Initial vendor packages

Signed-off-by: Valentin Popov <valentin@popov.link>

1 files changed, 1198 insertions, 0 deletions

diff --git a/vendor/clap_builder/src/output/help_template.rs b/vendor/clap_builder/src/output/help_template.rs
new file mode 100644
index 0000000..dff15ff
--- /dev/null
+++ b/vendor/clap_builder/src/output/help_template.rs
@@ -0,0 +1,1198 @@
+// HACK: for rust 1.64 (1.68 doesn't need this since this is in lib.rs)
+//
+// Wanting consistency in our calls
+#![allow(clippy::write_with_newline)]
+
+// Std
+use std::borrow::Cow;
+use std::cmp;
+use std::usize;
+
+// Internal
+use crate::builder::PossibleValue;
+use crate::builder::Str;
+use crate::builder::StyledStr;
+use crate::builder::Styles;
+use crate::builder::{Arg, Command};
+use crate::output::display_width;
+use crate::output::wrap;
+use crate::output::Usage;
+use crate::output::TAB;
+use crate::output::TAB_WIDTH;
+use crate::util::FlatSet;
+
+/// `clap` auto-generated help writer
+pub(crate) struct AutoHelp<'cmd, 'writer> {
+    template: HelpTemplate<'cmd, 'writer>,
+}
+
+// Public Functions
+impl<'cmd, 'writer> AutoHelp<'cmd, 'writer> {
+    /// Create a new `HelpTemplate` instance.
+    pub(crate) fn new(
+        writer: &'writer mut StyledStr,
+        cmd: &'cmd Command,
+        usage: &'cmd Usage<'cmd>,
+        use_long: bool,
+    ) -> Self {
+        Self {
+            template: HelpTemplate::new(writer, cmd, usage, use_long),
+        }
+    }
+
+    pub(crate) fn write_help(&mut self) {
+        let pos = self
+            .template
+            .cmd
+            .get_positionals()
+            .any(|arg| should_show_arg(self.template.use_long, arg));
+        let non_pos = self
+            .template
+            .cmd
+            .get_non_positionals()
+            .any(|arg| should_show_arg(self.template.use_long, arg));
+        let subcmds = self.template.cmd.has_visible_subcommands();
+
+        let template = if non_pos || pos || subcmds {
+            DEFAULT_TEMPLATE
+        } else {
+            DEFAULT_NO_ARGS_TEMPLATE
+        };
+        self.template.write_templated_help(template);
+    }
+}
+
+const DEFAULT_TEMPLATE: &str = "\
+{before-help}{about-with-newline}
+{usage-heading} {usage}
+
+{all-args}{after-help}\
+    ";
+
+const DEFAULT_NO_ARGS_TEMPLATE: &str = "\
+{before-help}{about-with-newline}
+{usage-heading} {usage}{after-help}\
+    ";
+
+/// `clap` HelpTemplate Writer.
+///
+/// Wraps a writer stream providing different methods to generate help for `clap` objects.
+pub(crate) struct HelpTemplate<'cmd, 'writer> {
+    writer: &'writer mut StyledStr,
+    cmd: &'cmd Command,
+    styles: &'cmd Styles,
+    usage: &'cmd Usage<'cmd>,
+    next_line_help: bool,
+    term_w: usize,
+    use_long: bool,
+}
+
+// Public Functions
+impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
+    /// Create a new `HelpTemplate` instance.
+    pub(crate) fn new(
+        writer: &'writer mut StyledStr,
+        cmd: &'cmd Command,
+        usage: &'cmd Usage<'cmd>,
+        use_long: bool,
+    ) -> Self {
+        debug!(
+            "HelpTemplate::new cmd={}, use_long={}",
+            cmd.get_name(),
+            use_long
+        );
+        let term_w = Self::term_w(cmd);
+        let next_line_help = cmd.is_next_line_help_set();
+
+        HelpTemplate {
+            writer,
+            cmd,
+            styles: cmd.get_styles(),
+            usage,
+            next_line_help,
+            term_w,
+            use_long,
+        }
+    }
+
+    #[cfg(not(feature = "unstable-v5"))]
+    fn term_w(cmd: &'cmd Command) -> usize {
+        match cmd.get_term_width() {
+            Some(0) => usize::MAX,
+            Some(w) => w,
+            None => {
+                let (current_width, _h) = dimensions();
+                let current_width = current_width.unwrap_or(100);
+                let max_width = match cmd.get_max_term_width() {
+                    None | Some(0) => usize::MAX,
+                    Some(mw) => mw,
+                };
+                cmp::min(current_width, max_width)
+            }
+        }
+    }
+
+    #[cfg(feature = "unstable-v5")]
+    fn term_w(cmd: &'cmd Command) -> usize {
+        let term_w = match cmd.get_term_width() {
+            Some(0) => usize::MAX,
+            Some(w) => w,
+            None => {
+                let (current_width, _h) = dimensions();
+                current_width.unwrap_or(usize::MAX)
+            }
+        };
+
+        let max_term_w = match cmd.get_max_term_width() {
+            Some(0) => usize::MAX,
+            Some(mw) => mw,
+            None => 100,
+        };
+
+        cmp::min(term_w, max_term_w)
+    }
+
+    /// Write help to stream for the parser in the format defined by the template.
