test: add tool multi-user integration test

Rather hacked up quickly but does the job for now...

Closes #204

test/.gitignore

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+send_input

test/README.md

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+# Gromit-MPX Integration Tests
+
+## Tool Multi-User Test
+
+What this quick and dirty shell script does is:
+
+- start Gromit-MPX
+- add two new XI2 pointer-keyboard pairs
+- simultaneously do an action with both of them
+- remove them again
+
+Launch with `./test-tool-multi-user.sh <path to gromit-mpx> <tool>`, e.g.
+
+`./test-tool-multi-user.sh ../build/gromit-mpx PEN`
+
+or
+
+`./test-tool-multi-user.sh ../build/gromit-mpx RECT`
+
+or any other tool.

test/send_input.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <X11/Xlib.h>
+#include <X11/extensions/XTest.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]) {
+    if (argc != 3) {
+        printf("Usage: %s <device_id> <offset>\n", argv[0]);
+        return 1;
+    }
+
+    Display *display = XOpenDisplay(NULL);
+    if (!display) {
+        fprintf(stderr, "Unable to open display.\n");
+        return 1;
+    }
+
+    int device_id = atoi(argv[1]);
+    XDevice xdev;
+    xdev.device_id = device_id;
+
+    int offset = atoi(argv[2]);
+
+    // Move the pointer to (100+offset, 100)
+    int axes[] = {100 + offset, 100};
+    XTestFakeDeviceMotionEvent(display, &xdev, 0, 0, axes, 2, 0);
+
+    // Press the left button.
+    XTestFakeDeviceButtonEvent(display, &xdev, 1, True, NULL, 0, 0);
+
+    // Move the pointer to (300+offset, 300) in steps of 10
+    for(int i = 0; i < 20; ++i) {
+        axes[0] += 10;
+        axes[1] += 10;
+        XTestFakeDeviceMotionEvent(display, &xdev, 0, 0, axes, 2, 0);
+        usleep(100*1000);
+        XFlush(display);
+    }
+
+    // Release the left button.
+    XTestFakeDeviceButtonEvent(display, &xdev, 1, False, NULL, 0, 0);
+
+    // Close the display connection.
+    XCloseDisplay(display);
+
+    return 0;
+}

test/test-tool-multi-user.sh

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+#!/bin/sh
+#
+# Quick and dirty tool tester.
+#
+# Things to improve:
+#  - get rid of user cfg modification
+#  - get rid of sleep's
+#  - move more/all functionality to native code
+
+
+GROMIT_MPX="$1"
+TOOL="$2"
+
+[ -z "$GROMIT_MPX" ] || [ -z "$TOOL" ] && {
+    echo "./test-tool-multi-user.sh <path to gromit-mpx> <tool>"
+    exit 1
+}
+
+mv ~/.config/gromit-mpx.cfg ~/.config/gromit-mpx.cfg.bak
+echo \
+'
+"test-tool" = '"$TOOL"' (size=5 color="green");
+"default" = "test-tool";
+' > ~/.config/gromit-mpx.cfg
+
+echo "\033[32mbuilding helper\033[0m"
+cc -o send_input send_input.c -lX11 -lXtst
+
+echo "\033[32mlaunching gromit-mpx\033[0m"
+$GROMIT_MPX &
+PID=$!
+
+sleep 1
+
+echo "\033[32mcreating test devices\033[0m"
+xinput create-master one 2>/dev/null
+xinput create-master two 2>/dev/null
+
+ID_ONE=$(xinput list --id-only "one pointer" 2>/dev/null)
+ID_TWO=$(xinput list --id-only "two pointer" 2>/dev/null)
+
+XTEST_ID_ONE=$(xinput list --id-only "one XTEST pointer" 2>/dev/null)
+XTEST_ID_TWO=$(xinput list --id-only "two XTEST pointer" 2>/dev/null)
+
+echo "\033[32mtesting, you should see something in the upper left of the screen; you can also draw manually\033[0m"
+$GROMIT_MPX -t
+sleep 1
+./send_input $XTEST_ID_ONE 100 &
+./send_input $XTEST_ID_TWO 300 &
+sleep 3
+$GROMIT_MPX -t
+
+sleep 1
+
+echo "\033[32mcleaning up\033[0m"
+xinput remove-master $ID_ONE 2>/dev/null
+xinput remove-master $ID_TWO 2>/dev/null
+
+kill $PID
+
+mv ~/.config/gromit-mpx.cfg.bak ~/.config/gromit-mpx.cfg
+
+echo "\033[32mdone\033[0m"