@@ -0,0 +1,44 @@
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"os"
+
+	"github.com/yuin/goldmark"
+	"go.alanpearce.eu/searchix/internal/nixdocs/filepath"
+)
+
+func main() {
+	// Create a new Goldmark instance with our file path extension
+	md := goldmark.New(
+		goldmark.WithExtensions(
+			filepath.New(),
+		),
+	)
+
+	// Some example Markdown content with file path references
+	src := []byte(`
+# File Path References Example
+
+System configuration files like {file}` + "`/etc/passwd`" + ` and {file}` + "`/etc/shadow`" +
+		` contain user account information.
+
+The {file}` + "`/etc/fstab`" + ` file defines the file systems to be mounted.
+
+Configuration files are often found in the following locations:
+- {file}` + "`/etc/`" + ` for system-wide configuration
+- {file}` + "`~/.config/`" + ` for user-specific configuration
+- {file}` + "`/usr/local/etc/`" + ` for locally installed software
+`)
+
+	// Convert the markdown to HTML
+	var buf bytes.Buffer
+	if err := md.Convert(src, &buf); err != nil {
+		fmt.Println("Conversion error:", err)
+		os.Exit(1)
+	}
+
+	// Print the HTML output
+	fmt.Println(buf.String())
+}

@@ -0,0 +1,172 @@
+//nolint:wrapcheck
+package filepath
+
+import (
+	"bytes"
+
+	"github.com/yuin/goldmark"
+	"github.com/yuin/goldmark/ast"
+	"github.com/yuin/goldmark/parser"
+	"github.com/yuin/goldmark/renderer"
+	"github.com/yuin/goldmark/renderer/html"
+	"github.com/yuin/goldmark/text"
+	"github.com/yuin/goldmark/util"
+)
+
+// Node represents a file path reference node in markdown AST.
+type Node struct {
+	ast.BaseInline
+	FilePath []byte
+}
+
+// Inline implements ast.Inline interface.
+func (n *Node) Inline() bool {
+	return true
+}
+
+// Kind implements ast.Node.Kind interface.
+func (n *Node) Kind() ast.NodeKind {
+	return KindFilePath
+}
+
+// Dump implements ast.Node.Dump interface.
+func (n *Node) Dump(source []byte, level int) {
+	ast.DumpHelper(n, source, level, map[string]string{
+		"FilePath": string(n.FilePath),
+	}, nil)
+}
+
+// KindFilePath is a NodeKind for file path nodes.
+var KindFilePath = ast.NewNodeKind("FilePath")
+
+// Parser is a Goldmark inline parser for parsing file path nodes.
+//
+// File path references have the format {file}`/etc/passwd` which will be rendered as
+// a span with the file path.
+type Parser struct{}
+
+var _ parser.InlineParser = (*Parser)(nil)
+
+// Trigger reports characters that trigger this parser.
+func (*Parser) Trigger() []byte {
+	return []byte{'{'}
+}
+
+// Parse parses a file path node.
+func (p *Parser) Parse(_ ast.Node, block text.Reader, _ parser.Context) ast.Node {
+	line, segment := block.PeekLine()
+
+	// Check if we have enough characters for {file}`
+	if len(line) < 7 || line[0] != '{' {
+		return nil
+	}
+
+	// Check for {file}` prefix
+	if !bytes.HasPrefix(line, []byte("{file}`")) {
+		return nil
+	}
+
+	// Skip the {file}` prefix
+	line = line[7:]
+	start := segment.Start + 7
+
+	// Find the closing backtick
+	endPos := bytes.IndexByte(line, '`')
+	if endPos < 0 {
+		return nil
+	}
+
+	// Extract the file path
+	filePath := line[:endPos]
+	if len(filePath) == 0 {
+		return nil
+	}
+
+	// Create the node
+	n := &Node{
+		FilePath: filePath,
+	}
+
+	// Set the text segment to include the entire {file}`path` text
+	textSegment := text.NewSegment(segment.Start, start+endPos+1)
+	n.AppendChild(n, ast.NewTextSegment(textSegment))
+
+	// Advance the reader past this node
+	block.Advance(7 + endPos + 1) // {file}` + path + `
+
+	return n
+}
+
+// HTMLRenderer is a renderer for file path nodes.
+type HTMLRenderer struct {
+	html.Config
+}
+
+// NewHTMLRenderer returns a new HTMLRenderer.
+func NewHTMLRenderer(opts ...html.Option) renderer.NodeRenderer {
+	r := &HTMLRenderer{
+		Config: html.NewConfig(),
+	}
+	for _, opt := range opts {
+		opt.SetHTMLOption(&r.Config)
+	}
+
+	return r
+}
+
+// RegisterFuncs implements renderer.NodeRenderer.RegisterFuncs.
+func (r *HTMLRenderer) RegisterFuncs(reg renderer.NodeRendererFuncRegisterer) {
+	reg.Register(KindFilePath, r.renderFilePath)
+}
+
+func (r *HTMLRenderer) renderFilePath(
+	w util.BufWriter,
+	source []byte, //nolint:revive
+	node ast.Node,
+	entering bool,
+) (ast.WalkStatus, error) {
+	if !entering {
+		return ast.WalkContinue, nil
+	}
+
+	n := node.(*Node)
+
+	if _, err := w.WriteString(`<span class="file-path">`); err != nil {
+		return ast.WalkStop, err
+	}
+
+	if _, err := w.Write(n.FilePath); err != nil {
+		return ast.WalkStop, err
+	}
+
+	if _, err := w.WriteString("</span>"); err != nil {
+		return ast.WalkStop, err
+	}
+
+	return ast.WalkSkipChildren, nil
+}
+
+// Extension is a goldmark extension for file path references.
+type Extension struct{}
+
+// Extend implements goldmark.Extender.Extend.
+func (e *Extension) Extend(m goldmark.Markdown) {
+	// Register the parser
+	m.Parser().AddOptions(
+		parser.WithInlineParsers(
+			util.Prioritized(new(Parser), 100),
+		),
+	)
+
+	// Register the renderer
+	m.Renderer().AddOptions(
+		renderer.WithNodeRenderers(
+			util.Prioritized(NewHTMLRenderer(), 500),
+		),
+	)
+}
+
+// New returns a new file path extension.
+func New() goldmark.Extender {
+	return &Extension{}
+}