+    ///
+    /// For details about the template language see [`Command::help_template`].
+    ///
+    /// [`Command::help_template`]: Command::help_template()
+    pub(crate) fn write_templated_help(&mut self, template: &str) {
+        debug!("HelpTemplate::write_templated_help");
+        use std::fmt::Write as _;
+
+        let mut parts = template.split('{');
+        if let Some(first) = parts.next() {
+            self.writer.push_str(first);
+        }
+        for part in parts {
+            if let Some((tag, rest)) = part.split_once('}') {
+                match tag {
+                    "name" => {
+                        self.write_display_name();
+                    }
+                    #[cfg(not(feature = "unstable-v5"))]
+                    "bin" => {
+                        self.write_bin_name();
+                    }
+                    "version" => {
+                        self.write_version();
+                    }
+                    "author" => {
+                        self.write_author(false, false);
+                    }
+                    "author-with-newline" => {
+                        self.write_author(false, true);
+                    }
+                    "author-section" => {
+                        self.write_author(true, true);
+                    }
+                    "about" => {
+                        self.write_about(false, false);
+                    }
+                    "about-with-newline" => {
+                        self.write_about(false, true);
+                    }
+                    "about-section" => {
+                        self.write_about(true, true);
+                    }
+                    "usage-heading" => {
+                        let _ = write!(
+                            self.writer,
+                            "{}Usage:{}",
+                            self.styles.get_usage().render(),
+                            self.styles.get_usage().render_reset()
+                        );
+                    }
+                    "usage" => {
+                        self.writer.push_styled(
+                            &self.usage.create_usage_no_title(&[]).unwrap_or_default(),
+                        );
+                    }
+                    "all-args" => {
+                        self.write_all_args();
+                    }
+                    "options" => {
+                        // Include even those with a heading as we don't have a good way of
+                        // handling help_heading in the template.
+                        self.write_args(
+                            &self.cmd.get_non_positionals().collect::<Vec<_>>(),
+                            "options",
+                            option_sort_key,
+                        );
+                    }
+                    "positionals" => {
+                        self.write_args(
+                            &self.cmd.get_positionals().collect::<Vec<_>>(),
+                            "positionals",
+                            positional_sort_key,
+                        );
+                    }
+                    "subcommands" => {
+                        self.write_subcommands(self.cmd);
+                    }
+                    "tab" => {
+                        self.writer.push_str(TAB);
+                    }
+                    "after-help" => {
+                        self.write_after_help();
+                    }
+                    "before-help" => {
+                        self.write_before_help();
+                    }
+                    _ => {
+                        let _ = write!(self.writer, "{{{tag}}}");
+                    }
+                }
+                self.writer.push_str(rest);
+            }
+        }
+    }
+}
+
+/// Basic template methods
+impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
+    /// Writes binary name of a Parser Object to the wrapped stream.
+    fn write_display_name(&mut self) {
+        debug!("HelpTemplate::write_display_name");
+
+        let display_name = wrap(
+            &self
+                .cmd
+                .get_display_name()
+                .unwrap_or_else(|| self.cmd.get_name())
+                .replace("{n}", "\n"),
+            self.term_w,
+        );
+        self.writer.push_string(display_name);
+    }
+
+    /// Writes binary name of a Parser Object to the wrapped stream.
