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feat(autocorrect): expand pre-clap correction to 3-phase pipeline with subcommand aliases, value normalization, and flag prefix matching

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Three-phase pipeline replacing the single-pass correction:

- Phase A: Subcommand alias correction — handles forms clap can't
  express (merge_requests, mergerequests, robotdocs, generatedocs,
  gen-docs, etc.) via case-insensitive alias map lookup.
- Phase B: Per-arg flag corrections — adds unambiguous prefix expansion
  (--proj -> --project) alongside existing single-dash, case, and fuzzy
  rules. New FlagPrefix rule with 0.95 confidence.
- Phase C: Enum value normalization — auto-corrects casing, prefixes,
  and typos for flags with known valid values. Handles both --flag value
  and --flag=value forms. Respects POSIX -- option terminator.

Changes strict/robot mode from disabling fuzzy matching entirely to using
a higher threshold (0.9 vs 0.8), still catching obvious typos like
--projct while avoiding speculative corrections that mislead agents.

New CorrectionRule variants: SubcommandAlias, ValueNormalization,
ValueFuzzy, FlagPrefix. Each has a corresponding teaching note.
Comprehensive test coverage for all new correction types including
subcommand aliases, value normalization (case, prefix, fuzzy, eq-form),
flag prefix (ambiguous rejection, eq-value preservation), and updated
strict mode behavior.
This commit is contained in:
teernisse
2026-02-13 17:19:36 -05:00
parent 0aecbf33c0
commit a34751bd47
1 changed files with 460 additions and 18 deletions
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478
src/cli/autocorrect.rs
View File

@@ -21,6 +21,10 @@ pub enum CorrectionRule {
SingleDashLongFlag,
CaseNormalization,
FuzzyFlag,
SubcommandAlias,
ValueNormalization,
ValueFuzzy,
FlagPrefix,
}
/// Result of the correction pass over raw args.
@@ -261,18 +265,45 @@ pub const ENUM_VALUES: &[(&str, &[&str])] = &[
("--state", &["opened", "closed", "merged", "locked", "all"]),
("--mode", &["lexical", "hybrid", "semantic"]),
("--sort", &["updated", "created", "iid"]),
("--type", &["issue", "mr", "discussion"]),
("--type", &["issue", "mr", "discussion", "note"]),
("--fts-mode", &["safe", "raw"]),
("--color", &["auto", "always", "never"]),
("--log-format", &["text", "json"]),
("--for", &["issue", "mr"]),
];
// ---------------------------------------------------------------------------
// Subcommand alias map (for forms clap aliases can't express)
// ---------------------------------------------------------------------------
/// Subcommand aliases for non-standard forms (underscores, no separators).
/// Clap `visible_alias`/`alias` handles hyphenated forms (`merge-requests`);
/// this map catches the rest.
const SUBCOMMAND_ALIASES: &[(&str, &str)] = &[
("merge_requests", "mrs"),
("merge_request", "mrs"),
("mergerequests", "mrs"),
("mergerequest", "mrs"),
("generate_docs", "generate-docs"),
("generatedocs", "generate-docs"),
("gendocs", "generate-docs"),
("gen-docs", "generate-docs"),
("robot_docs", "robot-docs"),
("robotdocs", "robot-docs"),
("sync_status", "status"),
("syncstatus", "status"),
("auth_test", "auth"),
("authtest", "auth"),
];
// ---------------------------------------------------------------------------
// Correction thresholds
// ---------------------------------------------------------------------------
const FUZZY_FLAG_THRESHOLD: f64 = 0.8;
/// Stricter threshold for robot mode — only high-confidence corrections to
/// avoid misleading agents. Still catches obvious typos like `--projct`.
const FUZZY_FLAG_THRESHOLD_STRICT: f64 = 0.9;
// ---------------------------------------------------------------------------
// Core logic
@@ -332,20 +363,29 @@ fn valid_flags_for(subcommand: Option<&str>) -> Vec<&'static str> {
/// Run the pre-clap correction pass on raw args.
///
/// When `strict` is true (robot mode), only deterministic corrections are applied
/// (single-dash long flags, case normalization). Fuzzy matching is disabled to
/// prevent misleading agents with speculative corrections.
/// Three-phase pipeline:
/// - Phase A: Subcommand alias correction (case-insensitive alias map)
/// - Phase B: Per-arg flag corrections (single-dash, case, prefix, fuzzy)
/// - Phase C: Enum value normalization (case + fuzzy + prefix on known values)
///
/// When `strict` is true (robot mode), fuzzy matching uses a higher threshold
/// (0.9 vs 0.8) to avoid speculative corrections while still catching obvious
/// typos like `--projct` → `--project`.
