diff --git a/src/app/parser.rs b/src/app/parser.rs index 6153e274..1288f7e1 100644 --- a/src/app/parser.rs +++ b/src/app/parser.rs @@ -1,5 +1,4 @@ // Std -use std::collections::{BTreeMap, VecDeque}; use std::ffi::{OsStr, OsString}; use std::fmt::Display; use std::fs::File; @@ -119,33 +118,44 @@ impl<'a, 'b> Parser<'a, 'b> } #[inline] - fn debug_asserts(&self, a: &Arg) { - debug_assert!(!arg_names!(self).any(|name| name == a.b.name), - format!("Non-unique argument name: {} is already in use", a.b.name)); + fn debug_asserts(&self, a: &Arg) -> bool { + assert!(!arg_names!(self).any(|name| name == a.b.name), + format!("Non-unique argument name: {} is already in use", a.b.name)); if let Some(l) = a.s.long { - debug_assert!(!self.contains_long(l), - format!("Argument long must be unique\n\n\t--{} is already in use", - l)); + assert!(!self.contains_long(l), + "Argument long must be unique\n\n\t--{} is already in use", + l); } if let Some(s) = a.s.short { - debug_assert!(!self.contains_short(s), - format!("Argument short must be unique\n\n\t-{} is already in use", - s)); + assert!(!self.contains_short(s), + "Argument short must be unique\n\n\t-{} is already in use", + s); } let i = if a.index.is_none() { (self.positionals.len() + 1) } else { a.index.unwrap() as usize }; - debug_assert!(!self.positionals.contains_key(i), - format!("Argument \"{}\" has the same index as another positional \ + assert!(!self.positionals.contains_key(i), + "Argument \"{}\" has the same index as another positional \ argument\n\n\tPerhaps try .multiple(true) to allow one positional argument \ to take multiple values", - a.b.name)); - debug_assert!(!(a.is_set(ArgSettings::Required) && a.is_set(ArgSettings::Global)), - format!("Global arguments cannot be required.\n\n\t'{}' is marked as \ + a.b.name); + assert!(!(a.is_set(ArgSettings::Required) && a.is_set(ArgSettings::Global)), + "Global arguments cannot be required.\n\n\t'{}' is marked as \ global and required", - a.b.name)); + a.b.name); + if a.b.is_set(ArgSettings::Last) { + assert!(!self.positionals.values().any(|p| p.b.is_set(ArgSettings::Last)), + "Only one positional argument may have last(true) set. Found two."); + assert!(a.s.long.is_none(), + "Flags or Options may not have last(true) set. {} has both a long and last(true) set.", + a.b.name); + assert!(a.s.short.is_none(), + "Flags or Options may not have last(true) set. {} has both a short and last(true) set.", + a.b.name); + } + true } #[inline] @@ -188,16 +198,27 @@ impl<'a, 'b> Parser<'a, 'b> } } + #[inline] + fn implied_settings(&mut self, a: &Arg<'a, 'b>) { + if a.is_set(ArgSettings::Last) { + // if an arg has `Last` set, we need to imply DontCollapseArgsInUsage so that args + // in the usage string don't get confused or left out. + self.set(AS::DontCollapseArgsInUsage); + self.set(AS::ContainsLast); + } + } + // actually adds the arguments pub fn add_arg(&mut self, a: Arg<'a, 'b>) { // if it's global we have to clone anyways if a.is_set(ArgSettings::Global) { return self.add_arg_ref(&a); } - self.debug_asserts(&a); + debug_assert!(self.debug_asserts(&a)); self.add_conditional_reqs(&a); self.add_arg_groups(&a); self.add_reqs(&a); + self.implied_settings(&a); if a.index.is_some() || (a.s.short.is_none() && a.s.long.is_none()) { let i = if a.index.is_none() { (self.positionals.len() + 1) @@ -217,10 +238,11 @@ impl<'a, 'b> Parser<'a, 'b> } // actually adds the arguments but from a borrow (which means we have to do some clonine) pub fn add_arg_ref(&mut self, a: &Arg<'a, 'b>) { - self.debug_asserts(a); + debug_assert!(self.debug_asserts(&a)); self.add_conditional_reqs(a); self.add_arg_groups(a); self.add_reqs(a); + self.implied_settings(&a); if a.index.is_some() || (a.s.short.is_none() && a.s.long.is_none()) { let i = if a.index.is_none() { (self.positionals.len() + 1) @@ -343,220 +365,6 @@ impl<'a, 'b> Parser<'a, 'b> pub fn required(&self) -> Iter<&str> { self.required.iter() } #[cfg_attr(feature = "lints", allow(needless_borrow))] - pub fn get_required_from(&self, - reqs: &[&'a str], - matcher: Option<&ArgMatcher<'a>>, - extra: Option<&str>) - -> VecDeque { - debugln!("Parser::get_required_from: reqs={:?}, extra={:?}", - reqs, - extra); - let mut desc_reqs: Vec<&str> = vec![]; - desc_reqs.extend(extra); - let mut new_reqs: Vec<&str> = vec![]; - macro_rules! get_requires { - (@group $a: ident, $v:ident, $p:ident) => {{ - if let Some(rl) = self.groups.iter() - .filter(|g| g.requires.is_some()) - .find(|g| &g.name == $a) - .map(|g| g.requires.as_ref().unwrap()) { - for r in rl { - if !$p.contains(&r) { - debugln!("Parser::get_required_from:iter:{}: adding group req={:?}", - $a, r); - $v.push(r); - } - } - } - }}; - ($a:ident, $what:ident, $how:ident, $v:ident, $p:ident) => {{ - if let Some(rl) = self.$what.$how() - .filter(|a| a.b.requires.is_some()) - .find(|arg| &arg.b.name == $a) - .map(|a| a.b.requires.as_ref().unwrap()) { - for &(_, r) in rl.iter() { - if !$p.contains(&r) { - debugln!