+    #[cfg(not(feature = "unstable-v5"))]
+    fn write_bin_name(&mut self) {
+        debug!("HelpTemplate::write_bin_name");
+
+        let bin_name = if let Some(bn) = self.cmd.get_bin_name() {
+            if bn.contains(' ') {
+                // In case we're dealing with subcommands i.e. git mv is translated to git-mv
+                bn.replace(' ', "-")
+            } else {
+                wrap(&self.cmd.get_name().replace("{n}", "\n"), self.term_w)
+            }
+        } else {
+            wrap(&self.cmd.get_name().replace("{n}", "\n"), self.term_w)
+        };
+        self.writer.push_string(bin_name);
+    }
+
+    fn write_version(&mut self) {
+        let version = self
+            .cmd
+            .get_version()
+            .or_else(|| self.cmd.get_long_version());
+        if let Some(output) = version {
+            self.writer.push_string(wrap(output, self.term_w));
+        }
+    }
+
+    fn write_author(&mut self, before_new_line: bool, after_new_line: bool) {
+        if let Some(author) = self.cmd.get_author() {
+            if before_new_line {
+                self.writer.push_str("\n");
+            }
+            self.writer.push_string(wrap(author, self.term_w));
+            if after_new_line {
+                self.writer.push_str("\n");
+            }
+        }
+    }
+
+    fn write_about(&mut self, before_new_line: bool, after_new_line: bool) {
+        let about = if self.use_long {
+            self.cmd.get_long_about().or_else(|| self.cmd.get_about())
+        } else {
+            self.cmd.get_about()
+        };
+        if let Some(output) = about {
+            if before_new_line {
+                self.writer.push_str("\n");
+            }
+            let mut output = output.clone();
+            output.replace_newline_var();
+            output.wrap(self.term_w);
+            self.writer.push_styled(&output);
+            if after_new_line {
+                self.writer.push_str("\n");
+            }
+        }
+    }
+
+    fn write_before_help(&mut self) {
+        debug!("HelpTemplate::write_before_help");
+        let before_help = if self.use_long {
+            self.cmd
+                .get_before_long_help()
+                .or_else(|| self.cmd.get_before_help())
+        } else {
+            self.cmd.get_before_help()
+        };
+        if let Some(output) = before_help {
+            let mut output = output.clone();
+            output.replace_newline_var();
+            output.wrap(self.term_w);
+            self.writer.push_styled(&output);
+            self.writer.push_str("\n\n");
+        }
+    }
+
+    fn write_after_help(&mut self) {
+        debug!("HelpTemplate::write_after_help");
+        let after_help = if self.use_long {
+            self.cmd
+                .get_after_long_help()
+                .or_else(|| self.cmd.get_after_help())
+        } else {
+            self.cmd.get_after_help()
+        };
+        if let Some(output) = after_help {
+            self.writer.push_str("\n\n");
+            let mut output = output.clone();
+            output.replace_newline_var();
+            output.wrap(self.term_w);
+            self.writer.push_styled(&output);
+        }
+    }
+}
+
+/// Arg handling
+impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
+    /// Writes help for all arguments (options, flags, args, subcommands)
+    /// including titles of a Parser Object to the wrapped stream.
+    pub(crate) fn write_all_args(&mut self) {
+        debug!("HelpTemplate::write_all_args");
+        use std::fmt::Write as _;
+        let header = &self.styles.get_header();
+
+        let pos = self
+            .cmd
+            .get_positionals()
+            .filter(|a| a.get_help_heading().is_none())
+            .filter(|arg| should_show_arg(self.use_long, arg))
+            .collect::<Vec<_>>();
+        let non_pos = self
+            .cmd
+            .get_non_positionals()
+            .filter(|a| a.get_help_heading().is_none())
+            .filter(|arg| should_show_arg(self.use_long, arg))
+            .collect::<Vec<_>>();
+        let subcmds = self.cmd.has_visible_subcommands();
+
+        let custom_headings = self
+            .cmd
+            .get_arguments()
+            .filter_map(|arg| arg.get_help_heading())
+            .collect::<FlatSet<_>>();
+
+        let flatten = self.cmd.is_flatten_help_set();
+
+        let mut first = true;
+
+        if subcmds && !flatten {
+            if !first {
+                self.writer.push_str("\n\n");
+            }
+            first = false;
+            let default_help_heading = Str::from("Commands");
+            let help_heading = self
+                .cmd
+                .get_subcommand_help_heading()
+                .unwrap_or(&default_help_heading);
+            let _ = write!(
+                self.writer,
+                "{}{help_heading}:{}\n",
+                header.render(),
+                header.render_reset()
+            );
+
+            self.write_subcommands(self.cmd);
+        }
+
+        if !pos.is_empty() {
+            if !first {
+                self.writer.push_str("\n\n");
+            }
+            first = false;
+            // Write positional args if any
+            let help_heading = "Arguments";
+            let _ = write!(
+                self.writer,
+                "{}{help_heading}:{}\n",
+                header.render(),
+                header.render_reset()
+            );
+            self.write_args(&pos, "Arguments", positional_sort_key);
+        }
+
+        if !non_pos.is_empty() {
+            if !first {
+                self.writer.push_str("\n\n");
+            }
+            first = false;
+            let help_heading = "Options";
+            let _ = write!(
+                self.writer,
+                "{}{help_heading}:{}\n",
+                header.render(),
+                header.render_reset()
+            );
+            self.write_args(&non_pos, "Options", option_sort_key);
+        }
+        if !custom_headings.is_empty() {
+            for heading in custom_headings {
+                let args = self
+                    .cmd
+                    .get_arguments()
+                    .filter(|a| {
+                        if let Some(help_heading) = a.get_help_heading() {
+                            return help_heading == heading;
+                        }
+                        false
+                    })
+                    .filter(|arg| should_show_arg(self.use_long, arg))
+                    .collect::<Vec<_>>();
+
+                if !args.is_empty() {
+                    if !first {
+                        self.writer.push_str("\n\n");
+                    }
+                    first = false;
+                    let _ = write!(
+                        self.writer,
+                        "{}{heading}:{}\n",
+                        header.render(),
+                        header.render_reset()
+                    );
+                    self.write_args(&args, heading, option_sort_key);
+                }
+            }
+        }
+        if subcmds && flatten {
+            let mut cmd = self.cmd.clone();
+            cmd.build();
+            self.write_flat_subcommands(&cmd, &mut first);
+        }
+    }
+
+    /// Sorts arguments by length and display order and write their help to the wrapped stream.
