Initial commit

internal/prompt/doc.go

@@ -0,0 +1,3 @@
+// Package prompt expands shell prompt templates by resolving variables like
+// %u (user), %h (host), and %w (working directory).
+package prompt

internal/prompt/parse.go

@@ -0,0 +1,40 @@
+package prompt
+
+import (
+	"os"
+	"strings"
+
+	"gosh/internal/paths"
+)
+
+func cwd(abbr bool) string {
+	cwd, err := os.Getwd()
+	if err != nil {
+		return "?"
+	}
+
+	if abbr {
+		cwd = paths.AbbreviateHome(cwd)
+	}
+	return cwd
+}
+
+func hostname() string {
+	hostname, err := os.Hostname()
+	if err != nil {
+		return "?"
+	}
+	return hostname
+}
+
+func resolve(input, variable, value string) string {
+	return strings.ReplaceAll(input, variable, value)
+}
+
+func Parse(prompt string) string {
+	prompt = resolve(prompt, "%w", cwd(true))
+	prompt = resolve(prompt, "%W", cwd(false))
+	prompt = resolve(prompt, "%h", hostname())
+	prompt = resolve(prompt, "%u", os.ExpandEnv("$USER"))
+	return prompt
+}