docs.sheetjs.com/docz/static/duk/main.zig

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const std = @import("std");
const duktape = @cImport({
@cInclude("duktape.h");
});
// SheetJS scripts embedded at comptime
const shim = @embedFile("shim.min.js");
const xlsx = @embedFile("xlsx.full.min.js");
pub fn main() !void {
// initialize duktape
const ctx = duktape.duk_create_heap(null, null, null, null, null);
defer _ = duktape.duk_destroy_heap(ctx);
// load SheetJS scripts
_ = duktape.duk_peval_string(ctx, shim);
_ = duktape.duk_peval_string(ctx, xlsx);
// display version number
_ = duktape.duk_peval_string(ctx, "XLSX.version");
const sum = duktape.duk_get_string(ctx, -1);
std.debug.print("SheetJS Version {s}\n", .{sum});
duktape.duk_pop(ctx);
// create allocator
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
defer _ = gpa.deinit();
var alloc = gpa.allocator();
// determine file to read
var args = try std.process.argsWithAllocator(alloc);
defer args.deinit();
_ = args.next();
const path = args.next();
if (path == null) {
std.debug.print("Must specify a filename!", .{});
return;
}
std.debug.print("Reading from {s}\n", .{path.?});
// read file
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const file = try std.fs.cwd().readFileAlloc(alloc, path.?, std.math.maxInt(usize));
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defer alloc.free(file);
std.debug.print("Size: {} bytes\n", .{file.len});
// load into duktape
_ = duktape.duk_push_buffer_raw(ctx, 0, duktape.DUK_BUF_FLAG_DYNAMIC | duktape.DUK_BUF_FLAG_EXTERNAL);
duktape.duk_config_buffer(ctx, -1, file.ptr, file.len);
_ = duktape.duk_put_global_string(ctx, "buf");
_ = duktape.duk_eval_raw(ctx, "workbook = XLSX.read(buf.slice(0, buf.length), {type:'buffer'});", 0, duktape.DUK_COMPILE_EVAL | duktape.DUK_COMPILE_NOSOURCE | duktape.DUK_COMPILE_STRLEN | duktape.DUK_COMPILE_NORESULT | duktape.DUK_COMPILE_NOFILENAME);
// display CSV of first worksheet
_ = duktape.duk_peval_string(ctx, "XLSX.utils.sheet_to_csv(workbook.Sheets[workbook.SheetNames[0]])");
const csv = duktape.duk_get_string(ctx, -1);
std.debug.print("{s}\n", .{csv});
duktape.duk_pop(ctx);
// convert to XLSX
_ = duktape.duk_eval_raw(ctx, "XLSX.write(workbook, {type:'array', bookType:'xlsx'})", 0, duktape.DUK_COMPILE_EVAL | duktape.DUK_COMPILE_NOSOURCE | duktape.DUK_COMPILE_STRLEN | duktape.DUK_COMPILE_NOFILENAME);
var sz: usize = 0;
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const c_ptr: *anyopaque = duktape.duk_get_buffer_data(ctx, -1, &sz).?;
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// generate zig slice from C pointer + length
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const slc: []u8 = @as([*]u8, @ptrCast(c_ptr))[0..sz];
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// write to file
_ = try std.fs.cwd().writeFile("sheetjs.zig.xlsx", slc);
}