1 // Copyright 2020 The Tint Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 #include <unistd.h>
16
17 #include <cstring>
18
19 #include "src/diagnostic/printer.h"
20
21 namespace tint {
22 namespace diag {
23 namespace {
24
supports_colors(FILE * f)25 bool supports_colors(FILE* f) {
26 if (!isatty(fileno(f))) {
27 return false;
28 }
29
30 const char* cterm = getenv("TERM");
31 if (cterm == nullptr) {
32 return false;
33 }
34
35 std::string term = getenv("TERM");
36 if (term != "cygwin" && term != "linux" && term != "rxvt-unicode-256color" &&
37 term != "rxvt-unicode" && term != "screen-256color" && term != "screen" &&
38 term != "tmux-256color" && term != "tmux" && term != "xterm-256color" &&
39 term != "xterm-color" && term != "xterm") {
40 return false;
41 }
42
43 return true;
44 }
45
46 class PrinterLinux : public Printer {
47 public:
PrinterLinux(FILE * f,bool colors)48 PrinterLinux(FILE* f, bool colors)
49 : file(f), use_colors(colors && supports_colors(f)) {}
50
write(const std::string & str,const Style & style)51 void write(const std::string& str, const Style& style) override {
52 write_color(style.color, style.bold);
53 fwrite(str.data(), 1, str.size(), file);
54 write_color(Color::kDefault, false);
55 }
56
57 private:
color_code(Color color,bool bold)58 constexpr const char* color_code(Color color, bool bold) {
59 switch (color) {
60 case Color::kDefault:
61 return bold ? "\u001b[1m" : "\u001b[0m";
62 case Color::kBlack:
63 return bold ? "\u001b[30;1m" : "\u001b[30m";
64 case Color::kRed:
65 return bold ? "\u001b[31;1m" : "\u001b[31m";
66 case Color::kGreen:
67 return bold ? "\u001b[32;1m" : "\u001b[32m";
68 case Color::kYellow:
69 return bold ? "\u001b[33;1m" : "\u001b[33m";
70 case Color::kBlue:
71 return bold ? "\u001b[34;1m" : "\u001b[34m";
72 case Color::kMagenta:
73 return bold ? "\u001b[35;1m" : "\u001b[35m";
74 case Color::kCyan:
75 return bold ? "\u001b[36;1m" : "\u001b[36m";
76 case Color::kWhite:
77 return bold ? "\u001b[37;1m" : "\u001b[37m";
78 }
79 return ""; // unreachable
80 }
81
write_color(Color color,bool bold)82 void write_color(Color color, bool bold) {
83 if (use_colors) {
84 auto* code = color_code(color, bold);
85 fwrite(code, 1, strlen(code), file);
86 }
87 }
88
89 FILE* const file;
90 bool const use_colors;
91 };
92
93 } // namespace
94
create(FILE * out,bool use_colors)95 std::unique_ptr<Printer> Printer::create(FILE* out, bool use_colors) {
96 return std::make_unique<PrinterLinux>(out, use_colors);
97 }
98
99 } // namespace diag
100 } // namespace tint
101