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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
|
use syn::Item;
use crate::pattern_analyzer::{AnalyzeItem, AnalyzePattern};
/// Match structs annotated with `#[dispatcher_clap(...)]`, extracting:
/// - The entry type (struct name, always)
/// - The dispatcher struct (`CMD*`, always)
/// - The error type, if `error = ErrorType` is specified
/// - The help internal struct, if `help = true` is specified
/// - `__internal_dispatcher_*` — dispatch tree static (when `use_dispatch_tree` is true)
///
/// Covers forms:
/// - `#[dispatcher_clap("greet", CMDGreet)] struct EntryGreet { ... }`
/// - `#[dispatcher_clap("greet", CMDGreet, error = ErrorGreet)] struct EntryGreet { ... }`
/// - `#[dispatcher_clap("greet", CMDGreet, help = true)] struct EntryGreet { ... }`
/// - `#[dispatcher_clap("greet", CMDGreet, error = ErrorGreet, help = true)] struct EntryGreet { ... }`
pub struct DispatcherClapPattern {
pub use_dispatch_tree: bool,
}
impl DispatcherClapPattern {
pub fn new(use_dispatch_tree: bool) -> Self {
Self { use_dispatch_tree }
}
}
impl AnalyzePattern for DispatcherClapPattern {
fn contains(&self, content: &str) -> bool {
content.contains("dispatcher_clap(")
}
fn analyze(&self, content: &str) -> Vec<AnalyzeItem> {
let Ok(syntax) = syn::parse_file(content) else {
return Vec::new();
};
let mut items = Vec::new();
for item in &syntax.items {
match item {
Item::Struct(s) if has_attr(&s.attrs, "dispatcher_clap") => {
// Entry type (struct name) — always
let entry_name = s.ident.to_string();
items.push(AnalyzeItem {
module: String::new(),
item_name: entry_name.clone(),
});
// Parse the attribute to extract CMD, error, and help info
if let Some(attr) = s.attrs.iter().find(|a| {
a.path()
.segments
.last()
.is_some_and(|seg| seg.ident == "dispatcher_clap")
}) {
let args = attr.meta.require_list().ok();
let args_str = args.map(|l| l.tokens.to_string()).unwrap_or_default();
let parsed = parse_dispatcher_clap_args(&args_str);
// CMD type — always
if let Some(ref cmd) = parsed.cmd_type {
items.push(AnalyzeItem {
module: String::new(),
item_name: cmd.clone(),
});
}
// Error type — if error = TypeName
if let Some(ref err) = parsed.error_type {
items.push(AnalyzeItem {
module: String::new(),
item_name: err.clone(),
});
}
// Help internal struct — if help = true
if parsed.help_enabled
&& let Some(ref cmd) = parsed.cmd_type
{
let help_fn = format!("__{}_help", just_fmt::snake_case!(cmd));
let help_struct =
format!("__internal_help_{}", just_fmt::snake_case!(&help_fn));
items.push(AnalyzeItem {
module: String::new(),
item_name: help_struct,
});
}
// __internal_dispatcher_* — when configured
if self.use_dispatch_tree
&& let Some(ref cmd_name) = parsed.cmd_name
{
let internal_name = format!(
"__internal_dispatcher_{}",
just_fmt::snake_case!(cmd_name)
);
items.push(AnalyzeItem {
module: String::new(),
item_name: internal_name,
});
}
}
}
Item::Mod(item_mod) => {
if let Some((_, nested)) = &item_mod.content {
for n in nested {
if let Item::Struct(s) = n
&& has_attr(&s.attrs, "dispatcher_clap")
{
let entry_name = s.ident.to_string();
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: entry_name.clone(),
});
if let Some(attr) = s.attrs.iter().find(|a| {
a.path()
.segments
.last()
.is_some_and(|seg| seg.ident == "dispatcher_clap")
}) {
let args = attr.meta.require_list().ok();
let args_str =
args.map(|l| l.tokens.to_string()).unwrap_or_default();
let parsed = parse_dispatcher_clap_args(&args_str);
if let Some(ref cmd) = parsed.cmd_type {
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: cmd.clone(),
});
}
if let Some(ref err) = parsed.error_type {
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: err.clone(),
});
}
// Help internal struct — same naming rule as root level
if parsed.help_enabled
&& let Some(ref cmd) = parsed.cmd_type
{
let help_fn =
format!("__{}_help", just_fmt::snake_case!(cmd));
let help_struct = format!(
"__internal_help_{}",
just_fmt::snake_case!(&help_fn)
);
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: help_struct,
});
}
// __internal_dispatcher_* — when configured
if self.use_dispatch_tree
&& let Some(ref cmd_name) = parsed.cmd_name
{
let internal_name = format!(
"__internal_dispatcher_{}",
just_fmt::snake_case!(cmd_name)
);
items.push(AnalyzeItem {
module: item_mod.ident.to_string(),
item_name: internal_name,
});
}
}
}
}
}
}
_ => {}
}
}
items
}
}
struct ParsedClapArgs {
cmd_name: Option<String>,
cmd_type: Option<String>,
error_type: Option<String>,
help_enabled: bool,
}
/// Parse `#[dispatcher_clap("cmd", CMDType, error = ErrorType, help = true)]` arguments.
fn parse_dispatcher_clap_args(args: &str) -> ParsedClapArgs {
let mut cmd_name = None;
let mut cmd_type = None;
let mut error_type = None;
let mut help_enabled = false;
let args = args.trim();
// Extract the first quoted string (the command name)
let after_cmd = if let Some(start) = args.find('"') {
let after_open = &args[start + 1..];
if let Some(end) = after_open.find('"') {
cmd_name = Some(after_open[..end].to_string());
after_open[end + 1..].trim()
} else {
args
}
} else {
args
};
// Split by commas and parse each part
for part in after_cmd.split(',') {
let part = part.trim();
if part.is_empty() {
continue;
}
// Skip the command name (first quoted string should already be removed)
if part.starts_with('"') {
continue;
}
// Check for key = value
if let Some(eq_idx) = part.find('=') {
let key = part[..eq_idx].trim();
let value = part[eq_idx + 1..].trim();
let value = value.trim_end_matches([')', ']']).trim();
match key {
"error" => {
error_type = Some(value.to_string());
}
"help" => {
help_enabled = value == "true";
}
_ => {}
}
} else {
// Bare ident — the CMD type
let clean = part.trim_end_matches([')', ']']).trim();
if !clean.is_empty() && cmd_type.is_none() {
cmd_type = Some(clean.to_string());
}
}
}
ParsedClapArgs {
cmd_name,
cmd_type,
error_type,
help_enabled,
}
}
fn has_attr(attrs: &[syn::Attribute], name: &str) -> bool {
attrs
.iter()
.any(|a| a.path().segments.last().is_some_and(|s| s.ident == name))
}
|
