#![cfg_attr(not(feature = "usage"), allow(unused_imports))]
#![cfg_attr(not(feature = "usage"), allow(unused_variables))]
#![cfg_attr(not(feature = "usage"), allow(clippy::manual_map))]
#![cfg_attr(not(feature = "usage"), allow(dead_code))]
// Internal
use crate::builder::ArgAction;
use crate::builder::StyledStr;
use crate::builder::Styles;
use crate::builder::{ArgPredicate, Command};
use crate::parser::ArgMatcher;
use crate::util::ChildGraph;
use crate::util::FlatSet;
use crate::util::Id;
static DEFAULT_SUB_VALUE_NAME: &str = "COMMAND";
const USAGE_SEP: &str = "\n ";
pub(crate) struct Usage<'cmd> {
cmd: &'cmd Command,
styles: &'cmd Styles,
required: Option<&'cmd ChildGraph<Id>>,
}
impl<'cmd> Usage<'cmd> {
pub(crate) fn new(cmd: &'cmd Command) -> Self {
Usage {
cmd,
styles: cmd.get_styles(),
required: None,
}
}
pub(crate) fn required(mut self, required: &'cmd ChildGraph<Id>) -> Self {
self.required = Some(required);
self
}
// Creates a usage string for display. This happens just after all arguments were parsed, but before
// any subcommands have been parsed (so as to give subcommands their own usage recursively)
pub(crate) fn create_usage_with_title(&self, used: &[Id]) -> Option<StyledStr> {
debug!("Usage::create_usage_with_title");
use std::fmt::Write as _;
let mut styled = StyledStr::new();
let _ = write!(
styled,
"{}Usage:{} ",
self.styles.get_usage().render(),
self.styles.get_usage().render_reset()
);
if self.write_usage_no_title(&mut styled, used) {
styled.trim_end();
} else {
return None;
}
debug!("Usage::create_usage_with_title: usage={styled}");
Some(styled)
}
// Creates a usage string (*without title*) if one was not provided by the user manually.
pub(crate) fn create_usage_no_title(&self, used: &[Id]) -> Option<StyledStr> {
debug!("Usage::create_usage_no_title");
let mut styled = StyledStr::new();
if self.write_usage_no_title(&mut styled, used) {
styled.trim_end();
debug!("Usage::create_usage_no_title: usage={styled}");
Some(styled)
} else {
None
}
}
// Creates a usage string (*without title*) if one was not provided by the user manually.
fn write_usage_no_title(&self, styled: &mut StyledStr, used: &[Id]) -> bool {
debug!("Usage::create_usage_no_title");
if let Some(u) = self.cmd.get_override_usage() {
styled.push_styled(u);
true
} else {
#[cfg(feature = "usage")]
{
if used.is_empty() {
self.write_help_usage(styled);
} else {
self.write_smart_usage(styled, used);
}
true
}
#[cfg(not(feature = "usage"))]
{
false
}
}
}
}
#[cfg(feature = "usage")]
impl<'cmd> Usage<'cmd> {
// Creates a usage string for display in help messages (i.e. not for errors)
fn write_help_usage(&self, styled: &mut StyledStr) {
debug!("Usage::write_help_usage");
use std::fmt::Write;
if self.cmd.has_visible_subcommands() && self.cmd.is_flatten_help_set() {
if !self.cmd.is_subcommand_required_set()
|| self.cmd.is_args_conflicts_with_subcommands_set()
{
self.write_arg_usage(styled, &[], true);
styled.trim_end();
let _ = write!(styled, "{}", USAGE_SEP);
}
let mut cmd = self.cmd.clone();
cmd.build();
for (i, sub) in cmd
.get_subcommands()
.filter(|c| !c.is_hide_set())
.enumerate()
{
if i != 0 {
styled.trim_end();
let _ = write!(styled, "{}", USAGE_SEP);
}
Usage::new(sub).write_usage_no_title(styled, &[]);
}
} else {
self.write_arg_usage(styled, &[], true);
self.write_subcommand_usage(styled);
}
}
// Creates a context aware usage string, or "smart usage" from currently used
// args, and requirements
