README
¶
guesswidth
Overview
guesswidth guesses the column position for fixed-width formats(fwf).
The output of the ps command has no delimiters, making the values difficult to machine-readable.
guesswidth guesses smarter than just space delimiters.
guesswidth is guessed based on the position of characters in the header. So having a header will give you better results.
Install command
There is also a guesswidth command.
go install github.com/noborus/guesswidth/cmd/guesswidth@latest
Guess the width output with no delimiters in the command.
$ ps
PID TTY TIME CMD
302965 pts/3 00:00:12 zsh
733211 pts/3 00:00:00 ps
733212 pts/3 00:00:00 tee
733213 pts/3 00:00:00 guesswidth
Split the output like this:
$ ps | guesswidth
PID| TTY | TIME|CMD
302965| pts/3 | 00:00:08|zsh
539529| pts/3 | 00:00:00|ps
539530| pts/3 | 00:00:00|guesswidth
It can be converted to csv.
$ ps | guesswidth csv
PID,TTY,TIME,CMD
302965,pts/3,00:00:12,zsh
733211,pts/3,00:00:00,ps
733212,pts/3,00:00:00,tee
733213,pts/3,00:00:00,guesswidth
Examples
guesswidth inserts a delimiter (| by default) (Colors are changed here for clarity).
Even if there are spaces in the header or body, they will be separated correctly.
ps
docker ps
docker node
Documentation
¶
Overview ¶
Package guesswidth handles the format as formatted by printf. Spaces exist as delimiters, but spaces are not always delimiters. The width seems to be a fixed length, but it doesn't always fit. guesswidth finds the column separation position from the reference line(header) and multiple lines(body).
Index ¶
Examples ¶
Constants ¶
This section is empty.
Variables ¶
This section is empty.
Functions ¶
func Positions ¶ added in v0.3.2
Positions returns separator positions from multiple lines and header line number. Lines before the header line are ignored.
func ToTable ¶
ToTable parses a slice of lines and returns a table.
Example ¶
package main
import (
"fmt"
"github.com/noborus/guesswidth"
)
func main() {
lines := []string{
" PID TTY TIME CMD",
"1595989 pts/6 00:00:01 zsh",
"1690373 pts/6 00:00:00 ps",
}
table := guesswidth.ToTable(lines, 1, true)
fmt.Println(table)
}
Output: [[PID TTY TIME CMD] [1595989 pts/6 00:00:01 zsh] [1690373 pts/6 00:00:00 ps]]
func ToTableN ¶
ToTableN parses a slice of lines and returns a table, but limits the number of splits.
Example ¶
package main
import (
"fmt"
"strings"
"github.com/noborus/guesswidth"
)
func main() {
lines := []string{
"2022-12-21T09:50:16+0000 WARN A warning that should be ignored is usually at this level and should be actionable.",
"2022-12-21T09:50:17+0000 INFO This is less important than debug log and is often used to provide context in the current task.",
"2022-12-10T05:33:53+0000 DEBUG This is a debug log that shows a log that can be ignored.",
"2022-12-10T05:33:53+0000 INFO This is less important than debug log and is often used to provide context in the current task.",
}
table := guesswidth.ToTableN(lines, 1, 2, true)
for _, columns := range table {
fmt.Println(strings.Join(columns, ","))
}
}
Output: 2022-12-21T09:50:16+0000,WARN,A warning that should be ignored is usually at this level and should be actionable. 2022-12-21T09:50:17+0000,INFO,This is less important than debug log and is often used to provide context in the current task. 2022-12-10T05:33:53+0000,DEBUG,This is a debug log that shows a log that can be ignored. 2022-12-10T05:33:53+0000,INFO,This is less important than debug log and is often used to provide context in the current task.
Types ¶
type GuessWidth ¶
type GuessWidth struct {
// ScanNum is the number to scan to analyze.
ScanNum int
// Header is the base line number. It starts from 0.
Header int
// limitSplit is the maximum number of columns to split.
LimitSplit int
// MinLines is the minimum number of lines to recognize as a separator.
// 1 if only the header, 2 or more if there is a blank in the body.
MinLines int
// TrimSpace is whether to trim the space in the value.
TrimSpace bool
// contains filtered or unexported fields
}
GuessWidth reads records from printf-like output.
func NewReader ¶
func NewReader(r io.Reader) *GuessWidth
NewReader returns a new Reader that reads from r.
func (*GuessWidth) Read ¶
func (g *GuessWidth) Read() ([]string, error)
Read reads one row and returns a slice of columns. Scan is executed first if it is not preRead.
func (*GuessWidth) ReadAll ¶
func (g *GuessWidth) ReadAll() [][]string
ReadAll reads all rows and returns a two-dimensional slice of rows and columns.
Source Files
Directories