Add dump subcommandHEADmaster

2 files changed, 123 insertions, 39 deletions

diff --git a/src/dump.zig b/src/dump.zig
new file mode 100644
index 0000000..a41b2be
--- /dev/null
+++ b/src/dump.zig
@@ -0,0 +1,109 @@
+const std = @import("std");
+const adler32 = std.hash.Adler32;
+const openFlags = std.fs.File.OpenFlags{
+    .read = true,
+    .write = false,
+    .lock = std.fs.File.Lock.None,
+};
+const output_flags = std.fs.File.CreateFlags{
+    .read = false,
+    .truncate = true,
+    .exclusive = false,
+    .lock = std.fs.File.Lock.None,
+};
+
+fn help(args: [][]u8) u8 {
+    std.debug.warn(
+        \\Usage: {} {} [-h] [-o OUTPUT] input ...
+        \\
+        \\Optional arguments:
+        \\  -h, --help              show this help message and exit
+        \\  -o, --output OUTPUT     output header file (by default, stdout)
+        \\
+        \\Positional arguments:
+        \\  input                   one or more input files
+        \\
+    , .{ args[0], args[1] });
+    return if (args.len < 3) 255 else 0;
+}
+
+pub fn cmd(args: [][]u8) u8 {
+    if (args.len < 3) {
+        return help(args);
+    }
+
+    const State = enum {
+        Start,
+        OptionOutput,
+    };
+
+    var output_file: ?std.fs.File = null;
+    defer if (output_file != null) output_file.?.close();
+
+    var input_index: ?usize = null;
+    var state: State = State.Start;
+
+    parse_args: for (args[2..args.len]) |c, i| {
+        switch (state) {
+            State.Start => {
+                switch (adler32.hash(c)) {
+                    adler32.hash("-h"), adler32.hash("--help") => return help(args),
+                    adler32.hash("-o"), adler32.hash("--output") => state = State.OptionOutput,
+                    else => {
+                        if (input_index == null) {
+                            input_index = i;
+                            break :parse_args;
+                        }
+                    },
+                }
+            },
+            State.OptionOutput => {
+                output_file = switch (std.fs.path.isAbsolute(c)) {
+                    true => std.fs.createFileAbsolute(c, output_flags) catch return 128,
+                    false => std.fs.cwd().createFile(c, output_flags) catch return 128,
+                };
+                state = State.Start;
+            },
+        }
+    }
+
+    var output = (output_file orelse std.io.getStdOut()).outStream();
+
+    if (input_index == null)
+        return help(args);
+
+    for (args[2 + input_index.? .. args.len]) |path| {
+        output.print("// {}\n", .{path}) catch return 1;
+        hexdump(output, path, path) catch std.debug.warn("// Could not read file '{}'\n", .{path});
+    }
+
+    return 0;
+}
+
+fn hexdump(out: std.fs.File.OutStream, path: []const u8, name: []const u8) !void {
+    var file = switch (std.fs.path.isAbsolute(path)) {
+        true => try std.fs.openFileAbsolute(path, openFlags),
+        false => try std.fs.cwd().openFile(path, openFlags),
+    };
+    defer file.close();
+
+    var buffer: [16]u8 = undefined;
+    var r: u64 = undefined;
+    var l: u64 = 0;
+
+    try out.print("constexpr uint8_t {}_data[] = {{\n", .{name});
+    while (true) {
+        r = file.read(&buffer) catch break;
+        if (r <= 0)
+            break;
+
+        l += r;
+        try out.print("  ", .{});
+        for (buffer[0..r]) |c| {
+            try out.print("0x{x:2}, ", .{c});
+        }
+        try out.print("\n", .{});
+    }
+    try out.print("}};\n", .{});
+    try out.print("constexpr size_t {}_len = {};\n\n", .{ name, l });
+}
diff --git a/src/main.zig b/src/main.zig
index 1b8f702..c45cbed 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -1,43 +1,19 @@
 const std = @import("std");
+const dump = @import("dump.zig");
 const adler32 = std.hash.Adler32;
-const openFlags = std.fs.File.OpenFlags{
-    .read = true,
-    .write = false,
-    .lock = std.fs.File.Lock.None,
-};
-
-fn dump(args: [][]u8) u8 {
-    if (args.len < 3) {
-        std.debug.warn("Usage: {} [subcommand] [options]\n", .{args[0]});
-        return 255;
-    }
-
-    var file = std.fs.openFileAbsolute(args[2], openFlags) catch {
-        std.debug.warn("Cannot open file {}\n", .{args[2]});
-        return 255;
-    };
-    defer file.close();
-
-    var buffer: [16]u8 = undefined;
-    var r: u64 = undefined;
-    while (true) {
-        r = file.read(&buffer) catch {
-            break;
-        };
-        if (r <= 0)
-            break;
-
-        for (buffer[0..r]) |c| {
-            std.debug.warn("0x{x:2} ", .{c});
-        }
-        std.debug.warn(" -- {}\n", .{r});
-    }
-
-    return 0;
-}
 
 fn help(args: [][]u8) u8 {
-    std.debug.warn("Usage: {} [subcommand] [options]\n", .{args[0]});
+    std.debug.warn(
+        \\Usage: {} [subcommand] [options]
+        \\
+        \\Resource Compiler for C++
+        \\
+        \\Subcommands:
+        \\  dump [options] inputs   hexdump the input files
+        \\
+        \\For a full list of subcommand options, use [subcommand] --help
+        \\
+    , .{args[0]});
     return if (args.len < 2) 255 else 0;
 }
 
@@ -45,15 +21,14 @@ pub fn main() anyerror!u8 {
     var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
     defer arena.deinit();
 
-    std.debug.warn("All your codebase are belong to us.\n\n", .{});
-
     const args = try std.process.argsAlloc(&arena.allocator);
     if (args.len < 2) {
         return help(args);
     }
 
     return switch (adler32.hash(args[1])) {
-        adler32.hash("dump") => dump(args),
+        adler32.hash("dump") => dump.cmd(args),
+        adler32.hash("-h"), adler32.hash("--help") => help(args),
         else => help(args),
     };
 }