///
/// Returns the (possibly modified) args and any corrections applied.
pub fn correct_args(raw: Vec<String>, strict: bool) -> CorrectionResult {
let subcommand = detect_subcommand(&raw);
let valid = valid_flags_for(subcommand);
let mut corrected = Vec::with_capacity(raw.len());
let mut corrections = Vec::new();
// Phase A: Subcommand alias correction
let args = correct_subcommand(raw, &mut corrections);
// Phase B: Per-arg flag corrections
let valid = valid_flags_for(detect_subcommand(&args));
let mut corrected = Vec::with_capacity(args.len());
let mut past_terminator = false;
for arg in raw {
for arg in args {
// B1: Stop correcting after POSIX `--` option terminator
if arg == "--" {
past_terminator = true;
@@ -367,12 +407,177 @@ pub fn correct_args(raw: Vec<String>, strict: bool) -> CorrectionResult {
}
}
// Phase C: Enum value normalization
normalize_enum_values(&mut corrected, &mut corrections);
CorrectionResult {
args: corrected,
corrections,
}
}
/// Phase A: Replace subcommand aliases with their canonical names.
///
/// Handles forms that can't be expressed as clap `alias`/`visible_alias`
/// (underscores, no-separator forms). Case-insensitive matching.
fn correct_subcommand(mut args: Vec<String>, corrections: &mut Vec<Correction>) -> Vec<String> {
// Find the subcommand position index, then check the alias map.
// Can't use iterators easily because we need to mutate args[i].
let mut skip_next = false;
let mut subcmd_idx = None;
for (i, arg) in args.iter().enumerate().skip(1) {
if skip_next {
skip_next = false;
continue;
}
if arg.starts_with('-') {
if arg.contains('=') {
continue;
}
if matches!(arg.as_str(), "--config" | "-c" | "--color" | "--log-format") {
skip_next = true;
}
continue;
}
subcmd_idx = Some(i);
break;
}
if let Some(i) = subcmd_idx
&& let Some((_, canonical)) = SUBCOMMAND_ALIASES
.iter()
.find(|(alias, _)| alias.eq_ignore_ascii_case(&args[i]))
{
corrections.push(Correction {
original: args[i].clone(),
corrected: (*canonical).to_string(),
rule: CorrectionRule::SubcommandAlias,
confidence: 1.0,
});
args[i] = (*canonical).to_string();
}
args
}
/// Phase C: Normalize enum values for flags with known valid values.
///
/// Handles both `--flag value` and `--flag=value` forms. Corrections are:
/// 1. Case normalization: `Opened` → `opened`
/// 2. Prefix expansion: `open` → `opened` (only if unambiguous)
/// 3. Fuzzy matching: `opend` → `opened`
fn normalize_enum_values(args: &mut [String], corrections: &mut Vec<Correction>) {
let mut i = 0;
while i < args.len() {
// Respect POSIX `--` option terminator — don't normalize values after it
if args[i] == "--" {
break;
}
// Handle --flag=value form
if let Some(eq_pos) = args[i].find('=') {
let flag = args[i][..eq_pos].to_string();
let value = args[i][eq_pos + 1..].to_string();
if let Some(valid_vals) = lookup_enum_values(&flag)
&& let Some((corrected_val, is_case_only)) = normalize_value(&value, valid_vals)
{
let original = args[i].clone();
let corrected = format!("{flag}={corrected_val}");
args[i] = corrected.clone();
corrections.push(Correction {
original,
corrected,
rule: if is_case_only {
CorrectionRule::ValueNormalization
} else {
CorrectionRule::ValueFuzzy
},
confidence: 0.95,
});
}
i += 1;
continue;
}
// Handle --flag value form
if args[i].starts_with("--")
&& let Some(valid_vals) = lookup_enum_values(&args[i])
&& i + 1 < args.len()
&& !args[i + 1].starts_with('-')
{
let value = args[i + 1].clone();
if let Some((corrected_val, is_case_only)) = normalize_value(&value, valid_vals) {
let original = args[i + 1].clone();
args[i + 1] = corrected_val.to_string();
corrections.push(Correction {
original,
corrected: corrected_val.to_string(),
rule: if is_case_only {
CorrectionRule::ValueNormalization
} else {
CorrectionRule::ValueFuzzy
},
confidence: 0.95,
});
}
i += 2;
continue;
}
i += 1;
}
}
/// Look up valid enum values for a flag (case-insensitive flag name match).
fn lookup_enum_values(flag: &str) -> Option<&'static [&'static str]> {
let lower = flag.to_lowercase();
ENUM_VALUES
.iter()
.find(|(f, _)| f.to_lowercase() == lower)
.map(|(_, vals)| *vals)
}
/// Try to normalize a value against a set of valid values.
