284 lines
11 KiB
Zig
284 lines
11 KiB
Zig
const std = @import("std");
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const clap = @import("clap");
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const syntax = @import("syntax");
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const Theme = @import("theme");
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const themes = @import("themes");
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const term = @import("ansi-term.zig");
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const config_loader = @import("config_loader.zig");
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const StyleCache = std.AutoHashMap(u32, ?Theme.Token);
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var style_cache: StyleCache = undefined;
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var lang_override: ?[]const u8 = null;
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var lang_default: []const u8 = "conf";
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pub fn main() !void {
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const params = comptime clap.parseParamsComptime(
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\\-h, --help Display this help and exit.
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\\-l, --language <str> Override the language.
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\\-t, --theme <str> Select theme to use.
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\\-d, --default <str> Set the language to use if guessing failed (default: conf).
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\\-s, --show-language Show detected language in output.
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\\--list-themes Show available themes.
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\\--list-languages Show available language parsers.
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\\<str>... File to open.
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\\
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);
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var gpa: std.heap.GeneralPurposeAllocator(.{}) = .{};
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const a = gpa.allocator();
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style_cache = StyleCache.init(a);
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var diag = clap.Diagnostic{};
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var res = clap.parse(clap.Help, ¶ms, clap.parsers.default, .{
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.diagnostic = &diag,
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.allocator = a,
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}) catch |err| {
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diag.report(std.io.getStdErr().writer(), err) catch {};
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clap.help(std.io.getStdErr().writer(), clap.Help, ¶ms, .{}) catch {};
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std.os.exit(1);
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return err;
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};
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defer res.deinit();
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if (res.args.help != 0)
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return clap.help(std.io.getStdErr().writer(), clap.Help, ¶ms, .{});
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if (res.args.@"list-themes" != 0)
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return list_themes(std.io.getStdOut().writer());
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if (res.args.@"list-languages" != 0)
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return list_langs(std.io.getStdOut().writer());
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var conf_buf: ?[]const u8 = null;
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const conf = config_loader.read_config(a, &conf_buf);
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const theme_name = if (res.args.theme) |theme| theme else conf.theme;
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const theme = get_theme_by_name(theme_name) orelse {
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try std.io.getStdErr().writer().print("theme \"{s}\" not found\n", .{theme_name});
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std.os.exit(1);
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};
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lang_override = res.args.language;
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if (res.args.default) |default| lang_default = default;
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const stdout_file = std.io.getStdOut().writer();
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var bw = std.io.bufferedWriter(stdout_file);
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const writer = bw.writer();
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if (res.positionals.len > 0) {
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for (res.positionals) |arg| {
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const file = try std.fs.cwd().openFile(arg, .{ .mode = .read_only });
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defer file.close();
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const content = try file.readToEndAlloc(a, std.math.maxInt(u32));
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defer a.free(content);
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render_file(a, writer, content, arg, &theme, res.args.@"show-language" != 0) catch |e| switch (e) {
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error.Stop => return,
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else => return e,
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};
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try bw.flush();
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}
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} else {
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const content = try std.io.getStdIn().readToEndAlloc(a, std.math.maxInt(u32));
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defer a.free(content);
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render_file(a, writer, content, "-", &theme, res.args.@"show-language" != 0) catch |e| switch (e) {
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error.Stop => return,
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else => return e,
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};
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}
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try bw.flush();
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}
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fn get_parser(a: std.mem.Allocator, content: []const u8, file_path: []const u8) *syntax {
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return (if (lang_override) |name|
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syntax.create_file_type(a, content, name) catch unknown_file_type(name)
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else
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syntax.create_guess_file_type(a, content, file_path)) catch syntax.create_file_type(a, content, lang_default) catch unknown_file_type(lang_default);
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}
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fn unknown_file_type(name: []const u8) noreturn {
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std.io.getStdErr().writer().print("unknown file type \'{s}\'\n", .{name}) catch {};
