feat: added support for --generate-man command (#85)

src/config.rs

@@ -254,6 +254,8 @@ pub enum TrippyAction {
     PrintConfigTemplate,
     /// Generate shell completion and exit.
     PrintShellCompletions(Shell),
+    /// Generate a man page and exit.
+    PrintManPage,
 }
 
 impl TrippyAction {
@@ -266,6 +268,8 @@ impl TrippyAction {
             Self::PrintConfigTemplate
         } else if let Some(shell) = args.generate {
             Self::PrintShellCompletions(shell)
+        } else if args.generate_man {
+            Self::PrintManPage
         } else {
             Self::Trippy(TrippyConfig::from(args, platform)?)
         })
@@ -1609,6 +1613,7 @@ mod tests {
     #[test_case("trip --generate zsh", Ok(TrippyAction::PrintShellCompletions(Shell::Zsh)); "generate zsh shell completions")]
     #[test_case("trip --generate bash", Ok(TrippyAction::PrintShellCompletions(Shell::Bash)); "generate bash shell completions")]
     #[test_case("trip --generate foo", Err(anyhow!("error: one of the values isn't valid for an argument")); "generate invalid shell completions")]
+    #[test_case("trip --generate-man", Ok(TrippyAction::PrintManPage); "generate man page")]
     fn test_action(cmd: &str, expected: anyhow::Result<TrippyAction>) {
         compare(parse_action(cmd), expected);
     }

src/config/cmd.rs

@@ -15,7 +15,7 @@ use clap_complete::Shell;
 #[command(name = "trip", author, version, about, long_about = None, arg_required_else_help(true), styles=Styles::styled())]
 pub struct Args {
     /// A space delimited list of hostnames and IPs to trace
-    #[arg(required_unless_present_any(["print_tui_theme_items", "print_tui_binding_commands", "print_config_template", "generate"]))]
+    #[arg(required_unless_present_any(["print_tui_theme_items", "print_tui_binding_commands", "print_config_template", "generate", "generate_man"]))]
     pub targets: Vec<String>,
 
     /// Config file
@@ -240,6 +240,10 @@ pub struct Args {
     #[arg(long)]
     pub generate: Option<Shell>,
 
+    /// Generate ROFF man page
+    #[arg(long)]
+    pub generate_man: bool,
+
     /// Print a template toml config file and exit
     #[arg(long)]
     pub print_config_template: bool,

src/main.rs

@@ -60,6 +60,7 @@ fn main() -> anyhow::Result<()> {
         TrippyAction::PrintTuiThemeItems => print_tui_theme_items(),
         TrippyAction::PrintTuiBindingCommands => print_tui_binding_commands(),
         TrippyAction::PrintConfigTemplate => print_config_template(),
+        TrippyAction::PrintManPage => print_man_page()?,
         TrippyAction::PrintShellCompletions(shell) => print_shell_completions(shell)?,
     }
     Ok(())
@@ -102,6 +103,11 @@ fn print_shell_completions(shell: Shell) -> anyhow::Result<()> {
     process::exit(0);
 }
 
+fn print_man_page() -> anyhow::Result<()> {
+    println!("{}", man_page()?);
+    process::exit(0);
+}
+
 /// Start the DNS resolver.
 fn start_dns_resolver(cfg: &TrippyConfig) -> anyhow::Result<DnsResolver> {
     Ok(DnsResolver::start(trippy::dns::Config::new(
@@ -467,6 +473,13 @@ fn shell_completions(shell: Shell) -> anyhow::Result<String> {
     Ok(String::from_utf8(buffer)?)
 }
 
+fn man_page() -> anyhow::Result<String> {
+    let cmd = Args::command();
+    let mut buffer: Vec<u8> = vec![];
+    clap_mangen::Man::new(cmd).render(&mut buffer)?;
+    Ok(String::from_utf8(buffer)?)
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;
@@ -479,6 +492,7 @@ mod tests {
     #[test_case(include_str!("../test_resources/config/completions_fish.txt"), &shell_completions(Shell::Fish).unwrap(); "generate fish shell completions")]
     #[test_case(include_str!("../test_resources/config/completions_powershell.txt"), &shell_completions(Shell::PowerShell).unwrap(); "generate powershell shell completions")]
     #[test_case(include_str!("../test_resources/config/completions_zsh.txt"), &shell_completions(Shell::Zsh).unwrap(); "generate zsh shell completions")]
+    #[test_case(include_str!("../test_resources/config/trip.1"), &man_page().unwrap(); "generate man page")]
     fn test_output(expected: &str, actual: &str) {
         if remove_whitespace(actual.to_string()) != remove_whitespace(expected.to_string()) {
             pretty_assertions::assert_eq!(actual, expected);

