Add status service command (#54)

* Use std::unique_ptr for stop service

* Use std::unique_ptr for stop service

* Add status command

* Prefer to use std::array to avoid memory leaking in buffer

* Perform xdo key sequence before output message

* Fix missing swipe_gesture header in regex implementation

Author: Hikari9

.gitignore

@@ -1,2 +1,6 @@
 # C++ generated headers
 *.gch
+
+# IDE-specific
+.idea
+.vscode

comfortable-swipe.cpp

@@ -54,6 +54,9 @@ int main(int argc, char** args)
         else if (arg == "debug")
             comfortable_swipe::service::debug();
 
+        else if (arg == "status")
+            comfortable_swipe::service::status();
+
         else /* if (arg == "help") */
             comfortable_swipe::service::help();
     }

lib/comfortable_swipe

@@ -34,6 +34,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "service/help.cpp"
 #include "service/restart.cpp"
 #include "service/start.cpp"
+#include "service/status.cpp"
 #include "service/stop.cpp"
 #include "util/autostart_filename.cpp"
 #include "util/conf_filename.cpp"

lib/gesture/swipe_gesture.cpp

@@ -116,10 +116,10 @@ namespace comfortable_swipe::gesture
             if (this->previous_gesture == swipe_gesture::FRESH
                 || this->previous_gesture == (mask ^ swipe_gesture::MSK_POSITIVE))
             {
+                xdo_send_keysequence_window(this->xdo, CURRENTWINDOW, swipe_gesture::commands[mask], 0);
                 this->x = this->y = 0;
                 this->previous_gesture = mask;
                 std::cout << "SWIPE " << swipe_gesture::command_map[mask] << std::endl;
-                xdo_send_keysequence_window(xdo, CURRENTWINDOW, swipe_gesture::commands[mask], 0);
             }
         }
     }

lib/gesture/swipe_gesture.regex.cpp

@@ -19,12 +19,14 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include "swipe_gesture.h"
+
 namespace comfortable_swipe::gesture
 {
     /**
      * Regex pattern for the libinput entry for start of swipe.
      * Extracts one match for the number of fingers used during the swipe.
-     * 
+     *
      * eg. event15  GESTURE_SWIPE_BEGIN +34.33s 3
      *                                          ^
      *                                        fingers
@@ -41,7 +43,7 @@ namespace comfortable_swipe::gesture
     /**
      * Regex pattern for the libinput entry for the end of swipe.
      * Extracts one match for the number of fingers used during the swipe.
-     * 
+     *
      * eg. event15  GESTURE_SWIPE_END +35.03s   3
      *                                          ^
      *                                        fingers
@@ -64,7 +66,7 @@ namespace comfortable_swipe::gesture
     /**
      * Regex pattern for the libinput entry for during a swipe.
      * Extracts number of fingers used and the speed (normal and accelerated) of the swipe.
-     * 
+     *
      * eg. event15  GESTURE_SWIPE_UPDATE +34.70s    3 -0.12/ 4.99 (-0.33/13.50 unaccelerated)
      *                                              ^    ^    ^      ^     ^
      *                                          fingers  dx   dy    udx   udy

lib/index.hpp

@@ -54,6 +54,7 @@ extern "C"
             void help();
             void restart();
             void start();
+            void status();
             void stop();
         }
     }

lib/service/buffer.cpp

@@ -19,7 +19,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-#include <cstdio> // std::fgets_unlocked, stdin
+#include <cstdio> // fgets_unlocked, stdin
 #include "../index.hpp"
 
 /**
@@ -47,14 +47,13 @@ namespace comfortable_swipe::service
         );
 
         // prepare data containers
-        static const int MAX_LINE_LENGTH = 256;
-        static char data[MAX_LINE_LENGTH];
+        std::array<char, 256> line;
 