fn write_smart_usage(&self, styled: &mut StyledStr, used: &[Id]) {
debug!("Usage::create_smart_usage");
use std::fmt::Write;
let placeholder = &self.styles.get_placeholder();
self.write_arg_usage(styled, used, true);
if self.cmd.is_subcommand_required_set() {
let value_name = self
.cmd
.get_subcommand_value_name()
.unwrap_or(DEFAULT_SUB_VALUE_NAME);
let _ = write!(
styled,
"{}<{value_name}>{}",
placeholder.render(),
placeholder.render_reset()
);
}
}
fn write_arg_usage(&self, styled: &mut StyledStr, used: &[Id], incl_reqs: bool) {
debug!("Usage::write_arg_usage; incl_reqs={incl_reqs:?}");
use std::fmt::Write as _;
let literal = &self.styles.get_literal();
let placeholder = &self.styles.get_placeholder();
let bin_name = self.cmd.get_usage_name_fallback();
if !bin_name.is_empty() {
// the trim won't properly remove a leading space due to the formatting
let _ = write!(
styled,
"{}{bin_name}{} ",
literal.render(),
literal.render_reset()
);
}
if used.is_empty() && self.needs_options_tag() {
let _ = write!(
styled,
"{}[OPTIONS]{} ",
placeholder.render(),
placeholder.render_reset()
);
}
self.write_args(styled, used, !incl_reqs);
}
fn write_subcommand_usage(&self, styled: &mut StyledStr) {
debug!("Usage::write_subcommand_usage");
use std::fmt::Write as _;
// incl_reqs is only false when this function is called recursively
if self.cmd.has_visible_subcommands() || self.cmd.is_allow_external_subcommands_set() {
let literal = &self.styles.get_literal();
let placeholder = &self.styles.get_placeholder();
let value_name = self
.cmd
.get_subcommand_value_name()
.unwrap_or(DEFAULT_SUB_VALUE_NAME);
if self.cmd.is_subcommand_negates_reqs_set()
|| self.cmd.is_args_conflicts_with_subcommands_set()
{
styled.trim_end();
let _ = write!(styled, "{}", USAGE_SEP);
if self.cmd.is_args_conflicts_with_subcommands_set() {
let bin_name = self.cmd.get_usage_name_fallback();
// Short-circuit full usage creation since no args will be relevant
let _ = write!(
styled,
"{}{bin_name}{} ",
literal.render(),
literal.render_reset()
);
} else {
self.write_arg_usage(styled, &[], false);
}
let _ = write!(
styled,
"{}<{value_name}>{}",
placeholder.render(),
placeholder.render_reset()
);
} else if self.cmd.is_subcommand_required_set() {
let _ = write!(
styled,
"{}<{value_name}>{}",
placeholder.render(),
placeholder.render_reset()
);
} else {
let _ = write!(
styled,
"{}[{value_name}]{}",
placeholder.render(),
placeholder.render_reset()
);
}
}
}
// Determines if we need the `[OPTIONS]` tag in the usage string
fn needs_options_tag(&self) -> bool {
debug!("Usage::needs_options_tag");
'outer: for f in self.cmd.get_non_positionals() {
debug!("Usage::needs_options_tag:iter: f={}", f.get_id());
// Don't print `[OPTIONS]` just for help or version
if f.get_long() == Some("help") || f.get_long() == Some("version") {
debug!("Usage::needs_options_tag:iter Option is built-in");
continue;
}
match f.get_action() {
ArgAction::Set
| ArgAction::Append
| ArgAction::SetTrue
| ArgAction::SetFalse
| ArgAction::Count => {}
ArgAction::Help
| ArgAction::HelpShort
| ArgAction::HelpLong
| ArgAction::Version => {
debug!("Usage::needs_options_tag:iter Option is built-in");
continue;
}
}
if f.is_hide_set() {
debug!("Usage::needs_options_tag:iter Option is hidden");
continue;
}
if f.is_required_set() {
debug!("Usage::needs_options_tag:iter Option is required");
continue;
}
for grp_s in self.cmd.groups_for_arg(f.get_id()) {
