1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
use std::cmp::Ordering;
use camino::Utf8PathBuf;
const NAME: &str = env!("CARGO_PKG_NAME");
const VERSION: &str = env!("CARGO_PKG_VERSION");
const AUTHORS: &str = env!("CARGO_PKG_AUTHORS");
pub struct Cli {
pub color_count: u8,
pub tolerance: Option<f32>,
pub difference: DifferenceFn,
pub input: Utf8PathBuf,
pub in_type: InType,
pub output: Utf8PathBuf,
pub out_type: OutType,
}
// It's not a builder, but I think the builder/building name is useful
// here because it's used while not all things are populated.
#[derive(Debug, Default)]
struct BuildingCli {
pub color_count: Option<u8>,
pub tolerance: Option<f32>,
pub difference: DifferenceFn,
}
impl BuildingCli {
// One minus max
const DEFAULT_COLORS: u8 = 255;
pub fn build_or_die(self, input: &str, output: &str) -> Cli {
let input: Utf8PathBuf = input.into();
let in_type = match input.extension() {
None => {
eprintln!("can't determine input filetype!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
Some("png") => InType::Png,
Some("jpg") | Some("jpeg") => InType::Jpeg,
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupported input types: PNG, JPG");
std::process::exit(1);
}
};
let output: Utf8PathBuf = output.into();
let out_type = match output.extension() {
None => {
eprintln!("can't determine output filetype!");
std::process::exit(1);
}
Some("png") => OutType::Png,
Some("gif") => OutType::Gif,
Some(ext) => {
eprintln!("unknown filetype '{ext}'!\nSupport output types are: GIF, PNG");
std::process::exit(1);
}
};
Cli {
color_count: self.color_count.unwrap_or(Self::DEFAULT_COLORS),
tolerance: self.tolerance,
difference: self.difference,
input,
in_type,
output,
out_type,
}
}
}
pub enum InType {
Jpeg,
Png,
}
pub enum OutType {
Png,
Gif,
}
#[derive(Debug, Default)]
pub enum DifferenceFn {
#[default]
Rgb,
Redmean,
}
pub fn build() -> Cli {
let mut free = vec![];
let mut building = BuildingCli::default();
for arg in std::env::args().skip(1) {
// Handle the special cases we want to obey.
// -h/--help are standards and, even though we're playing with a
// dd-style syntax, we want to respect these.
// we'll do -V/--version
if arg == "-h" || arg == "--help" {
print_help()
} else if arg == "-V" || arg == "--version" {
print_version()
}
match arg.split_once('=') {
None => free.push(arg),
Some(("colors", value)) | Some(("colours", value)) | Some(("clrs", value)) => {
match value.parse::<usize>() {
Err(_) => {
eprintln!("color must be a whole number > 0 and <= 256");
std::process::exit(1);
}
Ok(count) if count == 0 || count > 256 => {
eprintln!("color must be a whole number >= 1 and <= 256");
std::process::exit(1);
}
Ok(count) => {
//TODO: error if this's been set already?
building.color_count = Some((count - 1) as u8);
}
}
}
Some(("tolerance", value)) | Some(("tol", value)) => match value.parse::<f32>() {
Err(_) => {
eprintln!("tolerance must be > 0.0 and <= 100.0");
std::process::exit(1);
}
Ok(tol) if tol <= 0.0 || tol > 100.0 => {
eprintln!("tolerance must be > 0.0 and <= 100.0");
std::process::exit(1);
}
Ok(tol) => {
//TODO: error if this's been set already
building.tolerance = Some(tol);
}
},
Some(("difference", algo)) | Some(("dif", algo)) => match algo {
"rgb" => building.difference = DifferenceFn::Rgb,
"redmean" => building.difference = DifferenceFn::Redmean,
_ => {
eprintln!("'{algo}' is not recognized as an algorithm. See help=algorithms");
std::process::exit(1);
}
},
Some(("help", "algorithms")) => print_help_algorithms(),
Some(("help", _)) => print_help(),
Some(("version", _)) => print_version(),
Some((key, _)) => {
eprintln!("unrecognised key {key}");
std::process::exit(1);
}
}
}
match free.len().cmp(&2) {
Ordering::Less => {
eprintln!("didn't get enough arguments! 'help=' for help");
std::process::exit(1);
}
Ordering::Greater => {
eprintln!("got too many arguments! 'help=' for help");
std::process::exit(1);
}
Ordering::Equal => building.build_or_die(&free[0], &free[1]),
}
}
fn print_help() -> ! {
println!("usage: {NAME} [arguments ...] <input> <output>\n");
println!("<input> path to a jpeg or png file");
println!("<output> path to write a png or gif file to\n");
println!("ARGUMENTS:");
println!(" colors=<int> | clrs=<int>");
println!(" the number of colours the final image should contain");
println!(" a whole number more than 0 and less than, or equal, 256");
println!(" [Default 256]\n");
println!(" difference=<algorithm> | did=<algorithm>");
println!(" the color comparison function to use. one of: rgb, redmean");
println!(" for more details use help=algorithms. [Default rgb]");
println!(" tolerance=<float> | tol=<float>");
println!(" how different colours should be to be added to the palette");
println!(" a number > 0 and <= 100\n");
println!(" help= | -h | --help");
println!(" print this message and exit\n");
println!(" version= | -V | --version");
println!(" print the version and authors and exit");
std::process::exit(0)
}
fn print_help_algorithms() -> ! {
println!("ALGORITHMS");
println!("rgb:");
println!(" a straight, rather naïve, RGB comparison. It sums the channel");
println!(" differences. This is it, really:");
println!(" |a.red - b.red| + |a.green - b.green| + |a.blue - b.blue|\n");
println!("redmean:");
println!(" a slightly more intelligent algorithm that weighs the channels");
println!(" in an attempt to more better align with human color perception.");
std::process::exit(0)
}
fn print_version() -> ! {
println!("squash version {VERSION}");
println!("written by {AUTHORS}");
std::process::exit(0)
}
|