("Parser::get_required_from:iter:{}: adding arg req={:?}", - $a, r); - $v.push(r); - } - } - } - }}; - } - // initialize new_reqs - for a in reqs { - get_requires!(a, flags, iter, new_reqs, reqs); - get_requires!(a, opts, iter, new_reqs, reqs); - get_requires!(a, positionals, values, new_reqs, reqs); - get_requires!(@group a, new_reqs, reqs); - } - desc_reqs.extend_from_slice(&*new_reqs); - debugln!("Parser::get_required_from: after init desc_reqs={:?}", - desc_reqs); - loop { - let mut tmp = vec![]; - for a in &new_reqs { - get_requires!(a, flags, iter, tmp, desc_reqs); - get_requires!(a, opts, iter, tmp, desc_reqs); - get_requires!(a, positionals, values, tmp, desc_reqs); - get_requires!(@group a, tmp, desc_reqs); - } - if tmp.is_empty() { - debugln!("Parser::get_required_from: no more children"); - break; - } else { - debugln!("Parser::get_required_from: after iter tmp={:?}", tmp); - debugln!("Parser::get_required_from: after iter new_reqs={:?}", - new_reqs); - desc_reqs.extend_from_slice(&*new_reqs); - new_reqs.clear(); - new_reqs.extend_from_slice(&*tmp); - debugln!("Parser::get_required_from: after iter desc_reqs={:?}", - desc_reqs); - } - } - desc_reqs.extend_from_slice(reqs); - desc_reqs.sort(); - desc_reqs.dedup(); - debugln!("Parser::get_required_from: final desc_reqs={:?}", desc_reqs); - let mut ret_val = VecDeque::new(); - let args_in_groups = self.groups - .iter() - .filter(|gn| desc_reqs.contains(&gn.name)) - .flat_map(|g| self.arg_names_in_group(&g.name)) - .collect::>(); - - let pmap = if let Some(ref m) = matcher { - desc_reqs.iter() - .filter(|a| self.positionals.values().any(|p| &&p.b.name == a)) - .filter(|&p| !m.contains(p)) - .filter_map(|p| self.positionals.values().find(|x| &x.b.name == p)) - .filter(|p| !args_in_groups.contains(&p.b.name)) - .map(|p| (p.index, p)) - .collect::>() // sort by index - } else { - desc_reqs.iter() - .filter(|a| self.positionals.values().any(|p| &&p.b.name == a)) - .filter_map(|p| self.positionals.values().find(|x| &x.b.name == p)) - .filter(|p| !args_in_groups.contains(&p.b.name)) - .map(|p| (p.index, p)) - .collect::>() // sort by index - }; - debugln!("Parser::get_required_from: args_in_groups={:?}", - args_in_groups); - for &p in pmap.values() { - let s = p.to_string(); - if args_in_groups.is_empty() || !args_in_groups.contains(&&*s) { - ret_val.push_back(s); - } - } - for a in desc_reqs.iter() - .filter(|name| !self.positionals.values().any(|p| &&p.b.name == name)) - .filter(|name| !self.groups.iter().any(|g| &&g.name == name)) - .filter(|name| !args_in_groups.contains(name)) - .filter(|name| { - !(matcher.is_some() && matcher.as_ref().unwrap().contains(name)) - }) { - debugln!("Parser::get_required_from:iter:{}:", a); - let arg = find_by_name!(self, a, flags, iter) - .map(|f| f.to_string()) - .unwrap_or_else(|| { - find_by_name!(self, a, opts, iter) - .map(|o| o.to_string()) - .expect(INTERNAL_ERROR_MSG) - }); - ret_val.push_back(arg); - } - let mut g_vec = vec![]; - for g in desc_reqs.iter().filter(|n| self.groups.iter().any(|g| &&g.name == n)) { - let g_string = self.args_in_group(g).join("|"); - g_vec.push(format!("<{}>", &g_string[..g_string.len()])); - } - g_vec.sort(); - g_vec.dedup(); - for g in g_vec { - ret_val.push_back(g); - } - - ret_val - } - - // Gets the `[ARGS]` tag for the usage string - pub fn get_args_tag(&self) -> Option { - debugln!("Parser::get_args_tag;"); - let mut count = 0; - 'outer: for p in self.positionals.values().filter(|p| { - !p.is_set(ArgSettings::Required) && - !p.is_set(ArgSettings::Hidden) - }) { - debugln!("Parser::get_args_tag:iter:{}:", p.b.name); - if let Some(g_vec) = self.groups_for_arg(p.b.name) { - for grp_s in &g_vec { - debugln!("Parser::get_args_tag:iter:{}:iter:{};", p.b.name, grp_s); - // if it's part of a required group we don't want to count it - if self.groups.iter().any(|g| g.required && (&g.name == grp_s)) { - continue 'outer; - } - } - } - count += 1; - debugln!("Parser::get_args_tag:iter: {} Args not required or hidden", - count); - } - if !self.is_set(AS::DontCollapseArgsInUsage) && count > 1 { - return None; // [ARGS] - } else if count == 1 { - let p = self.positionals - .values() - .find(|p| !p.is_set(ArgSettings::Required) && !p.is_set(ArgSettings::Hidden)) - .expect(INTERNAL_ERROR_MSG); - return Some(format!(" [{}]{}", p.name_no_brackets(), p.multiple_str())); - } else if self.is_set(AS::DontCollapseArgsInUsage) && !self.positionals.is_empty() { - return Some(self.positionals - .values() - .filter(|p| !p.is_set(ArgSettings::Required)) - .filter(|p| !p.is_set(ArgSettings::Hidden)) - .map(|p| { - format!(" [{}]{}", p.name_no_brackets(), p.multiple_str()) - }) - .collect::>() - .join("")); - } - Some("".into()) - } - - // Determines if we need the `[FLAGS]` tag in the usage string - pub fn needs_flags_tag(&self) -> bool { - debugln!("Parser::needs_flags_tag;"); - 'outer: for f in &self.flags { - debugln!