+    fn write_args(&mut self, args: &[&Arg], _category: &str, sort_key: ArgSortKey) {
+        debug!("HelpTemplate::write_args {_category}");
+        // The shortest an arg can legally be is 2 (i.e. '-x')
+        let mut longest = 2;
+        let mut ord_v = Vec::new();
+
+        // Determine the longest
+        for &arg in args.iter().filter(|arg| {
+            // If it's NextLineHelp we don't care to compute how long it is because it may be
+            // NextLineHelp on purpose simply *because* it's so long and would throw off all other
+            // args alignment
+            should_show_arg(self.use_long, arg)
+        }) {
+            if longest_filter(arg) {
+                longest = longest.max(display_width(&arg.to_string()));
+                debug!(
+                    "HelpTemplate::write_args: arg={:?} longest={}",
+                    arg.get_id(),
+                    longest
+                );
+            }
+
+            let key = (sort_key)(arg);
+            ord_v.push((key, arg));
+        }
+        ord_v.sort_by(|a, b| a.0.cmp(&b.0));
+
+        let next_line_help = self.will_args_wrap(args, longest);
+
+        for (i, (_, arg)) in ord_v.iter().enumerate() {
+            if i != 0 {
+                self.writer.push_str("\n");
+                if next_line_help && self.use_long {
+                    self.writer.push_str("\n");
+                }
+            }
+            self.write_arg(arg, next_line_help, longest);
+        }
+    }
+
+    /// Writes help for an argument to the wrapped stream.
+    fn write_arg(&mut self, arg: &Arg, next_line_help: bool, longest: usize) {
+        let spec_vals = &self.spec_vals(arg);
+
+        self.writer.push_str(TAB);
+        self.short(arg);
+        self.long(arg);
+        self.writer
+            .push_styled(&arg.stylize_arg_suffix(self.styles, None));
+        self.align_to_about(arg, next_line_help, longest);
+
+        let about = if self.use_long {
+            arg.get_long_help()
+                .or_else(|| arg.get_help())
+                .unwrap_or_default()
+        } else {
+            arg.get_help()
+                .or_else(|| arg.get_long_help())
+                .unwrap_or_default()
+        };
+
+        self.help(Some(arg), about, spec_vals, next_line_help, longest);
+    }
+
+    /// Writes argument's short command to the wrapped stream.
+    fn short(&mut self, arg: &Arg) {
+        debug!("HelpTemplate::short");
+        use std::fmt::Write as _;
+        let literal = &self.styles.get_literal();
+
+        if let Some(s) = arg.get_short() {
+            let _ = write!(
+                self.writer,
+                "{}-{s}{}",
+                literal.render(),
+                literal.render_reset()
+            );
+        } else if arg.get_long().is_some() {
+            self.writer.push_str("    ");
+        }
+    }
+
+    /// Writes argument's long command to the wrapped stream.
+    fn long(&mut self, arg: &Arg) {
+        debug!("HelpTemplate::long");
+        use std::fmt::Write as _;
+        let literal = &self.styles.get_literal();
+
+        if let Some(long) = arg.get_long() {
+            if arg.get_short().is_some() {
+                self.writer.push_str(", ");
+            }
+            let _ = write!(
+                self.writer,
+                "{}--{long}{}",
+                literal.render(),
+                literal.render_reset()
+            );
+        }
+    }
+
+    /// Write alignment padding between arg's switches/values and its about message.
+    fn align_to_about(&mut self, arg: &Arg, next_line_help: bool, longest: usize) {
+        debug!(
+            "HelpTemplate::align_to_about: arg={}, next_line_help={}, longest={}",
+            arg.get_id(),
+            next_line_help,
+            longest
+        );
+        let padding = if self.use_long || next_line_help {
+            // long help prints messages on the next line so it doesn't need to align text
+            debug!("HelpTemplate::align_to_about: printing long help so skip alignment");
+            0
+        } else if !arg.is_positional() {
+            let self_len = display_width(&arg.to_string());
+            // Since we're writing spaces from the tab point we first need to know if we
+            // had a long and short, or just short
+            let padding = if arg.get_long().is_some() {
+                // Only account 4 after the val
+                TAB_WIDTH
+            } else {
+                // Only account for ', --' + 4 after the val
+                TAB_WIDTH + 4
+            };
+            let spcs = longest + padding - self_len;
+            debug!(
+                "HelpTemplate::align_to_about: positional=false arg_len={self_len}, spaces={spcs}"
+            );
+
+            spcs
+        } else {
+            let self_len = display_width(&arg.to_string());
+            let padding = TAB_WIDTH;
+            let spcs = longest + padding - self_len;
+            debug!(
+                "HelpTemplate::align_to_about: positional=true arg_len={self_len}, spaces={spcs}",
+            );
+
+            spcs
+        };
+
+        self.write_padding(padding);
+    }
+
+    /// Writes argument's help to the wrapped stream.
