complete/zsh: improve --hyperlink-format completion

Also don't re-define helper functions if they exist.

Closes #3102

crates/core/flags/complete/rg.zsh

@@ -319,7 +319,7 @@ _rg() {
     '--field-context-separator[set string to delimit fields in context lines]'
     '--field-match-separator[set string to delimit fields in matching lines]'
     '--hostname-bin=[executable for getting system hostname]:hostname executable:_command_names -e'
-    '--hyperlink-format=[specify pattern for hyperlinks]:pattern'
+    '--hyperlink-format=[specify pattern for hyperlinks]: :_rg_hyperlink_formats'
     '--trace[show more verbose debug messages]'
     '--dfa-size-limit=[specify upper size limit of generated DFA]:DFA size (bytes)'
     "(1 stats)--files[show each file that would be searched (but don't search)]"
@@ -410,6 +410,7 @@ _rg() {
 }
 
 # Complete encodings
+(( $+functions[_rg_encodings] )) ||
 _rg_encodings() {
   local -a expl
   local -aU _encodings
@@ -422,6 +423,7 @@ _rg_encodings() {
 }
 
 # Complete file types
+(( $+functions[_rg_types] )) ||
 _rg_types() {
   local -a expl
   local -aU _types
@@ -435,6 +437,49 @@ _rg_types() {
   fi
 }
 
+# Complete hyperlink format-string aliases
+(( $+functions[_rg_hyperlink_format_aliases] )) ||
+_rg_hyperlink_format_aliases() {
+  _describe -t format-aliases 'hyperlink format alias' '(
+!HYPERLINK_ALIASES!
+  )'
+}
+
+# Complete custom hyperlink format strings
+(( $+functions[_rg_hyperlink_format_strings] )) ||
+_rg_hyperlink_format_strings() {
+  local op='{' ed='}'
+  local -a pfx sfx rmv
+
+  compquote op ed
+
+  sfx=( -S $ed )
+  rmv=( -r ${(q)ed[1]} )
+
+  compset -S "$op*"
+  compset -S "$ed*" && sfx=( -S '' )
+  compset -P "*$ed"
+  compset -p ${#PREFIX%$op*}
+  compset -P $op || pfx=( -P $op )
+
+  WSL_DISTRO_NAME=${WSL_DISTRO_NAME:-\$WSL_DISTRO_NAME} \
+  _describe -t format-variables 'hyperlink format variable' '(
+    path:"absolute path to file containing match (required)"
+    host:"system host name or output of --hostname-bin executable"
+    line:"line number of match"
+    column:"column of match (requires {line})"
+    wslprefix:"\"wsl$/$WSL_DISTRO_NAME\" (for WSL share)"
+  )' "${(@)pfx}" "${(@)sfx}" "${(@)rmv}"
+}
+
+# Complete hyperlink formats
+(( $+functions[_rg_hyperlink_formats] )) ||
+_rg_hyperlink_formats() {
+  _alternative \
+    'format-string-aliases: :_rg_hyperlink_format_aliases' \
+    'format-strings: :_rg_hyperlink_format_strings'
+}
+
 # Don't run the completion function when being sourced by itself.
 #
 # See https://github.com/BurntSushi/ripgrep/issues/2956

crates/core/flags/complete/zsh.rs

@@ -19,5 +19,14 @@ long as it meets criteria 3 and 4 above.
 
 /// Generate completions for zsh.
 pub(crate) fn generate() -> String {
-    include_str!("rg.zsh").replace("!ENCODINGS!", super::ENCODINGS.trim_end())
+    let hyperlink_alias_descriptions = grep::printer::hyperlink_aliases()
+        .iter()
+        .map(|alias| {
+            format!(r#"    {}:"{}""#, alias.name(), alias.description())
+        })
+        .collect::<Vec<String>>()
+        .join("\n");
+    include_str!("rg.zsh")
+        .replace("!ENCODINGS!", super::ENCODINGS.trim_end())
+        .replace("!HYPERLINK_ALIASES!", &hyperlink_alias_descriptions)
 }