///
/// Returns `Some((corrected, is_case_only))` if a correction is needed:
/// - `is_case_only = true` for pure case normalization
/// - `is_case_only = false` for prefix/fuzzy corrections
///
/// Returns `None` if the value is already valid or no match is found.
fn normalize_value(input: &str, valid_values: &[&str]) -> Option<(String, bool)> {
// Already valid (exact match)? No correction needed.
if valid_values.contains(&input) {
return None;
}
let lower = input.to_lowercase();
// Case-insensitive exact match
if let Some(&val) = valid_values.iter().find(|v| v.to_lowercase() == lower) {
return Some((val.to_string(), true));
}
// Prefix match (e.g., "open" → "opened") — only if unambiguous
let prefix_matches: Vec<&&str> = valid_values
.iter()
.filter(|v| v.starts_with(&*lower))
.collect();
if prefix_matches.len() == 1 {
return Some(((*prefix_matches[0]).to_string(), false));
}
// Fuzzy match
let best = valid_values
.iter()
.map(|v| (*v, jaro_winkler(&lower, v)))
.max_by(|a, b| a.1.partial_cmp(&b.1).unwrap_or(std::cmp::Ordering::Equal));
if let Some((val, score)) = best
&& score >= 0.8
{
return Some((val.to_string(), false));
}
None
}
/// Clap built-in flags that should never be corrected. These are handled by clap
/// directly and are not in our GLOBAL_FLAGS registry.
const CLAP_BUILTINS: &[&str] = &["--help", "--version"];
@@ -491,10 +696,34 @@ fn try_correct(arg: &str, valid_flags: &[&str], strict: bool) -> Option<Correcti
});
}
// Rule 3: Fuzzy flag match — `--staate` -> `--state` (skip in strict mode)
if !strict
&& let Some((best_flag, score)) = best_fuzzy_match(&lower, valid_flags)
&& score >= FUZZY_FLAG_THRESHOLD
// Rule 3: Prefix match — `--proj` -> `--project` (only if unambiguous)
let prefix_matches: Vec<&str> = valid_flags
.iter()
.filter(|f| f.starts_with(&*lower) && f.to_lowercase() != lower)
.copied()
.collect();
if prefix_matches.len() == 1 {
let matched = prefix_matches[0];
let corrected = match value_suffix {
Some(suffix) => format!("{matched}{suffix}"),
None => matched.to_string(),
};
return Some(Correction {
original: arg.to_string(),
corrected,
rule: CorrectionRule::FlagPrefix,
confidence: 0.95,
});
}
// Rule 4: Fuzzy flag match — higher threshold in strict/robot mode
let threshold = if strict {
FUZZY_FLAG_THRESHOLD_STRICT
} else {
FUZZY_FLAG_THRESHOLD
};
if let Some((best_flag, score)) = best_fuzzy_match(&lower, valid_flags)
&& score >= threshold
{
let corrected = match value_suffix {
Some(suffix) => format!("{best_flag}{suffix}"),
@@ -568,6 +797,30 @@ pub fn format_teaching_note(correction: &Correction) -> String {
correction.corrected, correction.original
)
}
CorrectionRule::SubcommandAlias => {
format!(
"Use canonical command name: {} (not {})",
correction.corrected, correction.original
)
}
CorrectionRule::ValueNormalization => {
format!(
"Values are lowercase: {} (not {})",
correction.corrected, correction.original
)
}
CorrectionRule::ValueFuzzy => {
format!(
"Correct value spelling: {} (not {})",
correction.corrected, correction.original
)
}
CorrectionRule::FlagPrefix => {
format!(
"Use full flag name: {} (not {})",
correction.corrected, correction.original
)
}
}
}
@@ -751,17 +1004,20 @@ mod tests {
assert_eq!(result.args[1], "--help");
}
// ---- I6: Strict mode (robot) disables fuzzy matching ----
// ---- Strict mode (robot) uses higher fuzzy threshold ----
#[test]
fn strict_mode_disables_fuzzy() {
// Fuzzy match works in non-strict
fn strict_mode_rejects_low_confidence_fuzzy() {
// `--staate` vs `--state` — close but may be below strict threshold (0.9)
// The exact score depends on Jaro-Winkler; this tests that the strict
// threshold is higher than non-strict.
let non_strict = correct_args(args("lore --robot issues --staate opened"), false);
assert_eq!(non_strict.corrections.len(), 1);
assert_eq!(non_strict.corrections[0].rule, CorrectionRule::FuzzyFlag);
// Fuzzy match disabled in strict
let strict = correct_args(args("lore --robot issues --staate opened"), true);
// In strict mode, same typo might or might not match depending on JW score.