+    fn help(
+        &mut self,
+        arg: Option<&Arg>,
+        about: &StyledStr,
+        spec_vals: &str,
+        next_line_help: bool,
+        longest: usize,
+    ) {
+        debug!("HelpTemplate::help");
+        use std::fmt::Write as _;
+        let literal = &self.styles.get_literal();
+
+        // Is help on next line, if so then indent
+        if next_line_help {
+            debug!("HelpTemplate::help: Next Line...{next_line_help:?}");
+            self.writer.push_str("\n");
+            self.writer.push_str(TAB);
+            self.writer.push_str(NEXT_LINE_INDENT);
+        }
+
+        let spaces = if next_line_help {
+            TAB.len() + NEXT_LINE_INDENT.len()
+        } else if let Some(true) = arg.map(|a| a.is_positional()) {
+            longest + TAB_WIDTH * 2
+        } else {
+            longest + TAB_WIDTH * 2 + 4 // See `fn short` for the 4
+        };
+        let trailing_indent = spaces; // Don't indent any further than the first line is indented
+        let trailing_indent = self.get_spaces(trailing_indent);
+
+        let mut help = about.clone();
+        help.replace_newline_var();
+        if !spec_vals.is_empty() {
+            if !help.is_empty() {
+                let sep = if self.use_long && arg.is_some() {
+                    "\n\n"
+                } else {
+                    " "
+                };
+                help.push_str(sep);
+            }
+            help.push_str(spec_vals);
+        }
+        let avail_chars = self.term_w.saturating_sub(spaces);
+        debug!(
+            "HelpTemplate::help: help_width={}, spaces={}, avail={}",
+            spaces,
+            help.display_width(),
+            avail_chars
+        );
+        help.wrap(avail_chars);
+        help.indent("", &trailing_indent);
+        let help_is_empty = help.is_empty();
+        self.writer.push_styled(&help);
+        if let Some(arg) = arg {
+            if !arg.is_hide_possible_values_set() && self.use_long_pv(arg) {
+                const DASH_SPACE: usize = "- ".len();
+                let possible_vals = arg.get_possible_values();
+                if !possible_vals.is_empty() {
+                    debug!("HelpTemplate::help: Found possible vals...{possible_vals:?}");
+                    let longest = possible_vals
+                        .iter()
+                        .filter(|f| !f.is_hide_set())
+                        .map(|f| display_width(f.get_name()))
+                        .max()
+                        .expect("Only called with possible value");
+
+                    let spaces = spaces + TAB_WIDTH - DASH_SPACE;
+                    let trailing_indent = spaces + DASH_SPACE;
+                    let trailing_indent = self.get_spaces(trailing_indent);
+
+                    if !help_is_empty {
+                        let _ = write!(self.writer, "\n\n{:spaces$}", "");
+                    }
+                    self.writer.push_str("Possible values:");
+                    for pv in possible_vals.iter().filter(|pv| !pv.is_hide_set()) {
+                        let name = pv.get_name();
+
+                        let mut descr = StyledStr::new();
+                        let _ = write!(
+                            &mut descr,
+                            "{}{name}{}",
+                            literal.render(),
+                            literal.render_reset()
+                        );
+                        if let Some(help) = pv.get_help() {
+                            debug!("HelpTemplate::help: Possible Value help");
+                            // To align help messages
+                            let padding = longest - display_width(name);
+                            let _ = write!(&mut descr, ": {:padding$}", "");
+                            descr.push_styled(help);
+                        }
+
+                        let avail_chars = if self.term_w > trailing_indent.len() {
+                            self.term_w - trailing_indent.len()
+                        } else {
+                            usize::MAX
+                        };
+                        descr.replace_newline_var();
+                        descr.wrap(avail_chars);
+                        descr.indent("", &trailing_indent);
+
+                        let _ = write!(self.writer, "\n{:spaces$}- ", "",);
+                        self.writer.push_styled(&descr);
+                    }
+                }
+            }
+        }
+    }
+
+    /// Will use next line help on writing args.
