split-command.go

package exe

import "strings"

func (r *runner) SplitCommand(s string) []string {
	runes := []rune(s)
	var values []string

	for len(runes) != 0 {
		// Workaround for bug which triggers if "" is detected,
		// then space is the first character instead of a possible " afterwards.
		runes = []rune(strings.TrimSpace(string(runes)))
		if len(runes) == 0 {
			break
		}

		currentRunes := string(runes)
		_ = currentRunes
		first := string(runes[0])
		_ = first

		// TODO: ' and " can be in the middle of a token, so checking the start of a string is not enough.
		if runes[0] == '"' {
			next := search(runes[1:], "\"")
			if next == -1 {
				panic("no matching \": " + s)
			}

			values = append(values, string(runes[1:next+1]))
			runes = runes[next+2:]
		} else {
			// TODO: If ' before next space, do skip this space and go instead to the next ' to continue from there.

			next := search(runes, " ")
			if next == -1 {
				values = append(values, string(runes))
				break
			}

			nextSpecial := search(runes, "'")

			// Early return if nextSpecial is not so.
			if nextSpecial == -1 || nextSpecial > next {
				values = append(values, string(runes[:next]))
				runes = runes[next+1:]
				continue
			}

			var current []rune

			for next != -1 && nextSpecial != -1 && nextSpecial < next {
				// Skip newlines enclosed by specials '  '.

				// Add to current.
				current = append(current, runes[:nextSpecial]...)
				// Move ahead.
				runes = runes[nextSpecial+1:]

				// Find the closing special character.
				nextSpecial = search(runes, "'")
				if nextSpecial == -1 {
					panic("no matching ': " + s)
				}
				// Add up to the closing parameter to current.
				current = append(current, runes[:nextSpecial]...)
				// Mve ahead.
				runes = runes[nextSpecial+1:]

				nextSpecial = search(runes, "'")
				next = search(runes, " ")
			}

			next = search(runes, " ")
			if next == -1 {
				// Add current to last part.
				values = append(values, string(append(current, runes...)))
				// Move ahead.
				break
			}

			// Add current to closing part.
			values = append(values, string(append(current, runes[:next]...)))
			// Move ahead.
			runes = runes[next+1:]
		}
	}

	out := make([]string, len(values))
	copy(out, values)
	return out
}