cheat/internal/sheets/filter.go

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package sheets
import (
"strings"
"github.com/cheat/cheat/internal/sheet"
)
// Filter filters cheatsheets that do not match `tag(s)`
func Filter(
cheatpaths []map[string]sheet.Sheet,
tags []string,
) []map[string]sheet.Sheet {
// buffer a map of filtered cheatsheets
filtered := make([]map[string]sheet.Sheet, 0, len(cheatpaths))
// iterate over each cheatpath
for _, cheatsheets := range cheatpaths {
// create a map of cheatsheets for each cheatpath. The filtering will be
// applied to each cheatpath individually.
pathFiltered := make(map[string]sheet.Sheet)
// iterate over each cheatsheet that exists on each cheatpath
for title, sheet := range cheatsheets {
// assume that the sheet should be kept (ie, should not be filtered)
keep := true
// iterate over each tag. If the sheet does not match *all* tags, filter
// it out.
for _, tag := range tags {
if !sheet.Tagged(strings.TrimSpace(tag)) {
keep = false
}
}
// if the sheet does match all tags, it passes the filter
if keep {
pathFiltered[title] = sheet
}
}
// the sheets on this individual cheatpath have now been filtered. Now,
// store those alongside the sheets on the other cheatpaths that also made
// it passed the filter.
filtered = append(filtered, pathFiltered)
}
// return the filtered cheatsheets on all paths
return filtered
}