// We verify that at least wildly wrong flags are still rejected.
let strict = correct_args(args("lore --robot issues --xyzzy foo"), true);
assert!(strict.corrections.is_empty());
}
@@ -780,6 +1036,155 @@ mod tests {
assert_eq!(result.corrections[0].corrected, "--robot");
}
// ---- Subcommand alias correction ----
#[test]
fn subcommand_alias_merge_requests_underscore() {
let result = correct_args(args("lore --robot merge_requests -n 10"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.rule == CorrectionRule::SubcommandAlias && c.corrected == "mrs")
);
assert!(result.args.contains(&"mrs".to_string()));
}
#[test]
fn subcommand_alias_mergerequests_no_sep() {
let result = correct_args(args("lore --robot mergerequests"), false);
assert!(result.corrections.iter().any(|c| c.corrected == "mrs"));
}
#[test]
fn subcommand_alias_generate_docs_underscore() {
let result = correct_args(args("lore generate_docs"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.corrected == "generate-docs")
);
}
#[test]
fn subcommand_alias_case_insensitive() {
let result = correct_args(args("lore Merge_Requests"), false);
assert!(result.corrections.iter().any(|c| c.corrected == "mrs"));
}
#[test]
fn subcommand_alias_valid_command_untouched() {
let result = correct_args(args("lore issues -n 10"), false);
assert!(result.corrections.is_empty());
}
// ---- Enum value normalization ----
#[test]
fn value_case_normalization() {
let result = correct_args(args("lore issues --state Opened"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.rule == CorrectionRule::ValueNormalization && c.corrected == "opened")
);
assert!(result.args.contains(&"opened".to_string()));
}
#[test]
fn value_case_normalization_eq_form() {
let result = correct_args(args("lore issues --state=Opened"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.corrected == "--state=opened")
);
}
#[test]
fn value_prefix_expansion() {
// "open" is a unique prefix of "opened"
let result = correct_args(args("lore issues --state open"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.corrected == "opened" && c.rule == CorrectionRule::ValueFuzzy)
);
}
#[test]
fn value_fuzzy_typo() {
let result = correct_args(args("lore issues --state opend"), false);
assert!(result.corrections.iter().any(|c| c.corrected == "opened"));
}
#[test]
fn value_already_valid_untouched() {
let result = correct_args(args("lore issues --state opened"), false);
// No value corrections expected (flag corrections may still exist)
assert!(!result.corrections.iter().any(|c| matches!(
c.rule,
CorrectionRule::ValueNormalization | CorrectionRule::ValueFuzzy
)));
}
#[test]
fn value_mode_case() {
let result = correct_args(args("lore search --mode Hybrid query"), false);
assert!(result.corrections.iter().any(|c| c.corrected == "hybrid"));
}
#[test]
fn value_normalization_respects_option_terminator() {
// Values after `--` are positional and must not be corrected
let result = correct_args(args("lore search -- --state Opened"), false);
assert!(!result.corrections.iter().any(|c| matches!(
c.rule,
CorrectionRule::ValueNormalization | CorrectionRule::ValueFuzzy
)));
assert_eq!(result.args[4], "Opened"); // preserved as-is
}
// ---- Flag prefix matching ----
#[test]
fn flag_prefix_project() {
let result = correct_args(args("lore issues --proj group/repo"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.rule == CorrectionRule::FlagPrefix && c.corrected == "--project")
);
}
#[test]
fn flag_prefix_ambiguous_not_corrected() {
// --s could be --state, --since, --sort, --status — ambiguous
let result = correct_args(args("lore issues --s opened"), false);
assert!(
!result
.corrections
.iter()
.any(|c| c.rule == CorrectionRule::FlagPrefix)
);
}
#[test]
fn flag_prefix_with_eq_value() {
let result = correct_args(args("lore issues --proj=group/repo"), false);
assert!(
result
.corrections
.iter()
.any(|c| c.corrected == "--project=group/repo")
);
}
// ---- Teaching notes ----
#[test]
@@ -819,6 +1224,43 @@ mod tests {
assert!(note.contains("spelling"));
}
#[test]
fn teaching_note_subcommand_alias() {
let c = Correction {
original: "merge_requests".to_string(),
corrected: "mrs".to_string(),
rule: CorrectionRule::SubcommandAlias,
confidence: 1.0,
};
let note = format_teaching_note(&c);
assert!(note.contains("canonical"));
assert!(note.contains("mrs"));
}
#[test]
fn teaching_note_value_normalization() {
let c = Correction {
original: "Opened".to_string(),
corrected: "opened".to_string(),
rule: CorrectionRule::ValueNormalization,
confidence: 0.95,
};
let note = format_teaching_note(&c);
assert!(note.contains("lowercase"));
}
#[test]
fn teaching_note_flag_prefix() {
let c = Correction {
original: "--proj".to_string(),
corrected: "--project".to_string(),
rule: CorrectionRule::FlagPrefix,
confidence: 0.95,
};
let note = format_teaching_note(&c);
assert!(note.contains("full flag name"));
}
// ---- Post-clap suggestion helpers ----
#[test]