Command: an attempt to add a new module which can run custom shell scripts

src/modules/command.c

@@ -0,0 +1,67 @@
+#include "fastfetch.h"
+
+#include "common/printing.h"
+#include "common/processing.h"
+#include "util/textModifier.h"
+
+#define FF_COMMAND_MODULE_NAME "Command"
+
+static void printError(FFinstance* instance, const char* key, const char* error)
+{
+    ffPrintLogoAndKey(instance, key, 0, NULL);
+
+    if(instance->config.pipe)
+        fputs(FASTFETCH_TEXT_MODIFIER_ERROR, stdout);
+
+    fputs(error, stdout);
+
+    if(!instance->config.pipe)
+        fputs(FASTFETCH_TEXT_MODIFIER_RESET, stdout);
+
+    putchar('\n');
+}
+
+void ffPrintCommand(FFinstance* instance)
+{
+    FF_STRBUF_AUTO_DESTROY key;
+    ffStrbufInit(&key);
+
+    if(!ffListShift(&instance->config.commandKeys, &key))
+        ffStrbufInitS(&key, FF_COMMAND_MODULE_NAME);
+
+    FF_STRBUF_AUTO_DESTROY text;
+    ffStrbufInit(&text);
+    if(!ffListShift(&instance->config.commandTexts, &text))
+    {
+        printError(instance, key.chars, "No command text left");
+        return;
+    }
+
+    FF_STRBUF_AUTO_DESTROY result;
+    ffStrbufInit(&result);
+    const char* error = ffProcessAppendStdOut(&result, (char* const[]){
+        instance->config.commandShell.chars,
+        #ifdef _WIN32
+        "/c",
+        #else
+        "-c",
+        #endif
+        text.chars,
+        NULL
+    });
+
+    if(error)
+    {
+        printError(instance, key.chars, error);
+        return;
+    }
+
+    if(!result.length)
+    {
+        printError(instance, key.chars, "No result printed");
+        return;
+    }
+
+    ffPrintLogoAndKey(instance, key.chars, 0, NULL);
+    puts(result.chars);
+}