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package main
import (
"context"
"fmt"
"log"
"os"
"slices"
"sort"
"github.com/fatih/color"
"github.com/urfave/cli/v3"
)
// flags
var NoCache, DoClearCache bool
var ListAscend, ListDescend, ListNoDep bool
func main() {
EnsureBrewAvailable()
// declare CLI app
cmd := &cli.Command{
Name: "wthis",
Usage: "Fetch information of a Homebrew formulae or cask, like how it got installed, reverse dependencies, etc.",
Flags: []cli.Flag{
&cli.BoolFlag{
Name: "no-cache",
Aliases: []string{"nc"},
Usage: "Disable caching",
Value: false,
Destination: &NoCache,
},
},
Action: func(ctx context.Context, cmd *cli.Command) error {
if DoClearCache {
ClearCache()
fmt.Println("Cache cleared.")
os.Exit(0)
}
// handle arguments
if cmd.Args().Len() == 0 {
printErrorAndExit("Please provide a formulae/cask name.")
}
pkgName := cmd.Args().First()
// search and print
showLoadingPrompt(fmt.Sprintf("What the heck is \"%s\"", pkgName))
stat := fetchToCreateStatistics(pkgName)
hideLoadingPrompt()
stat.Print()
// cache
if !NoCache {
stat.Cache()
}
return nil
},
Commands: []*cli.Command{
{
Name: "list",
Aliases: []string{"l", "ls"},
Usage: "Better brew list.",
Flags: []cli.Flag{
&cli.BoolFlag{
Name: "ascending",
Aliases: []string{"a"},
Usage: "Sort list ascendingly, based on dependency count.",
Value: false,
Destination: &ListAscend,
},
&cli.BoolFlag{
Name: "descending",
Aliases: []string{"d"},
Usage: "Sort list descendingly, based on dependency count.",
Value: false,
Destination: &ListDescend,
},
&cli.BoolFlag{
Name: "no-dependency",
Aliases: []string{"n", "nd"},
Usage: "Only show packages installed on request, with no dependency list.",
Value: false,
Destination: &ListNoDep,
},
},
Action: func(ctx context.Context, cmd *cli.Command) error {
depmap := GetBrewDeps()
list := GetBrewList()
// filter and get essential items
var keys = []string{}
for k := range depmap {
if !slices.Contains(list, k) {
delete(depmap, k)
} else {
keys = append(keys, k)
}
}
// sort based on dependency count
if ListAscend {
sort.Slice(keys, func(i, j int) bool {
return len(depmap[keys[i]]) > len(depmap[keys[j]])
})
} else if ListDescend {
sort.Slice(keys, func(i, j int) bool {
return len(depmap[keys[i]]) < len(depmap[keys[j]])
})
} else {
sort.Strings(keys)
}
//
for _, pkg := range keys {
deps := depmap[pkg]
count := len(deps)
color.New(color.FgBlue).Printf("%s", pkg)
if count > 1 {
fmt.Printf(" (%d dependencies)\n", count)
} else {
fmt.Printf(" (%d dependency)\n", count)
}
if ListNoDep { continue }
for _, dep := range deps {
fmt.Printf(" ► %s\n", dep)
}
}
return nil
},
},
{
Name: "clean",
Aliases: []string{"c", "cache"},
Usage: "Delete all cache files.",
Action: func(ctx context.Context, cmd *cli.Command) error {
// TODO error handling here
ClearCache()
fmt.Println("Cache cleared.")
return nil
},
},
},
}
// run command and handle error
if err := cmd.Run(context.Background(), os.Args); err != nil {
log.Fatal(err)
}
}
func fetchToCreateStatistics(pkgName string) *statistics {
// try reading from cache
var stat *statistics
if !NoCache {
stat = NewStatisticsFromCache(pkgName)
}
// if cache not hit or explicitly requested no cache
if NoCache || stat == nil {
fmlChan := make(chan *FormulaInfo)
caskChan := make(chan *CaskInfo)
rvsChan := make(chan []string)
// start 2 goroutines, fetching formula/cask info and uses
go func() {
formula, cask := GetBrewInfo(pkgName)
fmlChan <- formula
caskChan <- cask
}()
go func() {
rvsChan <- GetBrewUses(pkgName)
}()
// create fine-grained data out of raw
stat = NewStatistics(<-fmlChan, <-caskChan, pkgName, <-rvsChan)
}
return stat
}
func printErrorAndExit(msg string) {
hideLoadingPrompt()
color.Red("❌ %s", msg)
os.Exit(1)
}
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