("Parser::needs_flags_tag:iter: f={};", f.b.name); - if let Some(l) = f.s.long { - if l == "help" || l == "version" { - // Don't print `[FLAGS]` just for help or version - continue; - } - } - if let Some(g_vec) = self.groups_for_arg(f.b.name) { - for grp_s in &g_vec { - debugln!("Parser::needs_flags_tag:iter:iter: grp_s={};", grp_s); - if self.groups.iter().any(|g| &g.name == grp_s && g.required) { - debug!("Parser::needs_flags_tag:iter:iter: Group is required"); - continue 'outer; - } - } - } - if f.is_set(ArgSettings::Hidden) { - continue; - } - debugln!("Parser::needs_flags_tag:iter: [FLAGS] required"); - return true; - } - - debugln!("Parser::needs_flags_tag: [FLAGS] not required"); - false - } - #[inline] pub fn has_args(&self) -> bool { !(self.flags.is_empty() && self.opts.is_empty() && self.positionals.is_empty()) @@ -570,7 +378,7 @@ impl<'a, 'b> Parser<'a, 'b> #[inline] pub fn has_positionals(&self) -> bool { !self.positionals.is_empty() } - + #[inline] pub fn has_subcommands(&self) -> bool { !self.subcommands.is_empty() } @@ -616,7 +424,7 @@ impl<'a, 'b> Parser<'a, 'b> pub fn unset(&mut self, s: AS) { self.settings.unset(s) } #[cfg_attr(feature = "lints", allow(block_in_if_condition_stmt))] - pub fn verify_positionals(&mut self) { + pub fn verify_positionals(&mut self) -> bool { // Because you must wait until all arguments have been supplied, this is the first chance // to make assertions on positional argument indexes // @@ -627,71 +435,72 @@ impl<'a, 'b> Parser<'a, 'b> .iter() .rev() .next() { - debug_assert!(!(idx != self.positionals.len()), - format!("Found positional argument \"{}\" who's index is {} but there \ + assert!(!(idx != self.positionals.len()), + "Found positional argument \"{}\" who's index is {} but there \ are only {} positional arguments defined", - p.b.name, - idx, - self.positionals.len())); + p.b.name, + idx, + self.positionals.len()); } // Next we verify that only the highest index has a .multiple(true) (if any) if self.positionals.values().any(|a| { - a.is_set(ArgSettings::Multiple) && + a.b.is_set(ArgSettings::Multiple) && (a.index as usize != self.positionals.len()) }) { - - debug_assert!({ - let mut it = self.positionals.values().rev(); - // Either the final positional is required - it.next().unwrap().is_set(ArgSettings::Required) - // Or the second to last has a terminator set - || it.next().unwrap().v.terminator.is_some() - }, - "When using a positional argument with .multiple(true) that is *not the \ + let mut it = self.positionals.values().rev(); + let last = it.next().unwrap(); + let second_to_last = it.next().unwrap(); + // Either the final positional is required + // Or the second to last has a terminator or .last(true) set + let ok = last.is_set(ArgSettings::Required) || + (second_to_last.v.terminator.is_some() || + second_to_last.b.is_set(ArgSettings::Last)); + assert!(ok, + "When using a positional argument with .multiple(true) that is *not the \ last* positional argument, the last positional argument (i.e the one \ - with the highest index) *must* have .required(true) set."); - - debug_assert!({ - let num = self.positionals.len() - 1; - self.positionals - .get(num) - .unwrap() - .is_set(ArgSettings::Multiple) - }, - "Only the last positional argument, or second to last positional \ + with the highest index) *must* have .required(true) or .last(true) set."); + let num = self.positionals.len() - 1; + let ok = self.positionals + .get(num) + .unwrap() + .is_set(ArgSettings::Multiple); + assert!(ok, + "Only the last positional argument, or second to last positional \ argument may be set to .multiple(true)"); - self.set(AS::LowIndexMultiplePositional); + self.settings.set(AS::LowIndexMultiplePositional); } - debug_assert!(self.positionals - .values() - .filter(|p| { - p.b.settings.is_set(ArgSettings::Multiple) && - p.v.num_vals.is_none() - }) - .map(|_| 1) - .sum::() <= 1, - "Only one positional argument with .multiple(true) set is allowed per \ + let ok = self.positionals + .values() + .filter(|p| p.b.settings.is_set(ArgSettings::Multiple) && p.v.num_vals.is_none()) + .map(|_| 1) + .sum::() <= 1; + assert!(ok, + "Only one positional argument with .multiple(true) set is allowed per \ command"); - // If it's required we also need to ensure all previous positionals are - // required too if self.is_set(AS::AllowMissingPositional) { + // Check that if a required positional argument is found, all positions with a lower + // index are also required. let mut found = false; let mut foundx2 = false; for p in self.positionals.values().rev() { if foundx2 && !p.b.settings.is_set(ArgSettings::Required) { - // [arg1] is Ok - // [arg1] Is not - debug_assert!(p.b.settings.is_set(ArgSettings::Required), - "Found positional argument which is not required with a lower \ + assert!(p.b.is_set(ArgSettings::Required), + "Found positional argument which is not required with a lower \ index than a required positional argument by two or more: {:?