cheat/internal/sheets/load.go

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package sheets
import (
"fmt"
"os"
"path/filepath"
"strings"
cp "github.com/cheat/cheat/internal/cheatpath"
"github.com/cheat/cheat/internal/sheet"
)
// Load produces a map of cheatsheet titles to filesystem paths
func Load(cheatpaths []cp.Cheatpath) ([]map[string]sheet.Sheet, error) {
// create a slice of maps of sheets. This structure will store all sheets
// that are associated with each cheatpath.
sheets := make([]map[string]sheet.Sheet, len(cheatpaths))
// iterate over each cheatpath
for _, cheatpath := range cheatpaths {
// vivify the map of cheatsheets on this specific cheatpath
pathsheets := make(map[string]sheet.Sheet)
// recursively iterate over the cheatpath, and load each cheatsheet
// encountered along the way
err := filepath.Walk(
cheatpath.Path, func(
path string,
info os.FileInfo,
err error) error {
// fail if an error occurred while walking the directory
if err != nil {
return fmt.Errorf("error walking path: %v", err)
}
// don't register directories as cheatsheets
if info.IsDir() {
return nil
}
// calculate the cheatsheet's "title" (the phrase with which it may be
// accessed. Eg: `cheat tar` - `tar` is the title)
title := strings.TrimPrefix(
strings.TrimPrefix(path, cheatpath.Path),
"/",
)
// ignore hidden files and directories. Otherwise, we'll likely load
// .git/* and .DS_Store.
//
// NB: this is still somewhat brittle in that it will miss files
// contained within hidden directories in the middle of a path, though
// that should not realistically occur.
if strings.HasPrefix(title, ".") || strings.HasPrefix(info.Name(), ".") {
return nil
}
// parse the cheatsheet file into a `sheet` struct
s, err := sheet.New(title, path, cheatpath.Tags, cheatpath.ReadOnly)
if err != nil {
return fmt.Errorf("could not create sheet: %v", err)
}
// register the cheatsheet on its cheatpath, keyed by its title
pathsheets[title] = s
return nil
})
if err != nil {
return sheets, fmt.Errorf("failed to load cheatsheets: %v", err)
}
// store the sheets on this cheatpath alongside the other cheatsheets on
// other cheatpaths
sheets = append(sheets, pathsheets)
}
// return the cheatsheets, grouped by cheatpath
return sheets, nil
}