feat: use fmt.Sprintf to generate file paths

CHANGELOG.md

@@ -11,6 +11,10 @@ Which is based on [Keep A Changelog](http://keepachangelog.com/)
 
 - A comment for all functions
 
+### Changed
+
+- Use fmt.Sprintf to generate file paths
+
 ### Removed
 
 - Duplicate array interval

proc.go

@@ -18,6 +18,7 @@
 package main
 
 import (
+  "fmt"
   "strings"
   "regexp"
   "io/ioutil"
@@ -43,7 +44,7 @@ func NewProc(pid int) *Proc {
 
 // CmdLine return the command line for a process
 func CmdLine(pid int) string {
-  data, err := ioutil.ReadFile("/proc/" + strconv.Itoa(pid) + "/cmdline")
+  data, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/cmdline", pid))
   if err != nil {
     return ""
   }
@@ -54,7 +55,7 @@ func CmdLine(pid int) string {
 
 // Swap return the swap usage for a process
 func Swap(pid int) int {
-  data, err := ioutil.ReadFile("/proc/" + strconv.Itoa(pid) + "/status")
+  data, err := ioutil.ReadFile(fmt.Sprintf("/proc/%d/status", pid))
   if err != nil {
     return 0
   }

swapus.go

@@ -68,6 +68,6 @@ func main() {
     if proc.Swap == 0 || proc.CmdLine == "" {
       continue
     }
-    fmt.Printf("%d kB [%d] %v\n", proc.Swap, proc.Pid, proc.CmdLine)
+    fmt.Printf("%d kB [%d] %s\n", proc.Swap, proc.Pid, proc.CmdLine)
   }
 }