} \ index {}", - p.b.name, - p.index); - } else if p.b.settings.is_set(ArgSettings::Required) { + p.b.name, + p.index); + } else if p.b.is_set(ArgSettings::Required) && !p.b.is_set(ArgSettings::Last) { + // Args that .last(true) don't count since they can be required and have + // positionals with a lower index that aren't required + // Imagine: prog [opt1] -- + // Both of these are valid invocations: + // $ prog r1 -- r2 + // $ prog r1 o1 -- r2 if found { foundx2 = true; continue; @@ -703,20 +512,38 @@ impl<'a, 'b> Parser<'a, 'b> } } } else { + // Check that if a required positional argument is found, all positions with a lower + // index are also required let mut found = false; for p in self.positionals.values().rev() { if found { - debug_assert!(p.b.settings.is_set(ArgSettings::Required), - "Found positional argument which is not required with a lower \ + assert!(p.b.is_set(ArgSettings::Required), + "Found positional argument which is not required with a lower \ index than a required positional argument: {:?} index {}", - p.b.name, - p.index); - } else if p.b.settings.is_set(ArgSettings::Required) { + p.b.name, + p.index); + } else if p.b.is_set(ArgSettings::Required) && !p.b.is_set(ArgSettings::Last) { + // Args that .last(true) don't count since they can be required and have + // positionals with a lower index that aren't required + // Imagine: prog [opt1] -- + // Both of these are valid invocations: + // $ prog r1 -- r2 + // $ prog r1 o1 -- r2 found = true; continue; } } } + if self.positionals.values().any(|p| { + p.b.is_set(ArgSettings::Last) && + p.b.is_set(ArgSettings::Required) + }) && self.has_subcommands() && + !self.is_set(AS::SubcommandsNegateReqs) { + panic!("Having a required positional argument with .last(true) set *and* child \ + subcommands without setting SubcommandsNegateReqs isn't compatible."); + } + + true } pub fn propogate_globals(&mut self) { @@ -915,7 +742,7 @@ impl<'a, 'b> Parser<'a, 'b> { debugln!("Parser::get_matches_with;"); // Verify all positional assertions pass - self.verify_positionals(); + debug_assert!(self.verify_positionals()); let has_args = self.has_args(); // Next we create the `--help` and `--version` arguments and add them if @@ -940,7 +767,9 @@ impl<'a, 'b> Parser<'a, 'b> // Does the arg match a subcommand name, or any of it's aliases (if defined) { let (is_match, sc_name) = self.possible_subcommand(&arg_os); - debugln!("Parser::get_matches_with: possible_sc={:?}, sc={:?}", is_match, sc_name); + debugln!("Parser::get_matches_with: possible_sc={:?}, sc={:?}", + is_match, + sc_name); if is_match { let sc_name = sc_name.expect(INTERNAL_ERROR_MSG); if sc_name == "help" && self.is_set(AS::NeedsSubcommandHelp) { @@ -1011,7 +840,8 @@ impl<'a, 'b> Parser<'a, 'b> .bin_name .as_ref() .unwrap_or(&self.meta.name), - &*usage::create_error_usage(self, matcher, + &*usage::create_error_usage(self, + matcher, None), self.color())); } @@ -1050,8 +880,21 @@ impl<'a, 'b> Parser<'a, 'b> debugln!("Parser::get_matches_with: Bumping the positional counter..."); pos_counter += 1; } + } else if self.is_set(AS::ContainsLast) && self.is_set(AS::TrailingValues) { + // Came to -- and one postional has .last(true) set, so we go immediately + // to the last (highest index) positional + debugln!("Parser::get_matches_with: .last(true) and --, setting last pos"); + pos_counter = self.positionals.len(); } if let Some(p) = self.positionals.get(pos_counter) { + if p.is_set(ArgSettings::Last) && !self.is_set(AS::TrailingValues) { + return Err(Error::unknown_argument(&*arg_os.to_string_lossy(), + "", + &*usage::create_error_usage(self, + matcher, + None), + self.color())); + } parse_positional!(self, p, arg_os, pos_counter, matcher); self.settings.set(AS::ValidArgFound); } else if self.is_set(AS::AllowExternalSubcommands) { @@ -1061,8 +904,8 @@ impl<'a, 'b> Parser<'a, 'b> None => { if !self.is_set(AS::StrictUtf8) { return Err(Error::invalid_utf8(&*usage::create_error_usage(self, - matcher, - None), + matcher, + None), self.color())); } arg_os.to_string_lossy().into_owned() @@ -1075,8 +918,8 @@ impl<'a, 'b> Parser<'a, 'b> let a = v.into(); if a.to_str().is_none() && !self.is_set(AS::StrictUtf8) { return Err(Error::invalid_utf8(&*usage::create_error_usage(self, - matcher, - None), + matcher, + None), self.color())); } sc_m.add_val_to("", &a); @@ -1092,8 +935,8 @@ impl<'a, 'b> Parser<'a, 'b> return Err(Error::unknown_argument(&*arg_os.to_string_lossy(), "", &*usage::create_error_usage(self, - matcher, - None), + matcher, + None), self.color())); } else if !has_args || self.is_set(AS::InferSubcommands) && self.has_subcommands() { if let Some(cdate) = suggestions::did_you_mean(&*arg_os.to_string_lossy(), @@ -1105,11 +948,12 @@ impl<'a, 'b> Parser<'a, 'b> .as_ref() .unwrap_or(&self.meta.name), &*usage::create_error_usage(self, - matcher, - None), + matcher, + None), self.color())); } else { - return Err(Error::unrecognized_subcommand(arg_os.to_string_lossy().into_owned(), + return Err(Error::unrecognized_subcommand(arg_os.to_string_lossy() + .into_owned(), self.meta .bin_name .as_ref() @@ -1135,9 +979,7 @@ impl<'a, 'b> Parser<'a, 'b> .as_ref() .unwrap_or(&self.meta.name); return Err(Error::missing_subcommand(bn, - &usage::create_error_usage(self, - matcher, - None), + &usage::create_error_usage(self, matcher, None), self.color())); } else if self.is_set(AS::SubcommandRequiredElseHelp) { debugln!