crates/printer/src/hyperlink/aliases.rs

@@ -4,41 +4,84 @@ use crate::hyperlink::HyperlinkAlias;
 ///
 /// These need to be sorted by name.
 pub(super) const HYPERLINK_PATTERN_ALIASES: &[HyperlinkAlias] = &[
-    #[cfg(not(windows))]
-    prioritized_alias(0, "default", "file://{host}{path}"),
-    #[cfg(windows)]
-    prioritized_alias(0, "default", "file://{path}"),
-    alias("file", "file://{host}{path}"),
+    prioritized_alias(
+        0,
+        "default",
+        "RFC 8089 scheme (file://) (platform-aware)",
+        {
+            #[cfg(not(windows))]
+            {
+                "file://{host}{path}"
+            }
+            #[cfg(windows)]
+            {
+                "file://{path}"
+            }
+        },
+    ),
+    alias(
+        "file",
+        "RFC 8089 scheme (file://) with host",
+        "file://{host}{path}",
+    ),
     // https://github.com/misaki-web/grepp
-    alias("grep+", "grep+://{path}:{line}"),
-    alias("kitty", "file://{host}{path}#{line}"),
+    alias("grep+", "grep+ scheme (grep+://)", "grep+://{path}:{line}"),
+    alias(
+        "kitty",
+        "kitty-style RFC 8089 scheme (file://) with line number",
+        "file://{host}{path}#{line}",
+    ),
     // https://macvim.org/docs/gui_mac.txt.html#mvim%3A%2F%2F
     alias(
         "macvim",
+        "MacVim scheme (mvim://)",
         "mvim://open?url=file://{path}&line={line}&column={column}",
     ),
-    prioritized_alias(1, "none", ""),
+    prioritized_alias(1, "none", "disable hyperlinks", ""),
     // https://macromates.com/blog/2007/the-textmate-url-scheme/
     alias(
         "textmate",
+        "TextMate scheme (txmt://)",
         "txmt://open?url=file://{path}&line={line}&column={column}",
     ),
     // https://code.visualstudio.com/docs/editor/command-line#_opening-vs-code-with-urls
-    alias("vscode", "vscode://file{path}:{line}:{column}"),
-    alias("vscode-insiders", "vscode-insiders://file{path}:{line}:{column}"),
-    alias("vscodium", "vscodium://file{path}:{line}:{column}"),
+    alias(
+        "vscode",
+        "VS Code scheme (vscode://)",
+        "vscode://file{path}:{line}:{column}",
+    ),
+    alias(
+        "vscode-insiders",
+        "VS Code Insiders scheme (vscode-insiders://)",
+        "vscode-insiders://file{path}:{line}:{column}",
+    ),
+    alias(
+        "vscodium",
+        "VSCodium scheme (vscodium://)",
+        "vscodium://file{path}:{line}:{column}",
+    ),
 ];
 
 /// Creates a [`HyperlinkAlias`].
-const fn alias(name: &'static str, format: &'static str) -> HyperlinkAlias {
-    HyperlinkAlias { name, format, display_priority: None }
+const fn alias(
+    name: &'static str,
+    description: &'static str,
+    format: &'static str,
+) -> HyperlinkAlias {
+    HyperlinkAlias { name, description, format, display_priority: None }
 }
 
 /// Creates a [`HyperlinkAlias`] with a display priority.
 const fn prioritized_alias(
     priority: i16,
     name: &'static str,
+    description: &'static str,
     format: &'static str,
 ) -> HyperlinkAlias {
-    HyperlinkAlias { name, format, display_priority: Some(priority) }
+    HyperlinkAlias {
+        name,
+        description,
+        format,
+        display_priority: Some(priority),
+    }
 }

crates/printer/src/hyperlink/mod.rs

@@ -190,6 +190,7 @@ impl std::fmt::Display for HyperlinkFormat {
 #[derive(Clone, Debug)]
 pub struct HyperlinkAlias {
     name: &'static str,
+    description: &'static str,
     format: &'static str,
     display_priority: Option<i16>,
 }
@@ -200,6 +201,11 @@ impl HyperlinkAlias {
         self.name
     }
 
+    /// Returns a very short description of this hyperlink alias.
+    pub const fn description(&self) -> &str {
+        self.description
+    }
+
     /// Returns the display priority of this alias.
     ///
     /// If no priority is set, then `None` is returned.