+    fn will_args_wrap(&self, args: &[&Arg], longest: usize) -> bool {
+        args.iter()
+            .filter(|arg| should_show_arg(self.use_long, arg))
+            .any(|arg| {
+                let spec_vals = &self.spec_vals(arg);
+                self.arg_next_line_help(arg, spec_vals, longest)
+            })
+    }
+
+    fn arg_next_line_help(&self, arg: &Arg, spec_vals: &str, longest: usize) -> bool {
+        if self.next_line_help || arg.is_next_line_help_set() || self.use_long {
+            // setting_next_line
+            true
+        } else {
+            // force_next_line
+            let h = arg.get_help().unwrap_or_default();
+            let h_w = h.display_width() + display_width(spec_vals);
+            let taken = if arg.is_positional() {
+                longest + TAB_WIDTH * 2
+            } else {
+                longest + TAB_WIDTH * 2 + 4 // See `fn short` for the 4
+            };
+            self.term_w >= taken
+                && (taken as f32 / self.term_w as f32) > 0.40
+                && h_w > (self.term_w - taken)
+        }
+    }
+
+    fn spec_vals(&self, a: &Arg) -> String {
+        debug!("HelpTemplate::spec_vals: a={a}");
+        let mut spec_vals = Vec::new();
+        #[cfg(feature = "env")]
+        if let Some(ref env) = a.env {
+            if !a.is_hide_env_set() {
+                debug!(
+                    "HelpTemplate::spec_vals: Found environment variable...[{:?}:{:?}]",
+                    env.0, env.1
+                );
+                let env_val = if !a.is_hide_env_values_set() {
+                    format!(
+                        "={}",
+                        env.1
+                            .as_ref()
+                            .map(|s| s.to_string_lossy())
+                            .unwrap_or_default()
+                    )
+                } else {
+                    Default::default()
+                };
+                let env_info = format!("[env: {}{}]", env.0.to_string_lossy(), env_val);
+                spec_vals.push(env_info);
+            }
+        }
+        if a.is_takes_value_set() && !a.is_hide_default_value_set() && !a.default_vals.is_empty() {
+            debug!(
+                "HelpTemplate::spec_vals: Found default value...[{:?}]",
+                a.default_vals
+            );
+
+            let pvs = a
+                .default_vals
+                .iter()
+                .map(|pvs| pvs.to_string_lossy())
+                .map(|pvs| {
+                    if pvs.contains(char::is_whitespace) {
+                        Cow::from(format!("{pvs:?}"))
+                    } else {
+                        pvs
+                    }
+                })
+                .collect::<Vec<_>>()
+                .join(" ");
+
+            spec_vals.push(format!("[default: {pvs}]"));
+        }
+
+        let als = a
+            .aliases
+            .iter()
+            .filter(|&als| als.1) // visible
+            .map(|als| als.0.as_str()) // name
+            .collect::<Vec<_>>()
+            .join(", ");
+        if !als.is_empty() {
+            debug!("HelpTemplate::spec_vals: Found aliases...{:?}", a.aliases);
+            spec_vals.push(format!("[aliases: {als}]"));
+        }
+
+        let als = a
+            .short_aliases
+            .iter()
+            .filter(|&als| als.1) // visible
+            .map(|&als| als.0.to_string()) // name
+            .collect::<Vec<_>>()
+            .join(", ");
+        if !als.is_empty() {
+            debug!(
+                "HelpTemplate::spec_vals: Found short aliases...{:?}",
+                a.short_aliases
+            );
+            spec_vals.push(format!("[short aliases: {als}]"));
+        }
+
+        if !a.is_hide_possible_values_set() && !self.use_long_pv(a) {
+            let possible_vals = a.get_possible_values();
+            if !possible_vals.is_empty() {
+                debug!("HelpTemplate::spec_vals: Found possible vals...{possible_vals:?}");
+
+                let pvs = possible_vals
+                    .iter()
+                    .filter_map(PossibleValue::get_visible_quoted_name)
+                    .collect::<Vec<_>>()
+                    .join(", ");
+
+                spec_vals.push(format!("[possible values: {pvs}]"));
+            }
+        }
+        let connector = if self.use_long { "\n" } else { " " };
+        spec_vals.join(connector)
+    }
+
+    fn get_spaces(&self, n: usize) -> String {
+        " ".repeat(n)
+    }
+
+    fn write_padding(&mut self, amount: usize) {
+        use std::fmt::Write as _;
+        let _ = write!(self.writer, "{:amount$}", "");
+    }
+
+    fn use_long_pv(&self, arg: &Arg) -> bool {
+        self.use_long
+            && arg
+                .get_possible_values()
+                .iter()
+                .any(PossibleValue::should_show_help)
+    }
+}
+
+/// Subcommand handling
+impl<'cmd, 'writer> HelpTemplate<'cmd, 'writer> {
+    /// Writes help for subcommands of a Parser Object to the wrapped stream.