("Parser::get_matches_with: SubcommandRequiredElseHelp=true"); @@ -1214,7 +1056,7 @@ impl<'a, 'b> Parser<'a, 'b> for k in matcher.arg_names() { hs.push(k); } - let reqs = self.get_required_from(&hs, Some(matcher), None); + let reqs = usage::get_required_usage_from(self, &hs, Some(matcher), None, false); for s in &reqs { write!(&mut mid_string, " {}", s).expect(INTERNAL_ERROR_MSG); @@ -1262,8 +1104,7 @@ impl<'a, 'b> Parser<'a, 'b> Ok(()) } - - fn groups_for_arg(&self, name: &str) -> Option> { + pub fn groups_for_arg(&self, name: &str) -> Option> { debugln!("Parser::groups_for_arg: name={}", name); if self.groups.is_empty() { @@ -1287,7 +1128,7 @@ impl<'a, 'b> Parser<'a, 'b> Some(res) } - fn args_in_group(&self, group: &str) -> Vec { + pub fn args_in_group(&self, group: &str) -> Vec { let mut g_vec = vec![]; let mut args = vec![]; @@ -1581,8 +1422,8 @@ impl<'a, 'b> Parser<'a, 'b> return Err(Error::unknown_argument(&*arg, "", &*usage::create_error_usage(self, - matcher, - None), + matcher, + None), self.color())); } } diff --git a/src/app/settings.rs b/src/app/settings.rs index a092e259..abc544a7 100644 --- a/src/app/settings.rs +++ b/src/app/settings.rs @@ -44,6 +44,7 @@ bitflags! { const PROPOGATED = 1 << 36, const VALID_ARG_FOUND = 1 << 37, const INFER_SUBCOMMANDS = 1 << 38, + const CONTAINS_LAST = 1 << 39, } } @@ -104,7 +105,8 @@ impl AppFlags { ValidNegNumFound => VALID_NEG_NUM_FOUND, Propogated => PROPOGATED, ValidArgFound => VALID_ARG_FOUND, - InferSubcommands => INFER_SUBCOMMANDS + InferSubcommands => INFER_SUBCOMMANDS, + ContainsLast => CONTAINS_LAST } } @@ -859,6 +861,9 @@ pub enum AppSettings { #[doc(hidden)] ValidArgFound, + + #[doc(hidden)] + ContainsLast, } impl FromStr for AppSettings { diff --git a/src/app/usage.rs b/src/app/usage.rs index 72631cd9..19938b40 100644 --- a/src/app/usage.rs +++ b/src/app/usage.rs @@ -1,3 +1,8 @@ +// std +use std::collections::{BTreeMap, VecDeque}; + +// Internal +use INTERNAL_ERROR_MSG; use args::{AnyArg, ArgMatcher, PosBuilder}; use args::settings::ArgSettings; use app::settings::AppSettings as AS; @@ -66,13 +71,14 @@ pub fn create_help_usage(p: &Parser, incl_reqs: bool) -> String { let mut reqs: Vec<&str> = p.required().map(|r| &**r).collect(); reqs.sort(); reqs.dedup(); - p.get_required_from(&reqs, None, None).iter().fold(String::new(), - |a, s| a + &format!(" {}", s)[..]) + get_required_usage_from(p, &reqs, None, None, false).iter().fold(String::new(), |a, s| { + a + &format!(" {}", s)[..] + }) } else { String::new() }; - let flags = p.needs_flags_tag(); + let flags = needs_flags_tag(p); if flags && !p.is_set(AS::UnifiedHelpMessage) { usage.push_str(" [FLAGS]"); } else if flags { @@ -85,20 +91,41 @@ pub fn create_help_usage(p: &Parser, incl_reqs: bool) -> String { usage.push_str(&req_string[..]); + let has_last = p.positionals.values().any(|p| p.is_set(ArgSettings::Last)); // places a '--' in the usage string if there are args and options // supporting multiple values - if p.has_positionals() && p.opts.iter().any(|o| o.is_set(ArgSettings::Multiple)) && + if p.opts.iter().any(|o| o.is_set(ArgSettings::Multiple)) && p.positionals.values().any(|p| !p.is_set(ArgSettings::Required)) && - !p.has_visible_subcommands() { - usage.push_str(" [--]") + !p.has_visible_subcommands() && !has_last { + usage.push_str(" [--]"); } - let not_req_or_hidden= |p: &PosBuilder| !p.is_set(ArgSettings::Required) && !p.is_set(ArgSettings::Hidden); + let not_req_or_hidden = + |p: &PosBuilder| !p.is_set(ArgSettings::Required) && !p.is_set(ArgSettings::Hidden); if p.has_positionals() && p.positionals.values().any(not_req_or_hidden) { - if let Some(args_tag) = p.get_args_tag() { + if let Some(args_tag) = get_args_tag(p, incl_reqs) { usage.push_str(&*args_tag); } else { usage.push_str(" [ARGS]"); } + if has_last && incl_reqs { + let pos = p.positionals + .values() + .find(|p| p.b.is_set(ArgSettings::Last)) + .expect(INTERNAL_ERROR_MSG); + debugln!("usage::create_help_usage: {} has .last(true)", pos.name()); + let req = pos.is_set(ArgSettings::Required); + if req { + usage.push_str(" -- <"); + } else { + usage.push_str(" [-- <"); + } + usage.push_str(pos.name()); + usage.push_str(">"); + usage.push_str(pos.multiple_str()); + if !req { + usage.push_str("]"); + } + } } // incl_reqs is only false when this function is called recursively @@ -120,6 +147,7 @@ pub fn create_help_usage(p: &Parser, incl_reqs: bool) -> String { } } usage.shrink_to_fit(); + debugln!