mirror of
https://github.com/kanaka/mal.git
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51 lines
1.4 KiB
Zig
51 lines
1.4 KiB
Zig
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const Allocator = @import("std").mem.Allocator;
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const readline = @cImport(
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@cInclude("readline/readline.h"));
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const rl_hist = @cImport(
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@cInclude("readline/history.h"));
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const free = @import("std").c.free;
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const addNullByte = @import("std").cstr.addNullByte;
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const warn = @import("std").debug.warn;
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pub fn slice_from_cstr(allocator: *Allocator, str: [*]const u8) ![]u8{
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var length: usize = 0;
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while(true) {
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if(str[length] == 0)
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break;
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length += 1;
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}
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// TODO: check for 0-length
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const slice = try allocator.alloc(u8, length);
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var i: usize = 0;
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while(i < length) {
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slice[i] = str[i];
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i += 1;
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}
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return slice;
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}
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pub fn getline(allocator: *Allocator) !?[] u8 {
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var input: ?[*] u8 = readline.readline(c"user> ");
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if(input) |actual| {
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const aslice = try slice_from_cstr(allocator, actual);
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rl_hist.add_history(actual);
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free(actual);
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return aslice;
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}
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return null;
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}
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pub fn getline_prompt(allocator: *Allocator, prompt: []const u8) !?[] u8 {
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const null_terminated_prompt = try addNullByte(allocator, prompt);
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var input: ?[*] u8 = readline.readline(&null_terminated_prompt[0]);
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allocator.free(null_terminated_prompt);
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if(input) |actual| {
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const aslice = try slice_from_cstr(allocator, actual);
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rl_hist.add_history(actual);
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free(actual);
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return aslice;
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}
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return null;
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}
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