## Functions to add text

You can use the `a` command to keep appending lines after the current line until you type a line consisting of just a period (".").
You can use the `c` command to keep typing lines to replace the current line until you type a line consisting of just a period (".").
You can use the `i` command to keep inserting lines before the current line until you type a line consisting of just a period (".").
Sometimes you just want to append, type, or insert a single line.
You can use the `a`, `c`, and `i` functions to append or insert the text that you type after the function name.
The functions add text until you type a line that does not end with a backslash ("\").

    # Append text after the current line.
    # usage: <a <text>
    # End the line of text with a backslash ("\") to add another line.
    function+a {
    db0
    a
    ~0
    .
    s/\\$//f
    while(*) {
    r !IFS=""; read -r line; echo "$line"
    s/\\$//f
    }
    }

    # change (replace)  the text of the current line.
    # usage: <c <text>
    # End the line of text with a backslash ("\") to add another line.
    function+c {
    db0
    c
    ~0
    .
    s/\\$//f
    while(*) {
    r !IFS=""; read -r line; echo "$line"
    s/\\$//f
    }
    }

    # Insert text before the current line.
    # usage: <i <text>
    # End the line of text with a backslash ("\") to add another line.
    function+i {
    db0
    i
    ~0
    .
    s/\\$//f
    while(*) {
    r !IFS=""; read -r line; echo "$line"
    s/\\$//f
    }
    }

## Function to edit the current line with Readline

You can use this simple function to edit the text of the current line with Readline.

    # Edit the current line with Readline.
    # usage: <el
    function+el {
    db0
    H-
    ebvar+
    r !bash -c 'IFS=""; read -er -i '. line; echo $line'
    -X
    if(*) {
    d
    }
    }