("usage::create_help_usage: usage={}", usage); usage } @@ -131,9 +159,10 @@ fn create_smart_usage(p: &Parser, used: &[&str]) -> String { let mut hs: Vec<&str> = p.required().map(|s| &**s).collect(); hs.extend_from_slice(used); - let r_string = p.get_required_from(&hs, None, None).iter().fold(String::new(), |acc, s| { - acc + &format!(" {}", s)[..] - }); + let r_string = + get_required_usage_from(p, &hs, None, None, false).iter().fold(String::new(), |acc, s| { + acc + &format!(" {}", s)[..] + }); usage.push_str(&p.meta .usage @@ -152,3 +181,256 @@ fn create_smart_usage(p: &Parser, used: &[&str]) -> String { usage.shrink_to_fit(); usage } + +// Gets the `[ARGS]` tag for the usage string +fn get_args_tag(p: &Parser, incl_reqs: bool) -> Option { + debugln!("usage::get_args_tag;"); + let mut count = 0; + 'outer: for pos in p.positionals + .values() + .filter(|pos| !pos.is_set(ArgSettings::Required)) + .filter(|pos| !pos.is_set(ArgSettings::Hidden)) + .filter(|pos| !pos.is_set(ArgSettings::Last)) { + debugln!("usage::get_args_tag:iter:{}:", pos.b.name); + if let Some(g_vec) = p.groups_for_arg(pos.b.name) { + for grp_s in &g_vec { + debugln!("usage::get_args_tag:iter:{}:iter:{};", pos.b.name, grp_s); + // if it's part of a required group we don't want to count it + if p.groups.iter().any(|g| g.required && (&g.name == grp_s)) { + continue 'outer; + } + } + } + count += 1; + debugln!("usage::get_args_tag:iter: {} Args not required or hidden", + count); + } + if !p.is_set(AS::DontCollapseArgsInUsage) && count > 1 { + debugln!("usage::get_args_tag:iter: More than one, returning [ARGS]"); + return None; // [ARGS] + } else if count == 1 && incl_reqs { + let pos = p.positionals + .values() + .find(|pos| { + !pos.is_set(ArgSettings::Required) && !pos.is_set(ArgSettings::Hidden) && + !pos.is_set(ArgSettings::Last) + }) + .expect(INTERNAL_ERROR_MSG); + debugln!("usage::get_args_tag:iter: Exactly one, returning {}", + pos.name()); + return Some(format!(" [{}]{}", pos.name_no_brackets(), pos.multiple_str())); + } else if p.is_set(AS::DontCollapseArgsInUsage) && !p.positionals.is_empty() && incl_reqs { + debugln!("usage::get_args_tag:iter: Don't collapse returning all"); + return Some(p.positionals + .values() + .filter(|pos| !pos.is_set(ArgSettings::Required)) + .filter(|pos| !pos.is_set(ArgSettings::Hidden)) + .filter(|pos| !pos.is_set(ArgSettings::Last)) + .map(|pos| { + format!(" [{}]{}", pos.name_no_brackets(), pos.multiple_str()) + }) + .collect::>() + .join("")); + } else if !incl_reqs { + debugln!("usage::get_args_tag:iter: incl_reqs=false, building secondary usage string"); + let highest_req_pos = p.positionals + .iter() + .filter_map(|(idx, pos)| if pos.b.is_set(ArgSettings::Required) && + !pos.b.is_set(ArgSettings::Last) { + Some(idx) + } else { + None + }) + .max() + .unwrap_or(p.positionals.len()); + return Some(p.positionals + .iter() + .filter_map(|(idx, pos)| if idx <= highest_req_pos { + Some(pos) + } else { + None + }) + .filter(|pos| !pos.is_set(ArgSettings::Required)) + .filter(|pos| !pos.is_set(ArgSettings::Hidden)) + .filter(|pos| !pos.is_set(ArgSettings::Last)) + .map(|pos| { + format!(" [{}]{}", pos.name_no_brackets(), pos.multiple_str()) + }) + .collect::>() + .join("")); + } + Some("".into()) +} + +// Determines if we need the `[FLAGS]` tag in the usage string +fn needs_flags_tag(p: &Parser) -> bool { + debugln!("usage::needs_flags_tag;"); + 'outer: for f in &p.flags { + debugln!("usage::needs_flags_tag:iter: f={};", f.b.name); + if let Some(l) = f.s.long { + if l == "help" || l == "version" { + // Don't print `[FLAGS]` just for help or version + continue; + } + } + if let Some(g_vec) = p.groups_for_arg(f.b.name) { + for grp_s in &g_vec { + debugln!("usage::needs_flags_tag:iter:iter: grp_s={};", grp_s); + if p.groups.iter().any(|g| &g.name == grp_s && g.required) { + debugln!("usage::needs_flags_tag:iter:iter: Group is required"); + continue 'outer; + } + } + } + if f.is_set(ArgSettings::Hidden) { + continue; + } + debugln!("usage::needs_flags_tag:iter: [FLAGS] required"); + return true; + } + + debugln!("usage::needs_flags_tag: [FLAGS] not required"); + false +} + +// Returns the required args in usage string form by fully unrolling all groups +pub fn get_required_usage_from<'a, 'b>(p: &Parser<'a, 'b>, + reqs: &[&'a str], + matcher: Option<&ArgMatcher<'a>>, + extra: Option<&str>, + incl_last: bool) + -> VecDeque { + debugln!("usage::get_required_usage_from: reqs={:?}, extra={:?}", + reqs, + extra); + let mut desc_reqs: Vec<&str> = vec![]; + desc_reqs.extend(extra); + let mut new_reqs: Vec<&str> = vec![]; + macro_rules! get_requires { + (@group $a: ident, $v:ident, $p:ident) => {{ + if let Some(rl) = p.groups.iter() + .filter(|g| g.requires.is_some()) + .find(|g| &g.name == $a) + .map(|g| g.requires.as_ref().unwrap()) { + for r in rl { + if !$p.contains(&r) { + debugln!("usage::get_required_usage_from:iter:{}: adding group req={:?}", + $a, r); + $v.push(r); + } + } + } + }}; + ($a:ident, $what:ident, $how:ident, $v:ident, $p:ident) => {{ + if let Some(rl) = p.