Tmain: list common fields when NONE is passed to --list-fields

Signed-off-by: Masatake YAMATO <[email protected]>

Author: masatake

Tmain/list-fields-none.d/exit-expected.txt

@@ -0,0 +1 @@
+0

Tmain/list-fields-none.d/run.sh

@@ -0,0 +1,6 @@
+# Copyright: 2022 Masatake YAMATO
+# License: GPL-2
+
+CTAGS=$1
+
+$CTAGS --quiet --options=NONE --list-fields=NONE | grep -v xpath

Tmain/list-fields-none.d/stderr-expected.txt

@@ -0,0 +1,25 @@
+#LETTER NAME           ENABLED LANGUAGE JSTYPE FIXED OP DESCRIPTION
+N       name           yes     NONE     s--    yes   rw tag name
+F       input          yes     NONE     s--    yes   r- input file
+P       pattern        yes     NONE     s-b    yes   -- pattern
+C       compact        no      NONE     s--    no    -- compact input line (used only in xref output)
+E       extras         no      NONE     s--    no    r- Extra tag type information
+K       NONE           no      NONE     s--    no    -- Kind of tag in long-name form
+R       NONE           no      NONE     s--    no    -- Marker (R or D) representing whether tag is definition or reference
+S       signature      no      NONE     s--    no    rw Signature of routine (e.g. prototype or parameter list)
+T       epoch          yes     NONE     -i-    no    -- the last modified time of the input file (only for F/file kind tag)
+Z       scope          no      NONE     s--    no    rw [tags output] prepend "scope:" key to s/scope field output, [xref and json output] the same as s/ field
+a       access         no      NONE     s--    no    rw Access (or export) of class members
+e       end            no      NONE     -i-    no    rw end lines of various items
+f       file           yes     NONE     --b    no    -- File-restricted scoping
+i       inherits       no      NONE     s-b    no    -w Inheritance information
+k       NONE           yes     NONE     s--    no    -- Kind of tag in one-letter form
+l       language       no      NONE     s--    no    -- Language of input file containing tag
+m       implementation no      NONE     s--    no    -- Implementation information
+n       line           no      NONE     -i-    no    rw Line number of tag definition
+o       nth            no      NONE     -i-    no    -- the order in the parent scope
+p       scopeKind      no      NONE     s--    no    -- [tags output] no effect, [xref and json output] kind of scope in long-name form
+r       roles          no      NONE     s--    no    r- Roles
+s       NONE           yes     NONE     s--    no    -- [tags output] scope (kind:name) of tag definition, [xref and json output] name of scope
+t       typeref        yes     NONE     s--    no    rw Type and name of a variable or typedef
+z       kind           no      NONE     s--    no    r- [tags output] prepend "kind:" to k/ (or K/) field output, [xref and json output] kind in long-name form

Tmain/list-fields-none.d/stdout-expected.txt

@@ -1047,9 +1047,11 @@ Listing Options
 ``--list-features``
 	Lists the compiled features.
 
-``--list-fields[=(<language>|all)]``
+``--list-fields[=(<language>|NONE|all)]``
 	Lists the fields recognized for either the specified *<language>* or
-	``all`` languages. See "`Extension fields`_" subsection to know what are fields.
+	``all`` languages. If ``NONE`` is specified, it lists only fields
+	common in all languages.
+	See "`Extension fields`_" subsection to know what are fields.
 	``all`` is used as default value if the option argument is omitted.
 
 	The meaning of columns are as follows:

docs/man/ctags.1.rst

@@ -1580,6 +1580,8 @@ static void processListFieldsOption(const char *const option CTAGS_ATTR_UNUSED,
 				fieldColprintAddLanguageLines (table, i);
 		}
 	}
+	else if (strcasecmp (parameter, RSV_NONE) == 0)
+		fieldColprintAddCommonLines (table);
 	else
 	{
 		langType language = getNamedLanguage (parameter, 0);

main/options.c

@@ -1047,9 +1047,11 @@ Listing Options
 ``--list-features``
 	Lists the compiled features.
 
-``--list-fields[=(<language>|all)]``
+``--list-fields[=(<language>|NONE|all)]``
 	Lists the fields recognized for either the specified *<language>* or
-	``all`` languages. See "`Extension fields`_" subsection to know what are fields.
+	``all`` languages. If ``NONE`` is specified, it lists only fields
+	common in all languages.
+	See "`Extension fields`_" subsection to know what are fields.
 	``all`` is used as default value if the option argument is omitted.
 
 	The meaning of columns are as follows: