fix(shell): add help command and fix crete table filed complete include binary

tools/shell/inc/shellAuto.h

@@ -39,4 +39,7 @@ void callbackAutoTab(char* sqlstr, TAOS* pSql, bool usedb);
 // introduction
 void printfIntroduction();
 
+// show all commands help 
+void showHelp();
+
 #endif

tools/shell/src/shellAuto.c

@@ -108,6 +108,7 @@ SWords shellCommands[] = {
     {"drop topic <topic_name> ;", 0, 0, NULL},
     {"drop stream <stream_name> ;", 0, 0, NULL},
     {"explain select", 0, 0, NULL},  // 44 append sub sql
+    {"help;", 0, 0, NULL},
     {"grant all on <anyword> to <user_name> ;", 0, 0, NULL},
     {"grant read on <anyword> to <user_name> ;", 0, 0, NULL},
     {"grant write on <anyword> to <user_name> ;", 0, 0, NULL},
@@ -386,6 +387,8 @@ void showHelp() {
     drop stream <stream_name> ;\n\
   ----- E ----- \n\
     explain select clause ...\n\
+  ----- H ----- \n\
+    help;\n\
   ----- I ----- \n\
     insert into <tb_name> values(...) ;\n\
     insert into <tb_name> using <stb_name> tags(...) values(...) ;\n\
@@ -1478,24 +1481,36 @@ bool matchSelectQuery(TAOS* con, SShellCmd* cmd) {
 
 // if is input create fields or tags area, return true
 bool isCreateFieldsArea(char* p) {
-  char* left = strrchr(p, '(');
+  // put to while, support like create table st(ts timestamp, bin1 binary(16), bin2 + blank + TAB 
+  char* p1 = strdup(p);
+  bool ret = false;
+  while (1) {
+    char* left = strrchr(p1, '(');
     if (left == NULL) {
       // like 'create table st'
-    return false;
+      ret = false;
+      break;
     }
 
-  char* right = strrchr(p, ')');
+    char* right = strrchr(p1, ')');
     if (right == NULL) {
       // like 'create table st( '
-    return true;
+      ret = true;
+      break;
     }
 
     if (left > right) {
       // like 'create table st( ts timestamp, age int) tags(area '
-    return true;
+      ret = true;
+      break;
     }
     
-  return false;
+    // set string end by small for next strrchr search
+    *left = 0;
+  }
+  taosMemoryFree(p1);
+
+  return ret;
 }
 
 bool matchCreateTable(TAOS* con, SShellCmd* cmd) {

tools/shell/src/shellEngine.c

@@ -134,6 +134,12 @@ int32_t shellRunCommand(char *command, bool recordHistory) {
     return 0;
   }
 
+  // add help or help; 
+  if(strcmp(command, "help") == 0 || strcmp(command, "help;") == 0) {
+    showHelp();
+    return 0;
+  }
+
   if (recordHistory) shellRecordCommandToHistory(command);
 
   char quote = 0, *cmd = command;