virsh: Treat \n like ; in batch mode

I wanted to do a demonstration with virsh batch mode, which
takes multiple commands all packed into a single argument:

$ virsh -c test:///default 'echo a; echo b;'
a
b

but that produced a really long line, so I tried to make it
more legible:

$ virsh -c test:///default '
   echo a;
   echo b;
'
error: unknown command: '
'

Let's be more like the shell, and treat unquoted newline as a
command separator just as we do for semicolon.  In fact, with
that, I can even now mix styles:

$ virsh -c test:///default '
   echo a; echo b
   echo c
'
a
b
c
Signed-off-by: NEric Blake <eblake@redhat.com>
Reviewed-by: NJohn Ferlan <jferlan@redhat.com>

tests/virshtest.c

@@ -411,6 +411,10 @@ mymain(void)
     DO_TEST(34, "hello\n", "echo --str hello");
     DO_TEST(35, "hello\n", "echo --hi");
 
+    /* Tests of multiple commands.  */
+    DO_TEST(36, "a\nb\n", " echo a; echo b;");
+    DO_TEST(37, "a\nb\n", "\necho a\n echo b\n");
+
 # undef DO_TEST
 
     VIR_FREE(custom_uri);

tools/virsh.pod

@@ -40,8 +40,8 @@ as a name.
 The B<virsh> program can be used either to run one I<COMMAND> by giving the
 command and its arguments on the shell command line, or a I<COMMAND_STRING>
 which is a single shell argument consisting of multiple I<COMMAND> actions
-and their arguments joined with whitespace, and separated by semicolons
-between commands.  Within I<COMMAND_STRING>, virsh understands the
+and their arguments joined with whitespace and separated by semicolons or
+newlines between commands.  Within I<COMMAND_STRING>, virsh understands the
 same single, double, and backslash escapes as the shell, although you must
 add another layer of shell escaping in creating the single shell argument.
 If no command is given in the command line, B<virsh> will then start a minimal

tools/virt-admin.pod

@@ -23,8 +23,8 @@ Where I<command> is one of the commands listed below.
 The B<virt-admin> program can be used either to run one I<COMMAND> by giving the
 command and its arguments on the shell command line, or a I<COMMAND_STRING>
 which is a single shell argument consisting of multiple I<COMMAND> actions
-and their arguments joined with whitespace, and separated by semicolons
-between commands.  Within I<COMMAND_STRING>, virt-admin understands the
+and their arguments joined with whitespace and separated by semicolons or
+newlines between commands.  Within I<COMMAND_STRING>, virt-admin understands the
 same single, double, and backslash escapes as the shell, although you must
 add another layer of shell escaping in creating the single shell argument.
 If no command is given in the command line, B<virt-admin> will then start a minimal

tools/vsh.c

@@ -1664,7 +1664,7 @@ vshCommandStringGetArg(vshControl *ctl, vshCommandParser *parser, char **res,
 
     if (*p == '\0')
         return VSH_TK_END;
-    if (*p == ';') {
+    if (*p == ';' || *p == '\n') {
         parser->pos = ++p;             /* = \0 or begin of next command */
         return VSH_TK_SUBCMD_END;
     }
@@ -1672,7 +1672,7 @@ vshCommandStringGetArg(vshControl *ctl, vshCommandParser *parser, char **res,
     while (*p) {
         /* end of token is blank space or ';' */
         if (!double_quote && !single_quote &&
-            (*p == ' ' || *p == '\t' || *p == ';'))
+            (*p == ' ' || *p == '\t' || *p == ';' || *p == '\n'))
             break;
 
         if (!double_quote && *p == '\'') { /* single quote */