mirror of
https://github.com/go-sylixos/elvish.git
synced 2024-12-05 03:17:50 +08:00
109 lines
2.0 KiB
Go
109 lines
2.0 KiB
Go
package eval
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import (
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"runtime"
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"github.com/elves/elvish/pkg/logutil"
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"github.com/elves/elvish/pkg/parse"
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)
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func init() {
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addBuiltinFns(map[string]interface{}{
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"src": src,
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"-gc": _gc,
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"-stack": _stack,
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"-log": _log,
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})
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}
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//elvdoc:fn src
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//
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// ```elvish
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// src
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// ```
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//
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// Output a map-like value describing the current source being evaluated. The value
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// contains the following fields:
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//
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// - `name`, a unique name of the current source. If the source originates from a
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// file, it is the full path of the file.
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//
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// - `code`, the full body of the current source.
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//
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// - `is-file`, whether the source originates from a file.
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//
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// Examples:
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//
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// ```elvish-transcript
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// ~> put (src)[name code is-file]
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// ▶ '[tty]'
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// ▶ 'put (src)[name code is-file]'
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// ▶ $false
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// ~> echo 'put (src)[name code is-file]' > show-src.elv
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// ~> elvish show-src.elv
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// ▶ /home/elf/show-src.elv
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// ▶ "put (src)[name code is-file]\n"
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// ▶ $true
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//
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// Note: this builtin always returns information of the source of the function
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// calling `src`. Consider the following example:
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//
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// ```elvish-transcript
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// ~> echo 'fn show { put (src)[name] }' > ~/.elvish/lib/src-fsutil.elv
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// ~> use src-util
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// ~> src-util:show
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// ▶ /home/elf/.elvish/lib/src-fsutil.elv
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// ```
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func src(fm *Frame) parse.Source {
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return fm.srcMeta
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}
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//elvdoc:fn -gc
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//
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// ```elvish
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// -gc
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// ```
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//
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// Force the Go garbage collector to run.
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//
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// This is only useful for debug purposes.
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func _gc() {
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runtime.GC()
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}
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//elvdoc:fn -stack
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//
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// ```elvish
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// -stack
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// ```
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//
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// Print a stack trace.
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//
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// This is only useful for debug purposes.
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func _stack(fm *Frame) {
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out := fm.OutputFile()
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// TODO(xiaq): Dup with main.go.
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buf := make([]byte, 1024)
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for runtime.Stack(buf, true) == cap(buf) {
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buf = make([]byte, cap(buf)*2)
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}
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out.Write(buf)
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}
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//elvdoc:fn -log
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//
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// ```elvish
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// -log $filename
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// ```
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//
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// Direct internal debug logs to the named file.
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//
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// This is only useful for debug purposes.
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func _log(fname string) error {
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return logutil.SetOutputFile(fname)
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}
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