114 lines
2.8 KiB
V
114 lines
2.8 KiB
V
module cli
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import term
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import strings
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const (
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c_base_indent = 2
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c_abbrev_indent = 5
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c_description_indent = 20
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)
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fn help_flag() Flag {
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return Flag{
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flag: .bool,
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name: 'help',
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abbrev: 'h',
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description: 'Prints help information',
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}
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}
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fn help_cmd() Command {
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return Command{
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name: 'help',
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description: 'Prints help information',
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execute: help_func,
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parent: 0
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}
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}
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fn help_func(help_cmd Command) {
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cmd := help_cmd.parent
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full_name := cmd.full_name()
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mut help := ''
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help += 'Usage: ${full_name}'
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if cmd.flags.len > 0 { help += ' [FLAGS]'}
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if cmd.commands.len > 0 { help += ' [COMMANDS]'}
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help += '\n\n'
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if cmd.description != '' {
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help += '${cmd.description}\n\n'
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}
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if cmd.flags.len > 0 {
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help += 'Flags:\n'
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for flag in cmd.flags {
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mut flag_name := ''
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if flag.abbrev != '' {
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abbrev_indent := ' '.repeat(max(c_abbrev_indent-(flag.abbrev.len+1), 1))
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flag_name = '-${flag.abbrev}${abbrev_indent}--${flag.name}'
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} else {
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abbrev_indent := ' '.repeat(max(c_abbrev_indent-(flag.abbrev.len), 1))
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flag_name = '${abbrev_indent}--${flag.name}'
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}
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mut required := ''
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if flag.required {
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required = ' (required)'
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}
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base_indent := ' '.repeat(c_base_indent)
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description_indent := ' '.repeat(max(c_description_indent-flag_name.len, 1))
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help += '${base_indent}${flag_name}${description_indent}' +
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pretty_description(flag.description + required) + '\n'
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}
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help += '\n'
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}
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if cmd.commands.len > 0 {
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help += 'Commands:\n'
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for command in cmd.commands {
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base_indent := ' '.repeat(c_base_indent)
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description_indent := ' '.repeat(max(c_description_indent-command.name.len, 1))
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help += '${base_indent}${command.name}${description_indent}' +
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pretty_description(command.description) + '\n'
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}
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help += '\n'
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}
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print(help)
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}
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// pretty_description resizes description text depending on terminal width.
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// Essentially, smart wrap-around
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fn pretty_description(s string) string {
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width, _ := term.get_terminal_size()
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// Don't prettify if the terminal is that small, it won't be pretty anyway.
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if s.len + c_description_indent < width || c_description_indent > width {
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return s
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}
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indent := ' '.repeat(c_description_indent + 1)
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chars_per_line := width - c_description_indent
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// Give us enough room, better a little bigger than smaller
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mut acc := strings.new_builder(((s.len / chars_per_line) + 1) * (width + 1))
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mut i := chars_per_line - 2
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mut j := 0
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for ; i < s.len ; i += chars_per_line - 2 {
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for s.str[i] != ` ` { i-- }
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// indent was already done the first iteration
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if j != 0 { acc.write(indent) }
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acc.writeln(s[j..i])
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j = i
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}
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// We need this even though it should never happen
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if j != 0 {
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acc.write(indent)
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}
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acc.write(s[j..])
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return acc.str()
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}
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fn max(a, b int) int {
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return if a > b {a} else {b}
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}
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