Users: add new module

I don't think it's very useful but neofetch support it

CMakeLists.txt

@@ -242,6 +242,7 @@ set(LIBFASTFETCH_SRC
     src/modules/colors.c
     src/modules/opengl.c
     src/modules/opencl.c
+    src/modules/users.c
 )
 
 if(BSD OR APPLE)

presets/all

@@ -1 +1 @@
---structure Title:Separator:OS:Host:Kernel:Uptime:Processes:Packages:Shell:Resolution:DE:WM:WMTheme:Theme:Icons:Font:Cursor:Terminal:TerminalFont:CPU:GPU:Memory:Swap:Disk:Battery:PowerAdapter:Player:Song:PublicIP:LocalIP:DateTime:Locale:Vulkan:OpenGL:OpenCL:Break:Colors
+--structure Title:Separator:OS:Host:Kernel:Uptime:Processes:Packages:Shell:Resolution:DE:WM:WMTheme:Theme:Icons:Font:Cursor:Terminal:TerminalFont:CPU:GPU:Memory:Swap:Disk:Battery:PowerAdapter:Player:Song:PublicIP:LocalIP:DateTime:Locale:Vulkan:OpenGL:OpenCL:Users:Break:Colors

src/fastfetch.c

@@ -1436,6 +1436,8 @@ static void parseStructureCommand(FFinstance* instance, FFdata* data, const char
         ffPrintOpenGL(instance);
     else if(strcasecmp(line, "opencl") == 0)
         ffPrintOpenCL(instance);
+    else if(strcasecmp(line, "users") == 0)
+        ffPrintUsers(instance);
     else
         ffPrintErrorString(instance, line, 0, NULL, NULL, "<no implementation provided>");
 }

src/fastfetch.h

@@ -276,5 +276,6 @@ void ffPrintColors(FFinstance* instance);
 void ffPrintVulkan(FFinstance* instance);
 void ffPrintOpenGL(FFinstance* instance);
 void ffPrintOpenCL(FFinstance* instance);
+void ffPrintUsers(FFinstance* instance);
 
 #endif

src/flashfetch.c

@@ -52,6 +52,7 @@ int main(int argc, char** argv)
     //ffPrintVulkan(&instance);
     //ffPrintOpenGL(&instance);
     //ffPrintOpenCL(&instance);
+    //ffPrintUsers(&instance);
     ffPrintBreak(&instance);
     ffPrintColors(&instance);
 

src/modules/users.c

@@ -0,0 +1,54 @@
+#include "fastfetch.h"
+#include "common/printing.h"
+
+#include <utmpx.h>
+
+#define FF_USERS_MODULE_NAME "Users"
+#define FF_USERS_NUM_FORMAT_ARGS 1
+
+void ffPrintUsers(FFinstance* instance)
+{
+    struct utmpx* n = NULL;
+    setutxent();
+
+    FFlist users;
+    ffListInit(&users, sizeof(n->ut_user));
+
+next:
+    while((n = getutxent()))
+    {
+        if(n->ut_type == USER_PROCESS)
+        {
+            for(uint32_t i = 0; i < users.length; ++i)
+            {
+                if(strcmp((const char*)ffListGet(&users, i), n->ut_user) == 0)
+                    goto next;
+            }
+            strcpy((char*)ffListAdd(&users), n->ut_user);
+        }
+    }
+
+    FFstrbuf result;
+    ffStrbufInit(&result);
+    for(uint32_t i = 0; i < users.length; ++i)
+    {
+        if(i > 0)
+            ffStrbufAppendS(&result, ", ");
+        ffStrbufAppendS(&result, (const char*)ffListGet(&users, i));
+    }
+    ffListDestroy(&users);
+
+    if(instance->config.uptime.outputFormat.length == 0)
+    {
+        ffPrintLogoAndKey(instance, FF_USERS_MODULE_NAME, 0, &instance->config.uptime.key);
+        puts(result.chars);
+    }
+    else
+    {
+        ffPrintFormat(instance, FF_USERS_MODULE_NAME, 0, &instance->config.uptime, FF_USERS_NUM_FORMAT_ARGS, (FFformatarg[]){
+            {FF_FORMAT_ARG_TYPE_STRBUF, &result},
+        });
+    }
+
+    ffStrbufDestroy(&result);
+}