add command dependency in shell execution

libopenfpga/libopenfpgashell/src/shell.h

@@ -108,7 +108,7 @@ class Shell {
     void set_command_execute_function(const ShellCommandId& cmd_id,
                                       std::function<int(int, char**)> exec_func);
     void set_command_dependency(const ShellCommandId& cmd_id,
-                                const std::vector<ShellCommandId> cmd_dependency);
+                                const std::vector<ShellCommandId>& cmd_dependency);
     ShellCommandClassId add_command_class(const char* name);
   public: /* Public validators */
     bool valid_command_id(const ShellCommandId& cmd_id) const;
@@ -174,6 +174,9 @@ class Shell {
      */
     vtr::vector<ShellCommandId, e_exec_func_type> command_execute_function_types_;  
 
+    /* A flag to indicate if the command has been executed */  
+    vtr::vector<ShellCommandId, bool> command_status_;  
+
     /* Dependency graph for different commands,
      * This helps the shell interface to check if a command need other commands to be run before its execution  
      */

libopenfpga/libopenfpgashell/src/shell.tpp

@@ -131,6 +131,7 @@ ShellCommandId Shell<T>::add_command(const Command& cmd, const char* descr) {
   command_short_execute_functions_.emplace_back();
   command_builtin_execute_functions_.emplace_back();
   command_macro_execute_functions_.emplace_back();
+  command_status_.push_back(false); /* By default, the command should be marked as never executed */
   command_dependencies_.emplace_back();
 
   /* Register the name in the name2id map */
@@ -202,7 +203,7 @@ void Shell<T>::set_command_execute_function(const ShellCommandId& cmd_id,
 
 template<class T>
 void Shell<T>::set_command_dependency(const ShellCommandId& cmd_id,
-                                      const std::vector<ShellCommandId> dependent_cmds) {
+                                      const std::vector<ShellCommandId>& dependent_cmds) {
   /* Validate the command id as well as each of the command dependency */
   VTR_ASSERT(true == valid_command_id(cmd_id));
   for (ShellCommandId dependent_cmd : dependent_cmds) {
@@ -362,7 +363,14 @@ void Shell<T>::execute_command(const char* cmd_line,
     return;
   }
 
-  /* TODO: Check the dependency graph to see if all the prequistics have been met */
+  /* Check the dependency graph to see if all the prequistics have been met */
+  for (const ShellCommandId& dep_cmd : command_dependencies_[cmd_id]) {
+    if (false == command_status_[dep_cmd]) {
+      VTR_LOG("Command '%s' is required to be executed before command '%s'!\n",
+              commands_[dep_cmd].name().c_str(), commands_[cmd_id].name().c_str());
+      return;
+    } 
+  }
 
   /* Find the command! Parse the options 
    * Note:
@@ -420,6 +428,9 @@ void Shell<T>::execute_command(const char* cmd_line,
     /* Exit the shell using the exit() function inside this class! */
     exit();
   }
+
+  /* Change the status of the command */
+  command_status_[cmd_id] = true;
 }
 
 /************************************************************************

libopenfpga/libopenfpgashell/test/test_shell.cpp

@@ -102,11 +102,13 @@ int main(int argc, char** argv) {
 
   /* Create a command of 'print' 
    * This function will print the value of an internal variable of ShellContext 
+   * We set a dependency to this command as it MUST be executed after 'set'
    */
   Command shell_cmd_print("print");
   ShellCommandId shell_cmd_print_id = shell.add_command(shell_cmd_print, "Print the value of internal variable 'a'");
   shell.set_command_class(shell_cmd_print_id, arith_cmd_class);
   shell.set_command_execute_function(shell_cmd_print_id, shell_execute_print);
+  shell.set_command_dependency(shell_cmd_print_id, std::vector<ShellCommandId>(1, shell_cmd_set_id));
 
   /* Create a macro command of 'print_macro' 
    * This function will print the value of an internal variable of ShellContext