debug!("Usage::needs_options_tag:iter:iter: grp_s={grp_s:?}");
if self.cmd.get_groups().any(|g| g.id == grp_s && g.required) {
debug!("Usage::needs_options_tag:iter:iter: Group is required");
continue 'outer;
}
}
debug!("Usage::needs_options_tag:iter: [OPTIONS] required");
return true;
}
debug!("Usage::needs_options_tag: [OPTIONS] not required");
false
}
// Returns the required args in usage string form by fully unrolling all groups
pub(crate) fn write_args(&self, styled: &mut StyledStr, incls: &[Id], force_optional: bool) {
debug!("Usage::write_args: incls={incls:?}",);
use std::fmt::Write as _;
let literal = &self.styles.get_literal();
let required_owned;
let required = if let Some(required) = self.required {
required
} else {
required_owned = self.cmd.required_graph();
&required_owned
};
let mut unrolled_reqs = Vec::new();
for a in required.iter() {
let is_relevant = |(val, req_arg): &(ArgPredicate, Id)| -> Option<Id> {
let required = match val {
ArgPredicate::Equals(_) => false,
ArgPredicate::IsPresent => true,
};
required.then(|| req_arg.clone())
};
for aa in self.cmd.unroll_arg_requires(is_relevant, a) {
// if we don't check for duplicates here this causes duplicate error messages
// see https://github.com/clap-rs/clap/issues/2770
unrolled_reqs.push(aa);
}
// always include the required arg itself. it will not be enumerated
// by unroll_requirements_for_arg.
unrolled_reqs.push(a.clone());
}
debug!("Usage::get_args: unrolled_reqs={unrolled_reqs:?}");
let mut required_groups_members = FlatSet::new();
let mut required_groups = FlatSet::new();
for req in unrolled_reqs.iter().chain(incls.iter()) {
if self.cmd.find_group(req).is_some() {
let group_members = self.cmd.unroll_args_in_group(req);
let elem = self.cmd.format_group(req);
required_groups.insert(elem);
required_groups_members.extend(group_members);
} else {
debug_assert!(self.cmd.find(req).is_some());
}
}
let mut required_opts = FlatSet::new();
let mut required_positionals = Vec::new();
for req in unrolled_reqs.iter().chain(incls.iter()) {
if let Some(arg) = self.cmd.find(req) {
if required_groups_members.contains(arg.get_id()) {
continue;
}
let stylized = arg.stylized(self.styles, Some(!force_optional));
if let Some(index) = arg.get_index() {
let new_len = index + 1;
if required_positionals.len() < new_len {
required_positionals.resize(new_len, None);
}
required_positionals[index] = Some(stylized);
} else {
required_opts.insert(stylized);
}
} else {
debug_assert!(self.cmd.find_group(req).is_some());
}
}
for pos in self.cmd.get_positionals() {
if pos.is_hide_set() {
continue;
}
if required_groups_members.contains(pos.get_id()) {
continue;
}
let index = pos.get_index().unwrap();
let new_len = index + 1;
if required_positionals.len() < new_len {
required_positionals.resize(new_len, None);
}
if required_positionals[index].is_some() {
if pos.is_last_set() {
let styled = required_positionals[index].take().unwrap();
let mut new = StyledStr::new();
let _ = write!(new, "{}--{} ", literal.render(), literal.render_reset());
new.push_styled(&styled);
required_positionals[index] = Some(new);
}
} else {
let mut styled;
if pos.is_last_set() {
styled = StyledStr::new();
let _ = write!(styled, "{}[--{} ", literal.render(), literal.render_reset());
styled.push_styled(&pos.stylized(self.styles, Some(true)));
let _ = write!(styled, "{}]{}", literal.render(), literal.render_reset());
} else {
styled = pos.stylized(self.styles, Some(false));
}