$what.$how() + .filter(|a| a.b.requires.is_some()) + .find(|arg| &arg.b.name == $a) + .map(|a| a.b.requires.as_ref().unwrap()) { + for &(_, r) in rl.iter() { + if !$p.contains(&r) { + debugln!("usage::get_required_usage_from:iter:{}: adding arg req={:?}", + $a, r); + $v.push(r); + } + } + } + }}; + } + // initialize new_reqs + for a in reqs { + get_requires!(a, flags, iter, new_reqs, reqs); + get_requires!(a, opts, iter, new_reqs, reqs); + get_requires!(a, positionals, values, new_reqs, reqs); + get_requires!(@group a, new_reqs, reqs); + } + desc_reqs.extend_from_slice(&*new_reqs); + debugln!("usage::get_required_usage_from: after init desc_reqs={:?}", + desc_reqs); + loop { + let mut tmp = vec![]; + for a in &new_reqs { + get_requires!(a, flags, iter, tmp, desc_reqs); + get_requires!(a, opts, iter, tmp, desc_reqs); + get_requires!(a, positionals, values, tmp, desc_reqs); + get_requires!(@group a, tmp, desc_reqs); + } + if tmp.is_empty() { + debugln!("usage::get_required_usage_from: no more children"); + break; + } else { + debugln!("usage::get_required_usage_from: after iter tmp={:?}", tmp); + debugln!("usage::get_required_usage_from: after iter new_reqs={:?}", + new_reqs); + desc_reqs.extend_from_slice(&*new_reqs); + new_reqs.clear(); + new_reqs.extend_from_slice(&*tmp); + debugln!("usage::get_required_usage_from: after iter desc_reqs={:?}", + desc_reqs); + } + } + desc_reqs.extend_from_slice(reqs); + desc_reqs.sort(); + desc_reqs.dedup(); + debugln!("usage::get_required_usage_from: final desc_reqs={:?}", + desc_reqs); + let mut ret_val = VecDeque::new(); + let args_in_groups = p.groups + .iter() + .filter(|gn| desc_reqs.contains(&gn.name)) + .flat_map(|g| p.arg_names_in_group(&g.name)) + .collect::>(); + + let pmap = if let Some(ref m) = matcher { + desc_reqs.iter() + .filter(|a| p.positionals.values().any(|p| &&p.b.name == a)) + .filter(|&pos| !m.contains(pos)) + .filter_map(|pos| p.positionals.values().find(|x| &x.b.name == pos)) + .filter(|&pos| incl_last || !pos.is_set(ArgSettings::Last)) + .filter(|pos| !args_in_groups.contains(&pos.b.name)) + .map(|pos| (pos.index, pos)) + .collect::>() // sort by index + } else { + desc_reqs.iter() + .filter(|a| p.positionals.values().any(|pos| &&pos.b.name == a)) + .filter_map(|pos| p.positionals.values().find(|x| &x.b.name == pos)) + .filter(|&pos| incl_last || !pos.is_set(ArgSettings::Last)) + .filter(|pos| !args_in_groups.contains(&pos.b.name)) + .map(|pos| (pos.index, pos)) + .collect::>() // sort by index + }; + debugln!("usage::get_required_usage_from: args_in_groups={:?}", + args_in_groups); + for &p in pmap.values() { + let s = p.to_string(); + if args_in_groups.is_empty() || !args_in_groups.contains(&&*s) { + ret_val.push_back(s); + } + } + for a in desc_reqs.iter() + .filter(|name| !p.positionals.values().any(|p| &&p.b.name == name)) + .filter(|name| !p.groups.iter().any(|g| &&g.name == name)) + .filter(|name| !args_in_groups.contains(name)) + .filter(|name| !(matcher.is_some() && matcher.as_ref().unwrap().contains(name))) { + debugln!("usage::get_required_usage_from:iter:{}:", a); + let arg = find_by_name!(p, a, flags, iter) + .map(|f| f.to_string()) + .unwrap_or_else(|| { + find_by_name!(p, a, opts, iter) + .map(|o| o.to_string()) + .expect(INTERNAL_ERROR_MSG) + }); + ret_val.push_back(arg); + } + let mut g_vec = vec![]; + for g in desc_reqs.iter().filter(|n| p.groups.iter().any(|g| &&g.name == n)) { + let g_string = p.args_in_group(g).join("|"); + g_vec.push(format!("<{}>", &g_string[..g_string.len()])); + } + g_vec.sort(); + g_vec.dedup(); + for g in g_vec { + ret_val.push_back(g); + } + + ret_val +} diff --git a/src/app/validator.rs b/src/app/validator.rs index 9130751a..f874a8dc 100644 --- a/src/app/validator.rs +++ b/src/app/validator.rs @@ -415,7 +415,6 @@ impl<'a, 'b, 'z> Validator<'a, 'b, 'z> { } } - #[inline] fn missing_required_error(&self, matcher: &ArgMatcher, extra: Option<&str>) -> ClapResult<()> { debugln!("Validator::missing_required_error: extra={:?}", extra); let c = Colorizer { @@ -433,14 +432,13 @@ impl<'a, 'b, 'z> Validator<'a, 'b, 'z> { reqs.retain(|n| !matcher.contains(n)); reqs.dedup(); debugln!("Validator::missing_required_error: reqs={:#?}", reqs); - Err(Error::missing_required_argument(&*self.0 - .get_required_from(&reqs[..], - Some(matcher), - extra) - .iter() - .fold(String::new(), |acc, s| { - acc + &format!("\n {}", c.error(s))[..] - }), + let req_args = + usage::get_required_usage_from(self.0, &reqs[..], Some(matcher), extra, true) + .iter() + .fold(String::new(), + |acc, s| acc + &format!("\n {}", c.error(s))[..]); + debugln!("Validator::missing_required_error: req_args={:#?