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60 lines
1.6 KiB
Go
60 lines
1.6 KiB
Go
// Package errutil provides an exception-like mechanism and the ContextualError
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// type.
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package errutil
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import (
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"bytes"
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"fmt"
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"strings"
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"github.com/elves/elvish/strutil"
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)
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// ContextualError is an error associated with a particular point in a source
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// text.
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type ContextualError struct {
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srcname string
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title string
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pos int
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line string
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lineno int
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colno int
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msg string
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}
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// NewContextualError creates a new ContextualError.
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func NewContextualError(srcname, title, text string, pos int, format string, args ...interface{}) *ContextualError {
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lineno, colno, line := strutil.FindContext(text, pos)
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return &ContextualError{srcname, title, pos, line, lineno, colno, fmt.Sprintf(format, args...)}
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}
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func (e *ContextualError) Pos() int {
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return e.pos
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}
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// Error implements the error interface. It returns a compact representation of
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// the error.
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func (e *ContextualError) Error() string {
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return fmt.Sprintf("%s:%d:%d %s:%s", e.srcname, e.lineno, e.colno, e.title, e.msg)
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}
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// Pprint pretty-prints a ContextualError with the error position, the affected
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// line an arrow pointing to the point of error and the error message, with
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// colors.
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func (e *ContextualError) Pprint() string {
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buf := new(bytes.Buffer)
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// Position info
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fmt.Fprintf(buf, "\033[1m%s:%d:%d: ", e.srcname, e.lineno+1, e.colno+1)
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// "error:"
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fmt.Fprintf(buf, "\033[31m%s: ", e.title)
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// Message
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fmt.Fprintf(buf, "\033[m\033[1m%s\033[m\n", e.msg)
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// Context: line
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// TODO Handle long lines
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fmt.Fprintf(buf, "%s\n", e.line)
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// Context: arrow
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// TODO Handle multi-width characters
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fmt.Fprintf(buf, "%s\033[32;1m^\033[m\n", strings.Repeat(" ", e.colno))
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return buf.String()
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}
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