Add TODOs to readme

You can pass files / dirs as arguments an they will be opened. The
directories will be searched for text files (as identified by libmagic)
and those text files will be displayed too.

.gitignore

@@ -1,2 +1,2 @@
-/.zig-cache/
+/zig-cache/
 /zig-out/

build.zig

@@ -1,21 +1,19 @@
-const std = @import("std");
+const Builder = @import("std").build.Builder;
 
-pub fn build(b: *std.Build) void {
+pub fn build(b: *Builder) void {
-    const exe = b.addExecutable(.{
+    const mode = b.standardReleaseOptions();
-        .name = "docmap",
+    const exe = b.addExecutable("docmap", "src/main.zig");
-        .root_source_file = b.path("src/main.zig"),
-        .target = b.standardTargetOptions(.{}),
-        .optimize = b.standardOptimizeOption(.{}),
-    });
-
-    exe.addIncludePath(.{ .cwd_relative = "C:/Users/nathanm/Downloads/SDL2-devel-2.26.5-mingw/SDL2-2.26.5/x86_64-w64-mingw32/include/SDL2" });
-    exe.addIncludePath(.{ .cwd_relative = "C:/Users/nathanm/Downloads/SDL2_ttf-devel-2.24.0-mingw/SDL2_ttf-2.24.0/x86_64-w64-mingw32/include/SDL2" });
-
-    exe.addObjectFile(.{ .cwd_relative = "C:/Users/nathanm/Downloads/SDL2-devel-2.30.11-mingw/SDL2-2.30.11/x86_64-w64-mingw32/bin/SDL2.dll" });
-    exe.addObjectFile(.{ .cwd_relative = "C:/Users/nathanm/Downloads/SDL2_ttf-devel-2.24.0-mingw/SDL2_ttf-2.24.0/x86_64-w64-mingw32/bin/SDL2_ttf.dll" });
     
+    exe.setBuildMode(mode);
+    exe.linkSystemLibrary("SDL2");
+    exe.linkSystemLibrary("SDL2_TTF");
+    exe.linkSystemLibrary("magic");
     exe.linkSystemLibrary("c");
 
     b.default_step.dependOn(&exe.step);
     b.installArtifact(exe);
+
+    const run = b.step("run", "Run the demo");
+    const run_cmd = exe.run();
+    run.dependOn(&run_cmd.step);
 }

src/main.zig

@@ -25,12 +25,18 @@ const FileDocMap = struct {
 pub fn main() !void {
     var gpa = std.heap.GeneralPurposeAllocator(.{}){};
     defer {
-        const deinit_status = gpa.deinit();
+        if (gpa.deinit()) {
-        if (deinit_status == .leak) {
             std.debug.print("Allocator leak\n", .{});
         }
     }
 
+    var magic = m.magic_open(m.MAGIC_MIME | m.MAGIC_CHECK);
+    const load_result = m.magic_load(magic, null);
+    if (load_result != 0) {
+        std.debug.print("Unable to initialize magic: {d}", .{load_result});
+        return error.MagicInitializationFailed;
+    }
+
     const allocator = gpa.allocator();
 
     const args = try std.process.argsAlloc(allocator);
@@ -46,7 +52,7 @@ pub fn main() !void {
     }
     defer c.SDL_Quit();
 
-    const screen = c.SDL_CreateWindow("Document Map Viewer", c.SDL_WINDOWPOS_UNDEFINED, c.SDL_WINDOWPOS_UNDEFINED, window_width, window_height, c.SDL_WINDOW_OPENGL | c.SDL_WINDOW_RESIZABLE) orelse
+    const screen = c.SDL_CreateWindow("Document Map Viewer", c.SDL_WINDOWPOS_UNDEFINED, c.SDL_WINDOWPOS_UNDEFINED, window_width, window_height, c.SDL_WINDOW_OPENGL) orelse
         {
         c.SDL_Log("Unable to create window: %s", c.SDL_GetError());
         return error.SDLInitializationFailed;
@@ -75,7 +81,12 @@ pub fn main() !void {
     }
     defer c.TTF_Quit();
 