         // start reading lines from input one by one
-        while (fgets_unlocked(data, MAX_LINE_LENGTH, stdin) != NULL)
+        while (fgets_unlocked(line.data(), line.size(), stdin) != NULL)
         {
             // attempt to parse swipe gestures
-            swipe_gesture_handler.parse_line(data);
+            swipe_gesture_handler.parse_line(line.data());
         }
     }
 }

lib/service/help.cpp

@@ -39,6 +39,7 @@ namespace comfortable_swipe::service
         std::puts("buffer     - parses output of libinput debug-events");
         std::puts("help       - shows the help dialog");
         std::puts("debug      - logs raw output from input events taken from libinput");
+        std::puts("status     - checks status of program and autostart");
         std::puts("");
         std::printf("Configuration file can be found in %s\n", conf_filename());
     }

lib/service/status.cpp

@@ -0,0 +1,58 @@
+#ifndef __COMFORTABLE_SWIPE__service_status__
+#define __COMFORTABLE_SWIPE__service_status__
+
+/*
+Comfortable Swipe
+by Rico Tiongson
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "../index.hpp"
+#include <stdexcept> // std::runtime_error
+#include <unistd.h> // popen, pclose, getpid, access, F_OK
+#include <memory> // std::unique_ptr
+#include <array> // std::array
+#include <cstdlib> // std::atoi
+#include <cstdio> // FILE, std::feof, std::fgets, std::printf
+
+namespace comfortable_swipe::service
+{
+    /**
+     * Restarts the comfortable-swipe service.
+     */
+    void status()
+    {
+        // check if comfortable-swipe is running
+        bool running = false;
+        std::array<char, 128> buffer;
+        std::unique_ptr<FILE, decltype(&pclose)> pipe(popen("pgrep -f comfortable-swipe", "r"), pclose);
+        if (pipe && !std::feof(pipe.get()) && std::fgets(buffer.data(), buffer.size(), pipe.get()) != NULL)
+        {
+            int pid = std::atoi(buffer.data());
+            if (pid != getpid())
+                running = true;
+        }
+
+        // check if autostart is on
+        auto autostart_f = comfortable_swipe::util::autostart_filename();
+        bool autostart_on = access(autostart_f, F_OK) != -1;
+
+        // print status
+        std::printf("program is %s\n", running ? "ON" : "OFF");
+        std::printf("autostart is %s\n", autostart_on ? "ON" : "OFF");
+    }
+}
+
+#endif /* __COMFORTABLE_SWIPE__service_restart__ */

lib/service/stop.cpp

@@ -24,6 +24,10 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 #include <stdexcept> // std::runtime_error
 #include <unistd.h> // popen, pclose, getpid
+#include <memory> // std::unique_ptr
+#include <array> // std::array
+#include <cstdlib> // std::atoi
+#include <cstdio> // FILE, std::feof, std::fgets
 
 namespace comfortable_swipe::service
 {
@@ -34,24 +38,22 @@ namespace comfortable_swipe::service
     {
 
         // read all service names from process (pgrep)
-        char* buffer = new char[20];
-        FILE* pipe = popen("pgrep -f comfortable-swipe", "r");
-        
+        std::array<char, 128> buffer;
+        std::unique_ptr<FILE, decltype(&pclose)> pipe(popen("pgrep -f comfortable-swipe", "r"), pclose);
+
         // make sure pipe exists
-        if (pipe == NULL)
-        {
+        if (!pipe)
             throw std::runtime_error("stop command failed");
-        }
 
         // buffer what to kill
         std::string kill = "kill";
 
         // read until end of line
-        while (!std::feof(pipe))
+        while (!std::feof(pipe.get()))
         {
-            if (std::fgets(buffer, 20, pipe) != NULL)
+            if (std::fgets(buffer.data(), buffer.size(), pipe.get()) != NULL)
             {
-                int pid = std::atoi(buffer);
+                int pid = std::atoi(buffer.data());
                 if (pid != getpid())
                 {
                     kill += " ";
@@ -62,11 +64,6 @@ namespace comfortable_swipe::service
 
         // run "kill {pid1} {pid2}..."
         (void) std::system(kill.data());
-        delete[] buffer;
-
-        // close the pipe 
-        pclose(pipe);
-
     }
 }