test_resources/config/completions_bash.txt

@@ -19,7 +19,7 @@ _trip() {
 
     case "${cmd}" in
         trip)
-            opts="-c -m -u -p -F -4 -6 -P -S -A -I -i -T -g -R -U -f -t -Q -e -r -y -z -a -M -s -C -G -v -h -V --config-file --mode --unprivileged --protocol --udp --tcp --icmp --addr-family --ipv4 --ipv6 --target-port --source-port --source-address --interface --min-round-duration --max-round-duration --grace-duration --initial-sequence --multipath-strategy --max-inflight --first-ttl --max-ttl --packet-size --payload-pattern --tos --icmp-extensions --read-timeout --dns-resolve-method --dns-resolve-all --dns-timeout --dns-lookup-as-info --tui-address-mode --tui-as-mode --tui-custom-columns --tui-icmp-extension-mode --tui-geoip-mode --tui-max-addrs --tui-max-samples --tui-max-flows --tui-preserve-screen --tui-refresh-rate --tui-privacy-max-ttl --tui-theme-colors --print-tui-theme-items --tui-key-bindings --print-tui-binding-commands --report-cycles --geoip-mmdb-file --generate --print-config-template --log-format --log-filter --log-span-events --verbose --help --version [TARGETS]..."
+            opts="-c -m -u -p -F -4 -6 -P -S -A -I -i -T -g -R -U -f -t -Q -e -r -y -z -a -M -s -C -G -v -h -V --config-file --mode --unprivileged --protocol --udp --tcp --icmp --addr-family --ipv4 --ipv6 --target-port --source-port --source-address --interface --min-round-duration --max-round-duration --grace-duration --initial-sequence --multipath-strategy --max-inflight --first-ttl --max-ttl --packet-size --payload-pattern --tos --icmp-extensions --read-timeout --dns-resolve-method --dns-resolve-all --dns-timeout --dns-lookup-as-info --tui-address-mode --tui-as-mode --tui-custom-columns --tui-icmp-extension-mode --tui-geoip-mode --tui-max-addrs --tui-max-samples --tui-max-flows --tui-preserve-screen --tui-refresh-rate --tui-privacy-max-ttl --tui-theme-colors --print-tui-theme-items --tui-key-bindings --print-tui-binding-commands --report-cycles --geoip-mmdb-file --generate --generate-man --print-config-template --log-format --log-filter --log-span-events --verbose --help --version [TARGETS]..."
             if [[ ${cur} == -* || ${COMP_CWORD} -eq 1 ]] ; then
                 COMPREPLY=( $(compgen -W "${opts}" -- "${cur}") )
                 return 0

test_resources/config/completions_elvish.txt

@@ -98,6 +98,7 @@ set edit:completion:arg-completer[trip] = {|@words|
             cand --tui-preserve-screen 'Preserve the screen on exit [default: false]'
             cand --print-tui-theme-items 'Print all TUI theme items and exit'
             cand --print-tui-binding-commands 'Print all TUI commands that can be bound and exit'
+            cand --generate-man 'Generate ROFF man page'
             cand --print-config-template 'Print a template toml config file and exit'
             cand -v 'Enable verbose debug logging'
             cand --verbose 'Enable verbose debug logging'

test_resources/config/completions_fish.txt

@@ -50,6 +50,7 @@ complete -c trip -s z -l dns-lookup-as-info -d 'Lookup autonomous system (AS) in
 complete -c trip -l tui-preserve-screen -d 'Preserve the screen on exit [default: false]'
 complete -c trip -l print-tui-theme-items -d 'Print all TUI theme items and exit'
 complete -c trip -l print-tui-binding-commands -d 'Print all TUI commands that can be bound and exit'
+complete -c trip -l generate-man -d 'Generate ROFF man page'
 complete -c trip -l print-config-template -d 'Print a template toml config file and exit'
 complete -c trip -s v -l verbose -d 'Enable verbose debug logging'
 complete -c trip -s h -l help -d 'Print help (see more with \'--help\')'

test_resources/config/completions_powershell.txt

@@ -101,6 +101,7 @@ Register-ArgumentCompleter -Native -CommandName 'trip' -ScriptBlock {
             [CompletionResult]::new('--tui-preserve-screen', 'tui-preserve-screen', [CompletionResultType]::ParameterName, 'Preserve the screen on exit [default: false]')
             [CompletionResult]::new('--print-tui-theme-items', 'print-tui-theme-items', [CompletionResultType]::ParameterName, 'Print all TUI theme items and exit')
             [CompletionResult]::new('--print-tui-binding-commands', 'print-tui-binding-commands', [CompletionResultType]::ParameterName, 'Print all TUI commands that can be bound and exit')
+            [CompletionResult]::new('--generate-man', 'generate-man', [CompletionResultType]::ParameterName, 'Generate ROFF man page')
             [CompletionResult]::new('--print-config-template', 'print-config-template', [CompletionResultType]::ParameterName, 'Print a template toml config file and exit')
             [CompletionResult]::new('-v', 'v', [CompletionResultType]::ParameterName, 'Enable verbose debug logging')
             [CompletionResult]::new('--verbose', 'verbose', [CompletionResultType]::ParameterName, 'Enable verbose debug logging')

test_resources/config/completions_zsh.txt

@@ -151,6 +151,7 @@ full\:"Display all event spans"))' \
 '--tui-preserve-screen[Preserve the screen on exit \[default\: false\]]' \
 '--print-tui-theme-items[Print all TUI theme items and exit]' \
 '--print-tui-binding-commands[Print all TUI commands that can be bound and exit]' \
+'--generate-man[Generate ROFF man page]' \
 '--print-config-template[Print a template toml config file and exit]' \
 '-v[Enable verbose debug logging]' \
 '--verbose[Enable verbose debug logging]' \