-    const text_color: c.SDL_Color = c.SDL_Color{ .r = 0, .g = 0, .b = 0, .a = 255 };
+    const text_color: c.SDL_Color = c.SDL_Color{
+        .r = 0,
+        .g = 0,
+        .b = 0,
+        .a = 255
+    };
 
     // TODO: can we embed this file?
     const font: ?*c.TTF_Font = c.TTF_OpenFont("FreeSans.ttf", 12);
@@ -96,19 +107,21 @@ pub fn main() !void {
     var args_i: usize = 1;
     while (args_i < args.len) : (args_i += 1) {
         const arg = args[args_i];
-        if (std.fs.cwd().openDir(arg, .{ .iterate = true })) |iter_dir| {
+        if (std.fs.cwd().openIterableDir(arg, .{})) |iter_dir| {
             std.debug.print("searching dir for files: '{s}'\n", .{arg});
 
             var iter = iter_dir.iterate();
             while (try iter.next()) |entry| {
-                if (entry.kind == .file) {
+                if (entry.kind == .File) {
                     const entry_path = try std.fmt.allocPrint(allocator, "{s}{c}{s}\x00", .{
                         arg,
                         std.fs.path.sep,
                         entry.name,
                     });
-                    if (std.mem.eql(u8, entry.name[(entry.name.len - 4)..(entry.name.len)], ".org")) {
+                    const magic_result = m.magic_file(magic, @ptrCast([*c]const u8, entry_path));
-                        try file_paths.append(entry_path[0..(entry_path.len)]);
+                    std.debug.print("'{s}': {s}\n", .{ entry.name, magic_result });
+                    if (std.mem.eql(u8, magic_result[0..5], "text/")) {
+                        try file_paths.append(entry_path[0..(entry_path.len - 1)]);
                     } else {
                         allocator.free(entry_path);
                     }
@@ -118,8 +131,8 @@ pub fn main() !void {
             if (std.fs.cwd().openFile(arg, .{})) |file| {
                 file.close();
                 std.debug.print("Will do docmap for: '{s}'\n", .{arg});
-                const path = try allocator.alloc(u8, arg.len);
+                var path = try allocator.alloc(u8, arg.len);
-                @memcpy(path, arg);
+                std.mem.copy(u8, path, arg);
                 try file_paths.append(path);
             } else |_| {
                 std.debug.print("Arg not file: '{s}'\n", .{arg});
@@ -137,7 +150,7 @@ pub fn main() !void {
             file_name = token;
         }
         
-        const surface: [*c]c.SDL_Surface = c.TTF_RenderText_Solid(font, @ptrCast(file_name), text_color);
+        const surface: [*c]c.SDL_Surface = c.TTF_RenderText_Solid(font, @ptrCast([*c]const u8, file_name), text_color);
         if (surface == null) {
             c.SDL_Log("Unable to render text");
             return error.RenderTextFailed;
@@ -149,7 +162,7 @@ pub fn main() !void {
             return error.CreateTextureFailed;
         }
 
-        const rect = c.SDL_Rect{
+        var rect = c.SDL_Rect{
             .x = 0,
             .y = 0,
             .w = surface.*.w,
@@ -161,7 +174,7 @@ pub fn main() !void {
         defer file.close();
 
         const stat = try file.stat();
-        const buffer = try allocator.alloc(u8, stat.size);
+        var buffer = try allocator.alloc(u8, stat.size);
 
         const bytes_read = try file.readAll(buffer);
         if (bytes_read != stat.size) {
@@ -172,7 +185,7 @@ pub fn main() !void {
             return error.FileReadError;
         }
 
-        const docmap = FileDocMap{
+        var docmap = FileDocMap{
             .title_text = DrawnText{
                 .surface = surface,
                 .texture = texture,
@@ -201,7 +214,7 @@ pub fn main() !void {
     while (!quit) {
         var event: c.SDL_Event = undefined;
         while (c.SDL_PollEvent(&event) != 0) {
-            switch (event.type) {
+            switch (event.@"type") {
                 c.SDL_QUIT => {
                     quit = true;
                 },