required_positionals[index] = Some(styled);
}
if pos.is_last_set() && force_optional {
required_positionals[index] = None;
}
}
if !force_optional {
for arg in required_opts {
styled.push_styled(&arg);
styled.push_str(" ");
}
for arg in required_groups {
styled.push_styled(&arg);
styled.push_str(" ");
}
}
for arg in required_positionals.into_iter().flatten() {
styled.push_styled(&arg);
styled.push_str(" ");
}
}
pub(crate) fn get_required_usage_from(
&self,
incls: &[Id],
matcher: Option<&ArgMatcher>,
incl_last: bool,
) -> Vec<StyledStr> {
debug!(
"Usage::get_required_usage_from: incls={:?}, matcher={:?}, incl_last={:?}",
incls,
matcher.is_some(),
incl_last
);
let required_owned;
let required = if let Some(required) = self.required {
required
} else {
required_owned = self.cmd.required_graph();
&required_owned
};
let mut unrolled_reqs = Vec::new();
for a in required.iter() {
let is_relevant = |(val, req_arg): &(ArgPredicate, Id)| -> Option<Id> {
let required = match val {
ArgPredicate::Equals(_) => {
if let Some(matcher) = matcher {
matcher.check_explicit(a, val)
} else {
false
}
}
ArgPredicate::IsPresent => true,
};
required.then(|| req_arg.clone())
};
for aa in self.cmd.unroll_arg_requires(is_relevant, a) {
// if we don't check for duplicates here this causes duplicate error messages
// see https://github.com/clap-rs/clap/issues/2770
unrolled_reqs.push(aa);
}
// always include the required arg itself. it will not be enumerated
// by unroll_requirements_for_arg.
unrolled_reqs.push(a.clone());
}
debug!("Usage::get_required_usage_from: unrolled_reqs={unrolled_reqs:?}");
let mut required_groups_members = FlatSet::new();
let mut required_groups = FlatSet::new();
for req in unrolled_reqs.iter().chain(incls.iter()) {
if self.cmd.find_group(req).is_some() {
let group_members = self.cmd.unroll_args_in_group(req);
let is_present = matcher
.map(|m| {
group_members
.iter()
.any(|arg| m.check_explicit(arg, &ArgPredicate::IsPresent))
})
.unwrap_or(false);
debug!("Usage::get_required_usage_from:iter:{req:?} group is_present={is_present}");
if is_present {
continue;
}
let elem = self.cmd.format_group(req);
required_groups.insert(elem);
required_groups_members.extend(group_members);
} else {
debug_assert!(self.cmd.find(req).is_some(), "`{req}` must exist");
}
}
let mut required_opts = FlatSet::new();
let mut required_positionals = Vec::new();
for req in unrolled_reqs.iter().chain(incls.iter()) {
if let Some(arg) = self.cmd.find(req) {
if required_groups_members.contains(arg.get_id()) {
continue;
}
let is_present = matcher
.map(|m| m.check_explicit(req, &ArgPredicate::IsPresent))
.unwrap_or(false);
debug!("Usage::get_required_usage_from:iter:{req:?} arg is_present={is_present}");
if is_present {
continue;
}
let stylized = arg.stylized(self.styles, Some(true));
if let Some(index) = arg.get_index() {
if !arg.is_last_set() || incl_last {
let new_len = index + 1;
if required_positionals.len() < new_len {
required_positionals.resize(new_len, None);
}
required_positionals[index] = Some(stylized);
}
} else {
required_opts.insert(stylized);
}
} else {
debug_assert!(self.cmd.find_group(req).is_some());
}
}
let mut ret_val = Vec::new();
ret_val.extend(required_opts);
ret_val.extend(required_groups);
for pos in required_positionals.into_iter().flatten() {
ret_val.push(pos);
}
debug!("Usage::get_required_usage_from: ret_val={ret_val:?}");
ret_val
}
}
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