MDEV-40551 Copy/Paste friendly output format for MariaDB Command Line Client

Copy/paste friendly output was only reachable by starting the client with
--silent --skip-column-names, which cannot be done from a running
interactive session.

Add \S, a statement terminator which prints the result of one statement in
the tab separated format without column names.

com_silent() sets output_plain, opt_silent and column_names around
com_go(), then restores them, the same way com_ego() handles vertical.
output_plain selects print_tab_data() ahead of the vertical and table
branches, so \S gives the same output whether the session was started
plainly or with --table, --vertical or --silent. --html and --xml still
win, matching \G.

Author: KhaledR57

client/mysql.cc

@@ -243,6 +243,7 @@ enum ss_comment_type { SSC_NONE= 0, SSC_CONDITIONAL, SSC_HINT };
 static MYSQL mysql;			/* The connection */
 static my_bool ignore_errors=0,wait_flag=0,quick=0,
                connected=0,opt_raw_data=0,unbuffered=0,output_tables=0,
+               output_plain=0,
 	       opt_rehash=1,skip_updates=0,safe_updates=0,one_database=0,
 	       opt_compress=0, using_opt_local_infile=0,
 	       vertical=0, line_numbers=1, column_names=1,opt_html=0,
@@ -324,7 +325,7 @@ extern "C" my_bool get_one_option(int optid, const struct my_option *opt,
                                   const char *argument);
 static int com_quit(String *str,char*),
 	   com_go(String *str,char*), com_ego(String *str,char*),
-	   com_print(String *str,char*),
+	   com_silent(String *str,char*), com_print(String *str,char*),
 	   com_help(String *str,char*), com_clear(String *str,char*),
 	   com_connect(String *str,char*), com_status(String *str,char*),
 	   com_use(String *str,char*), com_source(String *str, char*),
@@ -414,6 +415,8 @@ static COMMANDS commands[] = {
   { "rehash", '#', com_rehash, 0, "Rebuild completion hash." },
   { "sandbox", '-', com_sandbox, 0,
     "Disallow commands that access the file system (except \\P without an argument and \\e)." },
+  { "silent", 'S', com_silent, 0,
+    "Send command to MariaDB server, display result without column names or borders."},
   { "source", '.', com_source, 1,
     "Execute an SQL script file. Takes a file name as an argument."},
   { "status", 's', com_status, 0, "Get status information from the server."},
@@ -3739,6 +3742,8 @@ static int com_go(String *buffer, char *)
 	  print_table_data_html(result);
 	else if (opt_xml)
 	  print_table_data_xml(result);
+	else if (output_plain)
+	  print_tab_data(result);
         else if (vertical || (auto_vertical_output &&
                 (terminal_width < get_result_width(result))))
 	  print_table_data_vertically(result);
@@ -3879,6 +3884,24 @@ com_ego(String *buffer,char *line)
 }
 
 
+static int
+com_silent(String *buffer,char *line)
+{
+  int result;
+  uint old_opt_silent=opt_silent;
+  bool old_output_plain=output_plain;
+  bool old_column_names=column_names;
+  opt_silent=1;
+  output_plain=1;
+  column_names=0;
+  result=com_go(buffer,line);
+  opt_silent=old_opt_silent;
+  output_plain=old_output_plain;
+  column_names=old_column_names;
+  return result;
+}
+
+
 static const char *fieldtype2str(enum enum_field_types type)
 {
   switch (type) {

mysql-test/main/mysql.result

@@ -55,6 +55,41 @@ _
 Test  'go' command g
 a
 1
+_
+Test 'silent' command(no column names) S
+a	b
+1	x
+1	x
+_
+Test 'silent' command(overrides --table) S
+1	x
+_
+Test 'silent' command(overrides --vertical) S
+1	x
+_
+Test 'silent' command(already silent) S
+1	x
+_
+Test 'silent' command(next statement unaffected) S
+1
++---+
+| a |
++---+
+| 1 |
++---+
+1
+*************************** 1. row ***************************
+a: 1
+_
+Test 'silent' command(G unaffected) S
+1
+*************************** 1. row ***************************
+a: 1
+_
+Test 'silent' command(statement with a quoted delimiter) S
+analyze table t1;
+_
+Test 'silent' command(empty result and error) S
 drop table t1;
 create table t1(a int);
 lock tables t1 write;

mysql-test/main/mysql.test

@@ -30,6 +30,35 @@ select "Test 'go' command(vertical output) \G" as "_";
 # Test 'go' command \g
 select "Test  'go' command \g" as "_";
 --exec $MYSQL test -e "select * from t1\g"
+#
+# MDEV-40551 Copy/Paste friendly output format for MariaDB Command Line Client
+#
+# Test 'silent' command \S
+select "Test 'silent' command(no column names) \S" as "_";
+--exec $MYSQL test -e "select 1 as a, 'x' as b;"
+--exec $MYSQL test -e "select 1 as a, 'x' as b\S"
+# \S overrides the session output format, whatever it was started with
+select "Test 'silent' command(overrides --table) \S" as "_";
+--exec $MYSQL test --table -e "select 1 as a, 'x' as b\S"
+select "Test 'silent' command(overrides --vertical) \S" as "_";
+--exec $MYSQL test --vertical -e "select 1 as a, 'x' as b\S"
+select "Test 'silent' command(already silent) \S" as "_";
+--exec $MYSQL test -s -s -e "select 1 as a, 'x' as b\S"
+# \S applies to its own statement only
+select "Test 'silent' command(next statement unaffected) \S" as "_";
+--exec $MYSQL test --table -e "select 1 as a\S select 1 as a;"
+--exec $MYSQL test --vertical -e "select 1 as a\S select 1 as a;"
+# \G after \S is still vertical
+select "Test 'silent' command(\G unaffected) \S" as "_";
+--exec $MYSQL test --table -e "select 1 as a\S select 1 as a\G"
+# The statement from the feature request
+select "Test 'silent' command(statement with a quoted delimiter) \S" as "_";
+--exec $MYSQL test --table -e "select concat('analyze table ', table_name, ';') from information_schema.tables where table_schema='test'\S"
+# \S on a statement that returns no rows, and on one that fails
+select "Test 'silent' command(empty result and error) \S" as "_";
+--exec $MYSQL test --table -e "select 1 as a from t1 where 1=0\S"
+--error 1
+--exec $MYSQL test --table -e "select nosuchcolumn from t1\S"
 --enable_query_log
 drop table t1;