+    fn write_flat_subcommands(&mut self, cmd: &Command, first: &mut bool) {
+        debug!(
+            "HelpTemplate::write_flat_subcommands, cmd={}, first={}",
+            cmd.get_name(),
+            *first
+        );
+        use std::fmt::Write as _;
+        let header = &self.styles.get_header();
+
+        let mut ord_v = Vec::new();
+        for subcommand in cmd
+            .get_subcommands()
+            .filter(|subcommand| should_show_subcommand(subcommand))
+        {
+            ord_v.push((
+                subcommand.get_display_order(),
+                subcommand.get_name(),
+                subcommand,
+            ));
+        }
+        ord_v.sort_by(|a, b| (a.0, &a.1).cmp(&(b.0, &b.1)));
+        for (_, _, subcommand) in ord_v {
+            if !*first {
+                self.writer.push_str("\n\n");
+            }
+            *first = false;
+
+            let heading = subcommand.get_usage_name_fallback();
+            let about = subcommand
+                .get_about()
+                .or_else(|| subcommand.get_long_about())
+                .unwrap_or_default();
+
+            let _ = write!(
+                self.writer,
+                "{}{heading}:{}\n",
+                header.render(),
+                header.render_reset()
+            );
+            if !about.is_empty() {
+                let _ = write!(self.writer, "{about}\n",);
+            }
+
+            let mut sub_help = HelpTemplate {
+                writer: self.writer,
+                cmd: subcommand,
+                styles: self.styles,
+                usage: self.usage,
+                next_line_help: self.next_line_help,
+                term_w: self.term_w,
+                use_long: self.use_long,
+            };
+            let args = subcommand
+                .get_arguments()
+                .filter(|arg| should_show_arg(self.use_long, arg) && !arg.is_global_set())
+                .collect::<Vec<_>>();
+            sub_help.write_args(&args, heading, option_sort_key);
+            if subcommand.is_flatten_help_set() {
+                sub_help.write_flat_subcommands(subcommand, first);
+            }
+        }
+    }
+
+    /// Writes help for subcommands of a Parser Object to the wrapped stream.
+    fn write_subcommands(&mut self, cmd: &Command) {
+        debug!("HelpTemplate::write_subcommands");
+        use std::fmt::Write as _;
+        let literal = &self.styles.get_literal();
+
+        // The shortest an arg can legally be is 2 (i.e. '-x')
+        let mut longest = 2;
+        let mut ord_v = Vec::new();
+        for subcommand in cmd
+            .get_subcommands()
+            .filter(|subcommand| should_show_subcommand(subcommand))
+        {
+            let mut styled = StyledStr::new();
+            let name = subcommand.get_name();
+            let _ = write!(
+                styled,
+                "{}{name}{}",
+                literal.render(),
+                literal.render_reset()
+            );
+            if let Some(short) = subcommand.get_short_flag() {
+                let _ = write!(
+                    styled,
+                    ", {}-{short}{}",
+                    literal.render(),
+                    literal.render_reset()
+                );
+            }
+            if let Some(long) = subcommand.get_long_flag() {
+                let _ = write!(
+                    styled,
+                    ", {}--{long}{}",
+                    literal.render(),
+                    literal.render_reset()
+                );
+            }
+            longest = longest.max(styled.display_width());
+            ord_v.push((subcommand.get_display_order(), styled, subcommand));
+        }
+        ord_v.sort_by(|a, b| (a.0, &a.1).cmp(&(b.0, &b.1)));
+
+        debug!("HelpTemplate::write_subcommands longest = {longest}");
+
+        let next_line_help = self.will_subcommands_wrap(cmd.get_subcommands(), longest);
+
+        for (i, (_, sc_str, sc)) in ord_v.into_iter().enumerate() {
+            if 0 < i {
+                self.writer.push_str("\n");
+            }
+            self.write_subcommand(sc_str, sc, next_line_help, longest);
+        }
+    }
+
+    /// Will use next line help on writing subcommands.
+    fn will_subcommands_wrap<'a>(
+        &self,
+        subcommands: impl IntoIterator<Item = &'a Command>,
+        longest: usize,
+    ) -> bool {
+        subcommands
+            .into_iter()
+            .filter(|&subcommand| should_show_subcommand(subcommand))
+            .any(|subcommand| {
+                let spec_vals = &self.sc_spec_vals(subcommand);
+                self.subcommand_next_line_help(subcommand, spec_vals, longest)
+            })
+    }
+
+    fn write_subcommand(
+        &mut self,
+        sc_str: StyledStr,
+        cmd: &Command,
+        next_line_help: bool,
+        longest: usize,
+    ) {
+        debug!("HelpTemplate::write_subcommand");
+
+        let spec_vals = &self.sc_spec_vals(cmd);
+
+        let about = cmd
+            .get_about()
+            .or_else(|| cmd.get_long_about())
+            .unwrap_or_default();
+
+        self.subcmd(sc_str, next_line_help, longest);
+        self.help(None, about, spec_vals, next_line_help, longest)
+    }
+
+    fn sc_spec_vals(&self, a: &Command) -> String {
+        debug!("HelpTemplate::sc_spec_vals: a={}", a.get_name());
+        let mut spec_vals = vec![];
+
+        let mut short_als = a
+            .get_visible_short_flag_aliases()
+            .map(|a| format!("-{a}"))
+            .collect::<Vec<_>>();
+        let als = a.get_visible_aliases().map(|s| s.to_string());
+        short_als.extend(als);
+        let all_als = short_als.join(", ");
+        if !all_als.is_empty() {
+            debug!(
+                "HelpTemplate::spec_vals: Found aliases...{:?}",
+                a.get_all_aliases().collect::<Vec<_>>()
+            );
+            debug!(
+                "HelpTemplate::spec_vals: Found short flag aliases...{:?}",
+                a.get_all_short_flag_aliases().collect::<Vec<_>>()
+            );
+            spec_vals.push(format!("[aliases: {all_als}]"));
+        }
+
+        spec_vals.join(" ")
+    }
+
+    fn subcommand_next_line_help(&self, cmd: &Command, spec_vals: &str, longest: usize) -> bool {
+        // Ignore `self.use_long` since subcommands are only shown as short help
+        if self.next_line_help {
+            // setting_next_line
+            true
+        } else {
+            // force_next_line
+            let h = cmd.get_about().unwrap_or_default();
+            let h_w = h.display_width() + display_width(spec_vals);
+            let taken = longest + TAB_WIDTH * 2;
+            self.term_w >= taken
+                && (taken as f32 / self.term_w as f32) > 0.40
+                && h_w > (self.term_w - taken)
+        }
+    }
+
+    /// Writes subcommand to the wrapped stream.
