Bash格式化80行用户输入

Question

我想知道是否有可能确保description或srcofhlp超过80行文本，它会换行并转到下一行，并创建相同格式的*。我正在查看fold，但不知道是否可以重新格式化，以便显示带有*的换行符。所以举个例子：

/*
 * Filename: BOB
 * Author: Whatever
 * Description: Hi lets just pretend this is over 80 character
 *              and let this continue like this
 */

-

printf "Enter the author: " ; read -r author
printf "Enter the UserID: " ; read -r usrid
printf "Enter the description: " ; read -r description 
printf "Enter sources of help: " ; read -r srcofhlp

printf "%-16s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%-16s%-8s\n\
%s\n\n\n" '/*' ' * Filename: ' "$filename" ' * Author: ' \
"$author" ' * UserId: ' "$usrid" ' * Description: ' "${description} " ' * Date: ' \
"$today" ' * Sources of Help: ' "$srcofhlp" ' */' > $filename

Answer 1

这里有一个小函数，它可能会有所帮助--或者至少为你指明正确的方向：

#!/bin/bash

author='whatever'
description='Hello lets just pretend this is over 80 character and let this continue like this blah blah blah blah blah blah blah blah fdjsklf fsdf a f dsg a g asg sg g asgd a sdg sggsag   g asdg sa g s gd sag  '

function format_description() {
    local start

    fmt -w 60 <<< "$description" | while read line
    do
        if ! ((start++))
        then
            echo " * Description: $line"
        else
            echo " *              $line"
        fi
    done
}

format_description "$description"

这将输出以下内容：

 * Description: Hello lets just pretend this is over 80 character and let
 *              this continue like this blah blah blah blah blah blah blah
 *              blah fdjsklf fsdf a f dsg a g asg sg g asgd a sdg sggsag
 *              g asdg sa g s gd sag

Answer 2

这里有一种方法-它不理解C风格注释的完整语法(例如，不是开始/*和结束*/)，但它可能有用：

$ echo " * this is a somewhat longish string with a prefix" | fmt -10 -p " * "
 * this
 * is a
 * somewhat
 * longish
 * string
 * with a
 * prefix
$