swaptop 1.0.0

htop-style view of which processes are using swap, and how.

config.go

@@ -0,0 +1,69 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"strconv"
+	"strings"
+)
+
+// config is ~/.config/swaptop/config: "key = value" lines, rewritten on exit.
+type config struct {
+	Sort     string
+	HideZero bool
+	FullCmd  bool
+	Tree     bool
+	Refresh  float64 // seconds
+}
+
+var defaults = config{Sort: "SWAP", HideZero: true, Refresh: 2}
+
+func configPath() string {
+	dir := os.Getenv("XDG_CONFIG_HOME")
+	if dir == "" {
+		home, _ := os.UserHomeDir()
+		dir = filepath.Join(home, ".config")
+	}
+	return filepath.Join(dir, "swaptop", "config")
+}
+
+func loadConfig() config {
+	c := defaults
+	b, err := os.ReadFile(configPath())
+	if err != nil {
+		return c
+	}
+	for _, line := range strings.Split(string(b), "\n") {
+		k, v, ok := strings.Cut(line, "=")
+		if !ok || strings.HasPrefix(strings.TrimSpace(line), "#") {
+			continue
+		}
+		k, v = strings.TrimSpace(k), strings.TrimSpace(v)
+		switch k {
+		case "sort":
+			c.Sort = strings.ToUpper(v)
+		case "hide_zero":
+			c.HideZero = v == "true"
+		case "full_cmd":
+			c.FullCmd = v == "true"
+		case "tree":
+			c.Tree = v == "true"
+		case "refresh":
+			if f, err := strconv.ParseFloat(v, 64); err == nil && f > 0 {
+				c.Refresh = f
+			}
+		}
+	}
+	return c
+}
+
+func (c config) save() error {
+	p := configPath()
+	if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
+		return err
+	}
+	return os.WriteFile(p, []byte(fmt.Sprintf(
+		"# swaptop configuration; rewritten when swaptop exits. See swaptop(1).\nsort = %s\nhide_zero = %t\nfull_cmd = %t\ntree = %t\nrefresh = %g\n",
+		c.Sort, c.HideZero, c.FullCmd, c.Tree, c.Refresh)), 0o644)
+}