+    fn subcmd(&mut self, sc_str: StyledStr, next_line_help: bool, longest: usize) {
+        self.writer.push_str(TAB);
+        self.writer.push_styled(&sc_str);
+        if !next_line_help {
+            let width = sc_str.display_width();
+            let padding = longest + TAB_WIDTH - width;
+            self.write_padding(padding);
+        }
+    }
+}
+
+const NEXT_LINE_INDENT: &str = "        ";
+
+type ArgSortKey = fn(arg: &Arg) -> (usize, String);
+
+fn positional_sort_key(arg: &Arg) -> (usize, String) {
+    (arg.get_index().unwrap_or(0), String::new())
+}
+
+fn option_sort_key(arg: &Arg) -> (usize, String) {
+    // Formatting key like this to ensure that:
+    // 1. Argument has long flags are printed just after short flags.
+    // 2. For two args both have short flags like `-c` and `-C`, the
+    //    `-C` arg is printed just after the `-c` arg
+    // 3. For args without short or long flag, print them at last(sorted
+    //    by arg name).
+    // Example order: -a, -b, -B, -s, --select-file, --select-folder, -x
+
+    let key = if let Some(x) = arg.get_short() {
+        let mut s = x.to_ascii_lowercase().to_string();
+        s.push(if x.is_ascii_lowercase() { '0' } else { '1' });
+        s
+    } else if let Some(x) = arg.get_long() {
+        x.to_string()
+    } else {
+        let mut s = '{'.to_string();
+        s.push_str(arg.get_id().as_str());
+        s
+    };
+    (arg.get_display_order(), key)
+}
+
+pub(crate) fn dimensions() -> (Option<usize>, Option<usize>) {
+    #[cfg(not(feature = "wrap_help"))]
+    return (None, None);
+
+    #[cfg(feature = "wrap_help")]
+    terminal_size::terminal_size()
+        .map(|(w, h)| (Some(w.0.into()), Some(h.0.into())))
+        .unwrap_or_else(|| (parse_env("COLUMNS"), parse_env("LINES")))
+}
+
+#[cfg(feature = "wrap_help")]
+fn parse_env(var: &str) -> Option<usize> {
+    some!(some!(std::env::var_os(var)).to_str())
+        .parse::<usize>()
+        .ok()
+}
+
+fn should_show_arg(use_long: bool, arg: &Arg) -> bool {
+    debug!(
+        "should_show_arg: use_long={:?}, arg={}",
+        use_long,
+        arg.get_id()
+    );
+    if arg.is_hide_set() {
+        return false;
+    }
+    (!arg.is_hide_long_help_set() && use_long)
+        || (!arg.is_hide_short_help_set() && !use_long)
+        || arg.is_next_line_help_set()
+}
+
+fn should_show_subcommand(subcommand: &Command) -> bool {
+    !subcommand.is_hide_set()
+}
+
+fn longest_filter(arg: &Arg) -> bool {
+    arg.is_takes_value_set() || arg.get_long().is_some() || arg.get_short().is_none()
+}
+
+#[cfg(test)]
+mod test {
+    #[test]
+    #[cfg(feature = "wrap_help")]
+    fn wrap_help_last_word() {
+        use super::*;
+
+        let help = String::from("foo bar baz");
+        assert_eq!(wrap(&help, 5), "foo\nbar\nbaz");
+    }
+
+    #[test]
+    #[cfg(feature = "unicode")]
+    fn display_width_handles_non_ascii() {
+        use super::*;
+
+        // Popular Danish tongue-twister, the name of a fruit dessert.
+        let text = "rødgrød med fløde";
+        assert_eq!(display_width(text), 17);
+        // Note that the string width is smaller than the string
+        // length. This is due to the precomposed non-ASCII letters:
+        assert_eq!(text.len(), 20);
+    }
+
+    #[test]
+    #[cfg(feature = "unicode")]
+    fn display_width_handles_emojis() {
+        use super::*;
+
+        let text = "😂";
+        // There is a single `char`...
+        assert_eq!(text.chars().count(), 1);
+        // but it is double-width:
+        assert_eq!(display_width(text), 2);
+        // This is much less than the byte length:
+        assert_eq!(text.len(), 4);
+    }
+}