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std.os.exit(1);
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}
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fn render_file(a: std.mem.Allocator, writer: anytype, content: []const u8, file_path: []const u8, theme: *const Theme, show: bool) !void {
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const parser = get_parser(a, content, file_path);
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if (show) try render_file_type(writer, parser.file_type, theme);
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const Ctx = struct {
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writer: @TypeOf(writer),
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content: []const u8,
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theme: *const Theme,
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last_pos: usize = 0,
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fn cb(ctx: *@This(), range: syntax.Range, scope: []const u8, id: u32, idx: usize, _: *const syntax.Node) error{Stop}!void {
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if (idx > 0) return;
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if (ctx.last_pos < range.start_byte) {
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ctx.writer.writeAll(ctx.content[ctx.last_pos..range.start_byte]) catch return error.Stop;
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ctx.last_pos = range.start_byte;
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}
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if (range.start_byte < ctx.last_pos) return;
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const plain: Theme.Style = Theme.Style{ .fg = ctx.theme.editor.fg };
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if (style_cache_lookup(ctx.theme, scope, id)) |token| {
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set_ansi_style(ctx.writer, token.style, plain) catch return error.Stop;
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ctx.writer.writeAll(ctx.content[range.start_byte..range.end_byte]) catch return error.Stop;
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set_ansi_style(ctx.writer, plain, plain) catch return error.Stop;
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} else {
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ctx.writer.writeAll(ctx.content[range.start_byte..range.end_byte]) catch return error.Stop;
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}
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ctx.last_pos = range.end_byte;
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}
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};
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var ctx: Ctx = .{ .writer = writer, .content = content, .theme = theme };
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try parser.render(&ctx, Ctx.cb, null);
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try ctx.writer.writeAll(content[ctx.last_pos..]);
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}
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fn style_cache_lookup(theme: *const Theme, scope: []const u8, id: u32) ?Theme.Token {
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return if (style_cache.get(id)) |sty| ret: {
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break :ret sty;
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} else ret: {
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const sty = find_scope_style(theme, scope) orelse null;
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style_cache.put(id, sty) catch {};
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break :ret sty;
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};
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}
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fn find_scope_style(theme: *const Theme, scope: []const u8) ?Theme.Token {
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return if (find_scope_fallback(scope)) |tm_scope|
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find_scope_style_nofallback(theme, tm_scope) orelse find_scope_style_nofallback(theme, scope)
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else
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find_scope_style_nofallback(theme, scope);
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}
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fn find_scope_style_nofallback(theme: *const Theme, scope: []const u8) ?Theme.Token {
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var idx = theme.tokens.len - 1;
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var done = false;
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while (!done) : (if (idx == 0) {
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done = true;
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} else {
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idx -= 1;
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}) {
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const token = theme.tokens[idx];
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const name = themes.scopes[token.id];
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if (name.len > scope.len)
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continue;
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if (std.mem.eql(u8, name, scope[0..name.len]))
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return token;
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}
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return null;
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}
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fn find_scope_fallback(scope: []const u8) ?[]const u8 {
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for (fallbacks) |fallback| {
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if (fallback.ts.len > scope.len)
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continue;
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if (std.mem.eql(u8, fallback.ts, scope[0..fallback.ts.len]))
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return fallback.tm;
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}
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return null;
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}
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pub const FallBack = struct { ts: []const u8, tm: []const u8 };
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pub const fallbacks: []const FallBack = &[_]FallBack{
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.{ .ts = "namespace", .tm = "entity.name.namespace" },
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.{ .ts = "type", .tm = "entity.name.type" },
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.{ .ts = "type.defaultLibrary", .tm = "support.type" },
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.{ .ts = "struct", .tm = "storage.type.struct" },
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.{ .ts = "class", .tm = "entity.name.type.class" },
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.{ .ts = "class.defaultLibrary", .tm = "support.class" },
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.{ .ts = "interface", .tm = "entity.name.type.interface" },
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.{ .ts = "enum", .tm = "entity.name.type.enum" },
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.{ .ts = "function", .tm = "entity.name.function" },
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.{ .ts = "function.defaultLibrary", .tm = "support.function" },
