whitespace
+test-whitespace-including-tabs-ok()
+{
+  declare -r input='header, line
+:foo=1
+:bar_baz-quux=2
+$foo, 1
+$bar_baz-quux,	$foo'
+
+  declare -r expected='header,line
+1,1
+2,1'
+
+  run-test "$input" "$expected"
+}
+
 
 test-range-delim()
 {
@@ -305,6 +321,7 @@ test-comment \
   && test-var-zero-ref \
   && test-directive-stripped \
   && test-no-sort \
+  && test-whitespace-including-tabs-ok \
   && test-fail-multi-directive \
   && test-fail-unknown-var-ref \
   && test-fail-non-numeric-range \
@@ -315,7 +332,7 @@ test-comment \
   }
 
 # safety check
-test "$testsum" -eq 15 || {
+test "$testsum" -eq 16 || {
   echo 'error: did not run all csvm2csv tests!' >&2
   exit 1
 }