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package main
import (
"context"
"fmt"
"log"
"os"
"slices"
"sort"
"sync"
"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()
fmt.Print("\033[s")
showLoadingPrompt(fmt.Sprintf("What the heck is \"%s\"", pkgName))
// try reading from cache
var stat *statistics
if NoCache {
stat = &statistics{PkgName: pkgName}
} else {
stat = NewStatisticsFromCache(pkgName)
if stat == nil {
stat = &statistics{PkgName: pkgName}
}
}
fmlChan := make(chan *FormulaInfo)
caskChan := make(chan *CaskInfo)
rvsChan := make(chan []string)
fetchData(pkgName, fmlChan, caskChan, rvsChan)
var wg sync.WaitGroup
wg.Add(1)
go func(){
defer wg.Done()
var fml *FormulaInfo
var cask *CaskInfo
var rvs []string
remaining := 3
for remaining > 0 {
select {
case v := <-fmlChan:
fml = v
remaining--
case v := <-caskChan:
cask = v
remaining--
case v := <-rvsChan:
rvs = v
remaining--
}
fmt.Print("\033[u\033[J")
stat = NewStatistics(fml, cask, pkgName, rvs)
stat.Print()
}
}()
wg.Wait()
// 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 fetchData(pkgName string,
fmlChan chan *FormulaInfo,
caskChan chan *CaskInfo,
rvsChan chan []string) {
// fetching formula/cask info and uses
// async from brew CLI and HTTP API
// use whoever comes first
go func() {
formula, cask := GetBrewInfo(pkgName)
fmlChan <- formula
caskChan <- cask
}()
go func() {
fmlChan <- GetFormulaFromAPI(pkgName)
}()
go func() {
caskChan <- GetCaskFromAPI(pkgName)
}()
// fetching brew uses
go func() {
rvsChan <- GetBrewUses(pkgName)
}()
}
func printErrorAndExit(msg string) {
hideLoadingPrompt()
color.Red("❌ %s", msg)
os.Exit(1)
}
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