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.{ .ts = "method", .tm = "entity.name.function.member" },
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.{ .ts = "macro", .tm = "entity.name.function.macro" },
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.{ .ts = "variable", .tm = "variable.other.readwrite , entity.name.variable" },
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.{ .ts = "variable.readonly", .tm = "variable.other.constant" },
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.{ .ts = "variable.readonly.defaultLibrary", .tm = "support.constant" },
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.{ .ts = "parameter", .tm = "variable.parameter" },
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.{ .ts = "property", .tm = "variable.other.property" },
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.{ .ts = "property.readonly", .tm = "variable.other.constant.property" },
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.{ .ts = "enumMember", .tm = "variable.other.enummember" },
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.{ .ts = "event", .tm = "variable.other.event" },
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// zig
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.{ .ts = "attribute", .tm = "keyword" },
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.{ .ts = "number", .tm = "constant.numeric" },
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.{ .ts = "conditional", .tm = "keyword.control.conditional" },
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.{ .ts = "operator", .tm = "keyword.operator" },
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.{ .ts = "boolean", .tm = "keyword.constant.bool" },
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.{ .ts = "string", .tm = "string.quoted" },
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.{ .ts = "repeat", .tm = "keyword.control.flow" },
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.{ .ts = "field", .tm = "variable" },
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};
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fn get_theme_by_name(name: []const u8) ?Theme {
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for (themes.themes) |theme| {
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if (std.mem.eql(u8, theme.name, name))
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return theme;
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}
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return null;
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}
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fn list_themes(writer: anytype) !void {
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var max_name_len: usize = 0;
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for (themes.themes) |theme|
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max_name_len = @max(max_name_len, theme.name.len);
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for (themes.themes) |theme| {
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try writer.writeAll(theme.name);
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try writer.writeByteNTimes(' ', max_name_len + 2 - theme.name.len);
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try writer.writeAll(theme.description);
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try writer.writeAll("\n");
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}
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}
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fn set_ansi_style(writer: anytype, style: Theme.Style, fallback: Theme.Style) !void {
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const ansi_style = .{
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.foreground = if (style.fg) |color| to_rgb_color(color) else if (fallback.fg) |color| to_rgb_color(color) else .Default,
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.background = if (style.bg) |color| to_rgb_color(color) else if (fallback.bg) |color| to_rgb_color(color) else .Default,
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.font_style = switch (style.fs orelse .normal) {
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.normal => term.style.FontStyle{},
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.bold => term.style.FontStyle.bold,
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.italic => term.style.FontStyle.italic,
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.underline => term.style.FontStyle.underline,
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.strikethrough => term.style.FontStyle.crossedout,
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},
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};
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try term.format.updateStyle(writer, ansi_style, null);
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}
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fn to_rgb_color(color: u24) term.style.Color {
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const r = @as(u8, @intCast(color >> 16 & 0xFF));
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const g = @as(u8, @intCast(color >> 8 & 0xFF));
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const b = @as(u8, @intCast(color & 0xFF));
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return .{ .RGB = .{ .r = r, .g = g, .b = b } };
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}
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fn list_langs(writer: anytype) !void {
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for (syntax.FileType.file_types) |file_type| {
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try writer.writeAll(file_type.name);
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try writer.writeAll("\n");
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}
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}
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fn render_file_type(writer: anytype, file_type: *const syntax.FileType, theme: *const Theme) !void {
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const style = theme.editor_selection;
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const reversed = Theme.Style{ .fg = theme.editor_selection.bg };
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const plain: Theme.Style = Theme.Style{ .fg = theme.editor.fg };
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try set_ansi_style(writer, reversed, plain);
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try writer.writeAll("");
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try set_ansi_style(writer, .{
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.fg = if (file_type.color == 0xFFFFFF or file_type.color == 0x000000) style.fg else file_type.color,
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.bg = style.bg,
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}, plain);
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try writer.writeAll(file_type.icon);
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try writer.writeAll(" ");
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try set_ansi_style(writer, style, plain);
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try writer.writeAll(file_type.name);
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try set_ansi_style(writer, reversed, plain);
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try writer.writeAll("");
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try set_ansi_style(writer, plain, plain);
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try writer.writeAll("\n");
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}
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