}", req_args); + Err(Error::missing_required_argument(&*req_args, &*usage::create_error_usage(self.0, matcher, extra), self.0.color())) } diff --git a/src/args/arg.rs b/src/args/arg.rs index 53cd262f..2fd93a66 100644 --- a/src/args/arg.rs +++ b/src/args/arg.rs @@ -537,6 +537,86 @@ impl<'a, 'b> Arg<'a, 'b> { self } + /// Specifies that this arg is the last, or final, positional argument (i.e. has the highest + /// index) and is *only* able to be accessed via the `--` syntax (i.e. `$ prog args -- + /// last_arg`). Even, if no other arguments are left to parse, if the user omits the `--` syntax + /// they will receive an [`UnknownArgument`] error. Setting an argument to `.last(true)` also + /// allows one to access this arg early using the `--` syntax. Accessing an arg early, even with + /// the `--` syntax is otherwise not possible. + /// + /// **NOTE:** This will change the usage string to look like `$ prog [FLAGS] [-- ]` if + /// `ARG` is marked as `.last(true)`. + /// + /// **NOTE:** This setting will imply [`AppSettings::DontCollapseArgsInUsage`] because failing + /// to set this can make the usage string very confusing. + /// + /// **NOTE**: This setting only applies to positional arguments, and has no affect on FLAGS / + /// OPTIONS + /// + /// **CAUTION:** Setting an argument to `.last(true)` *and* having child subcommands is not + /// recommended with the exception of *also* using [`AppSettings::ArgsNegateSubcommands`] + /// (or [`AppSettings::SubcommandsNegateReqs`] if the argument marked `.last(true)` is also + /// marked [`.required(true)`]) + /// + /// # Examples + /// + /// ```rust + /// # use clap::Arg; + /// Arg::with_name("args") + /// .last(true) + /// # ; + /// ``` + /// + /// Setting [`Arg::last(true)`] ensures the arg has the highest [index] of all positional args + /// and requires that the `--` syntax be used to access it early. + /// + /// ```rust + /// # use clap::{App, Arg}; + /// let res = App::new("prog") + /// .arg(Arg::with_name("first")) + /// .arg(Arg::with_name("second")) + /// .arg(Arg::with_name("third").last(true)) + /// .get_matches_from_safe(vec![ + /// "prog", "one", "--", "three" + /// ]); + /// + /// assert!(res.is_ok()); + /// let m = res.unwrap(); + /// assert_eq!(m.value_of("third"), Some("three")); + /// assert!(m.value_of("second").is_none()); + /// ``` + /// + /// Even if the positional argument marked `.last(true)` is the only argument left to parse, + /// failing to use the `--` syntax results in an error. + /// + /// ```rust + /// # use clap::{App, Arg, ErrorKind}; + /// let res = App::new("prog") + /// .arg(Arg::with_name("first")) + /// .arg(Arg::with_name("second")) + /// .arg(Arg::with_name("third").last(true)) + /// .get_matches_from_safe(vec![ + /// "prog", "one", "two", "three" + /// ]); + /// + /// assert!(res.is_err()); + /// assert_eq!(res.unwrap_err().kind, ErrorKind::UnknownArgument); + /// ``` + /// [`Arg::last(true)`]: ./struct.Arg.html#method.last + /// [index]: ./struct.Arg.html#method.index + /// [`AppSettings::DontCollapseArgsInUsage`]: ./enum.AppSettings.html#variant.DontCollapseArgsInUsage + /// [`AppSettings::ArgsNegateSubcommands`]: ./enum.AppSettings.html#variant.ArgsNegateSubcommands + /// [`AppSettings::SubcommandsNegateReqs`]: ./enum.AppSettings.html#variant.SubcommandsNegateReqs + /// [`.required(true)`]: ./struct.Arg.html#method.required + /// [`UnknownArgument`]: ./enum.ErrorKind.html#variant.UnknownArgument + pub fn last(self, l: bool) -> Self { + if l { + self.set(ArgSettings::Last) + } else { + self.unset(ArgSettings::Last) + } + } + /// Sets whether or not the argument is required by default. Required by default means it is /// required, when no other conflicting rules have been evaluated. Conflicting rules take /// precedence over being required. **Default:** `false` diff --git a/src/args/settings.rs b/src/args/settings.rs index 28281dce..82d36f57 100644 --- a/src/args/settings.rs +++ b/src/args/settings.rs @@ -18,6 +18,7 @@ bitflags! { const HIDE_POS_VALS = 1 << 11, const ALLOW_TAC_VALS = 1 << 12, const REQUIRE_EQUALS = 1 << 13, + const LAST = 1 << 14, } } @@ -42,7 +43,8 @@ impl ArgFlags { ValueDelimiterNotSet => DELIM_NOT_SET, HidePossibleValues => HIDE_POS_VALS, AllowLeadingHyphen => ALLOW_TAC_VALS, - RequireEquals => REQUIRE_EQUALS + RequireEquals => REQUIRE_EQUALS, + Last => LAST } } @@ -82,6 +84,9 @@ pub enum ArgSettings { AllowLeadingHyphen, /// Require options use `--option=val` syntax RequireEquals, + /// Specifies that the arg is the last positional argument and may be accessed early via `--` + /// syntax + Last, #[doc(hidden)] RequiredUnlessAll, #[doc(hidden)] @@ -106,6 +111,7 @@ impl FromStr for ArgSettings { "hidepossiblevalues" => Ok(ArgSettings::HidePossibleValues), "allowleadinghyphen" => Ok(ArgSettings::AllowLeadingHyphen), "requireequals" => Ok(ArgSettings::RequireEquals), + "last" => Ok(ArgSettings::Last), _ => Err("unknown ArgSetting, cannot convert from str".to_owned()), } } @@ -145,6 +151,8 @@ mod test { ArgSettings::ValueDelimiterNotSet); assert_eq!("requireequals".parse::().unwrap(), ArgSettings::RequireEquals); + assert_eq!("last".parse::().unwrap(), + ArgSettings::Last); assert!("hahahaha".parse::().is_err()); } }