@@ -0,0 +1,79 @@
+package filepath
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/yuin/goldmark"
+)
+
+func TestFilePathExtension(t *testing.T) {
+	markdown := goldmark.New(
+		goldmark.WithExtensions(
+			New(),
+		),
+	)
+
+	tests := []struct {
+		name     string
+		input    string
+		expected string
+	}{
+		{
+			name:     "basic file path reference",
+			input:    "{file}`/etc/passwd`",
+			expected: "<p><span class=\"file-path\">/etc/passwd</span></p>\n",
+		},
+		{
+			name:  "file path reference in sentence",
+			input: "The configuration file {file}`/etc/fstab` contains file system information.",
+			expected: "<p>The configuration file <span class=\"file-path\">/etc/fstab</span>" +
+				" contains file system information.</p>\n",
+		},
+		{
+			name:  "multiple file path references",
+			input: "Both {file}`/etc/hosts` and {file}`/etc/resolv.conf` define DNS settings.",
+			expected: "<p>Both <span class=\"file-path\">/etc/hosts</span> and <span class=\"file-path\">" +
+				"/etc/resolv.conf</span> define DNS settings.</p>\n",
+		},
+		{
+			name:     "incomplete file path reference - no closing backtick",
+			input:    "{file}`/missing/backtick",
+			expected: "<p>{file}`/missing/backtick</p>\n",
+		},
+		{
+			name:     "incomplete file path reference - empty path",
+			input:    "{file}``",
+			expected: "<p>{file}``</p>\n",
+		},
+		{
+			name:  "file path reference with code block",
+			input: "Edit {file}`~/.bashrc` using your favorite `text editor`.",
+			expected: "<p>Edit <span class=\"file-path\">~/.bashrc</span> " +
+				"using your favorite <code>text editor</code>.</p>\n",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			var buf bytes.Buffer
+			if err := markdown.Convert([]byte(test.input), &buf); err != nil {
+				t.Fatalf("Failed to convert markdown: %v", err)
+			}
+
+			if got := buf.String(); got != test.expected {
+				t.Errorf("Expected:\n%q\nGot:\n%q", test.expected, got)
+			}
+		})
+	}
+}
+
+func TestFilePathNodeKind(t *testing.T) {
+	n := &Node{}
+	if kind := n.Kind(); kind != KindFilePath {
+		t.Errorf("Expected node kind %v, got %v", KindFilePath, kind)
+	}
+	if !n.Inline() {
+		t.Error("Expected node to be inline")
+	}
+}

@@ -7,6 +7,7 @@ "github.com/yuin/goldmark/extension"
 
 	"go.alanpearce.eu/searchix/internal/nixdocs/command"
 	"go.alanpearce.eu/searchix/internal/nixdocs/envvar"
+	"go.alanpearce.eu/searchix/internal/nixdocs/filepath"
 	"go.alanpearce.eu/searchix/internal/nixdocs/option"
 	"go.alanpearce.eu/searchix/internal/nixdocs/optlink"
 	"go.alanpearce.eu/searchix/internal/nixdocs/variable"
@@ -21,5 +22,6 @@ option.New(),
 		command.New(),
 		envvar.New(),
 		variable.New(),
+		filepath.New(),
 	)
 }