feat(linux): add ram info

src/linux/linux.zig

@@ -15,6 +15,12 @@ pub const CpuInfo = struct {
     cpu_max_freq: f32,
 };
 
+pub const RamInfo = struct {
+    ram_size: f64,
+    ram_usage: f64,
+    ram_usage_percentage: u8,
+};
+
 pub fn getUsername(allocator: std.mem.Allocator) ![]u8 {
     const username = try std.process.getEnvVarOwned(allocator, "USER");
     return username;
@@ -122,3 +128,65 @@ pub fn getCpuInfo(allocator: std.mem.Allocator) !CpuInfo {
         .cpu_max_freq = cpu_max_freq,
     };
 }
+
+pub fn getRamInfo(allocator: std.mem.Allocator) !RamInfo {
+    // Reads /proc/meminfo
+    const meminfo_path = "/proc/meminfo";
+    const file = try std.fs.cwd().openFile(meminfo_path, .{});
+    defer file.close();
+    const meminfo_data = try file.readToEndAlloc(allocator, std.math.maxInt(usize));
+    defer allocator.free(meminfo_data);
+
+    // Parsing /proc/meminfo
+    var total_mem: f64 = 0.0;
+    var free_mem: f64 = 0.0; // remove?
+    var available_mem: f64 = 0.0;
+
+    var total_mem_str: ?[]const u8 = null;
+    var free_mem_str: ?[]const u8 = null;
+    var available_mem_str: ?[]const u8 = null;
+
+    var lines = std.mem.split(u8, meminfo_data, "\n");
+    while (lines.next()) |line| {
+        const trimmed = std.mem.trim(u8, line, " \t");
+        if (std.mem.startsWith(u8, trimmed, "MemTotal")) {
+            var parts = std.mem.split(u8, trimmed, ":");
+            _ = parts.next(); // discards the key
+            if (parts.next()) |value| {
+                total_mem_str = std.mem.trim(u8, value[0..(value.len - 3)], " ");
+                total_mem = try std.fmt.parseFloat(f64, total_mem_str.?);
+            }
+        } else if (std.mem.startsWith(u8, trimmed, "MemFree")) {
+            var parts = std.mem.split(u8, trimmed, ":");
+            _ = parts.next(); // discards the key
+            if (parts.next()) |value| {
+                free_mem_str = std.mem.trim(u8, value[0..(value.len - 3)], " ");
+                free_mem = try std.fmt.parseFloat(f64, free_mem_str.?);
+            }
+        } else if (std.mem.startsWith(u8, trimmed, "MemAvailable")) {
+            var parts = std.mem.split(u8, trimmed, ":");
+            _ = parts.next(); // discards the key
+            if (parts.next()) |value| {
+                available_mem_str = std.mem.trim(u8, value[0..(value.len - 3)], " ");
+                available_mem = try std.fmt.parseFloat(f64, available_mem_str.?);
+            }
+        }
+
+        if ((total_mem_str != null) and (free_mem_str != null) and (available_mem_str != null)) {
+            break;
+        }
+    }
+
+    var used_mem = total_mem - available_mem;
+
+    // Converts KB in GB
+    total_mem /= (1024 * 1024);
+    used_mem /= (1024 * 1024);
+    const ram_usage_percentage: u8 = @as(u8, @intFromFloat((used_mem * 100) / total_mem));
+
+    return RamInfo{
+        .ram_size = total_mem,
+        .ram_usage = used_mem,
+        .ram_usage_percentage = ram_usage_percentage,
+    };
+}