Re-wrote from scratch in Golang

- Re-implemented the project in Golang, and deprecated Python entirely
- Implemented several new, long-requested features
- Refactored cheatsheets into a separate repository

cmd/cheat/cmd_view.go

@@ -0,0 +1,72 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/alecthomas/chroma/quick"
+
+	"github.com/cheat/cheat/internal/config"
+	"github.com/cheat/cheat/internal/sheets"
+)
+
+// cmdView displays a cheatsheet for viewing.
+func cmdView(opts map[string]interface{}, conf config.Config) {
+
+	cheatsheet := opts["<cheatsheet>"].(string)
+
+	// load the cheatsheets
+	cheatsheets, err := sheets.Load(conf.Cheatpaths)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, fmt.Sprintf("failed to list cheatsheets: %v", err))
+		os.Exit(1)
+	}
+
+	// filter cheatcheats by tag if --tag was provided
+	if opts["--tag"] != nil {
+		cheatsheets = sheets.Filter(
+			cheatsheets,
+			strings.Split(opts["--tag"].(string), ","),
+		)
+	}
+
+	// consolidate the cheatsheets found on all paths into a single map of
+	// `title` => `sheet` (ie, allow more local cheatsheets to override less
+	// local cheatsheets)
+	consolidated := sheets.Consolidate(cheatsheets)
+
+	// fail early if the requested cheatsheet does not exist
+	sheet, ok := consolidated[cheatsheet]
+	if !ok {
+		fmt.Printf("No cheatsheet found for '%s'.\n", cheatsheet)
+		os.Exit(0)
+	}
+
+	// if colorization is not desired, output un-colorized text and exit
+	if conf.Colorize == false && opts["--colorize"] == false {
+		fmt.Print(sheet.Text)
+		os.Exit(0)
+	}
+
+	// otherwise, colorize the output
+	// if the syntax was not specified, default to bash
+	lex := sheet.Syntax
+	if lex == "" {
+		lex = "bash"
+	}
+
+	// apply syntax highlighting
+	err = quick.Highlight(
+		os.Stdout,
+		sheet.Text,
+		lex,
+		conf.Formatter,
+		conf.Style,
+	)
+
+	// if colorization somehow failed, output non-colorized text
+	if err != nil {
+		fmt.Print(sheet.Text)
+	}
+}