feat(cli): print how recent a formulae is used

3 files changed, 46 insertions, 2 deletions

diff --git a/go.mod b/go.mod
index e83fa49..e4ccc5b 100644
--- a/go.mod
+++ b/go.mod
@@ -5,6 +5,7 @@ go 1.25.4
 require (
 	github.com/adrg/xdg v0.5.3 // direct
 	github.com/fatih/color v1.18.0 // direct
+	github.com/hako/durafmt v0.0.0-20180520121703-7b7ae1e72ead // direct
 	github.com/urfave/cli/v3 v3.6.0 // direct
 )
 
diff --git a/go.sum b/go.sum
index 17a574c..0b9ea11 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/fatih/color v1.18.0 h1:S8gINlzdQ840/4pfAwic/ZE0djQEH3wM94VfqLTZcOM=
 github.com/fatih/color v1.18.0/go.mod h1:4FelSpRwEGDpQ12mAdzqdOukCy4u8WUtOY6lkT/6HfU=
+github.com/hako/durafmt v0.0.0-20180520121703-7b7ae1e72ead h1:Y9WOGZY2nw5ksbEf5AIpk+vK52Tdg/VN/rHFRfEeeGQ=
+github.com/hako/durafmt v0.0.0-20180520121703-7b7ae1e72ead/go.mod h1:5Scbynm8dF1XAPwIwkGPqzkM/shndPm79Jd1003hTjE=
 github.com/mattn/go-colorable v0.1.13 h1:fFA4WZxdEF4tXPZVKMLwD8oUnCTTo08duU7wxecdEvA=
 github.com/mattn/go-colorable v0.1.13/go.mod h1:7S9/ev0klgBDR4GtXTXX8a3vIGJpMovkB8vQcUbaXHg=
 github.com/mattn/go-isatty v0.0.16/go.mod h1:kYGgaQfpe5nmfYZH+SKPsOc2e4SrIfOl2e/yFXSvRLM=
diff --git a/print.go b/print.go
index ad85957..f268ec5 100644
--- a/print.go
+++ b/print.go
@@ -4,6 +4,11 @@ import (
 	"fmt"
 	"github.com/fatih/color"
 	"strings"
+	"os"
+	"path/filepath"
+	"syscall"
+	"time"
+	"github.com/hako/durafmt"
 )
 
 func PrintInfo(formula *FormulaInfo, cask *CaskInfo, pkgName string) {
@@ -14,6 +19,7 @@ func PrintInfo(formula *FormulaInfo, cask *CaskInfo, pkgName string) {
 
 	printHeader(formula, cask)
 	printInstallDesc(formula, cask)
+	printRecentActivity(formula, cask, pkgName)
 	printVersionInfo(formula, cask)
 	printMetadata(formula, cask)
 
@@ -53,9 +59,9 @@ func printInstallDesc(formula *FormulaInfo, cask *CaskInfo) {
 	if len(formula.Installed) == 0 {
 		return
 	} else if formula.Installed[0].InstalledOnRequest {
-		color.Blue("You installed this package by running `brew install`.\n")
+		color.Blue("► You installed this package by running `brew install`.\n")
 	} else if formula.Installed[0].InstalledAsDependency {
-		color.Blue("This package was installed automatically as a dependency.\n")
+		color.Blue("► This package was installed automatically as a dependency.\n")
 		// list reverse dependencies
 		dependencies, err := GetReverseDependencies(formula.Name)
 		if err != nil {
@@ -67,6 +73,41 @@ func printInstallDesc(formula *FormulaInfo, cask *CaskInfo) {
 	fmt.Println()
 }
 
+// answers questions like "have I used this recently?"
+func printRecentActivity(formula *FormulaInfo, cask *CaskInfo, pkgName string) {
+	// skip if not installed
+	if (formula != nil && len(formula.Installed) == 0) ||
+		(cask != nil && cask.Installed == "") {
+		return
+	}
+
+	// get last access time (atime)
+	binPath := filepath.Join("/opt/homebrew/bin", pkgName)
+	info, err := os.Stat(binPath)
+	if err != nil {
+		return	// skip if no binary is found
+	}
+	atime := info.Sys().(*syscall.Stat_t).Atimespec
+
+	// print usage info
+	var format string
+	var humanReadableDuration string
+
+	timestamp := time.Unix(atime.Unix())
+	humanReadableDuration = durafmt.ParseShort(time.Since(timestamp)).String()
+	format = func() string {
+		if atime.Nano() == 0 {
+			return "► You never used this."
+		} else if time.Since(timestamp) < 24*7*time.Hour {
+			return "► You used this in %s."
+		} else {
+			return "► You haven't used this for %s."
+		}
+	}()
+
+	color.Blue(format, humanReadableDuration)
+}
+
 // prints badges like [Outdated] [Up to date] ...
 // used by printMetadata
 func printVersionInfo(formula *FormulaInfo, cask *CaskInfo) {