1package transformers
2
3import (
4	"fmt"
5	"os"
6
7	"miller/src/cliutil"
8	"miller/src/lib"
9	"miller/src/transforming"
10	"miller/src/types"
11)
12
13// ----------------------------------------------------------------
14const verbNameSec2GMTDate = "sec2gmtdate"
15
16var Sec2GMTDateSetup = transforming.TransformerSetup{
17	Verb:         verbNameSec2GMTDate,
18	UsageFunc:    transformerSec2GMTDateUsage,
19	ParseCLIFunc: transformerSec2GMTDateParseCLI,
20	IgnoresInput: false,
21}
22
23func transformerSec2GMTDateUsage(
24	o *os.File,
25	doExit bool,
26	exitCode int,
27) {
28	fmt.Fprintf(o, "Usage: ../c/mlr sec2gmtdate {comma-separated list of field names}\n")
29	fmt.Fprintf(o, "Replaces a numeric field representing seconds since the epoch with the\n")
30	fmt.Fprintf(o, "corresponding GMT year-month-day timestamp; leaves non-numbers as-is.\n")
31	fmt.Fprintf(o, "This is nothing more than a keystroke-saver for the sec2gmtdate function:\n")
32	fmt.Fprintf(o, "  ../c/mlr sec2gmtdate time1,time2\n")
33	fmt.Fprintf(o, "is the same as\n")
34	fmt.Fprintf(o, "  ../c/mlr put '$time1=sec2gmtdate($time1);$time2=sec2gmtdate($time2)'\n")
35
36	if doExit {
37		os.Exit(exitCode)
38	}
39}
40
41func transformerSec2GMTDateParseCLI(
42	pargi *int,
43	argc int,
44	args []string,
45	_ *cliutil.TReaderOptions,
46	__ *cliutil.TWriterOptions,
47) transforming.IRecordTransformer {
48
49	// Skip the verb name from the current spot in the mlr command line
50	argi := *pargi
51	argi++
52
53	for argi < argc /* variable increment: 1 or 2 depending on flag */ {
54		opt := args[argi]
55		if opt[0] != '-' {
56			break // No more flag options to process
57		}
58		argi++
59
60		if opt == "-h" || opt == "--help" {
61			transformerSec2GMTDateUsage(os.Stdout, true, 0)
62
63		} else {
64			transformerSec2GMTDateUsage(os.Stderr, true, 1)
65		}
66	}
67
68	if argi >= argc {
69		transformerSec2GMTDateUsage(os.Stderr, true, 1)
70	}
71	fieldNames := args[argi]
72	argi++
73
74	transformer, _ := NewTransformerSec2GMTDate(
75		fieldNames,
76	)
77
78	*pargi = argi
79	return transformer
80}
81
82// ----------------------------------------------------------------
83type TransformerSec2GMTDate struct {
84	fieldNameList []string
85}
86
87func NewTransformerSec2GMTDate(
88	fieldNames string,
89) (*TransformerSec2GMTDate, error) {
90	this := &TransformerSec2GMTDate{
91		fieldNameList: lib.SplitString(fieldNames, ","),
92	}
93	return this, nil
94}
95
96// ----------------------------------------------------------------
97func (this *TransformerSec2GMTDate) Transform(
98	inrecAndContext *types.RecordAndContext,
99	outputChannel chan<- *types.RecordAndContext,
100) {
101	if !inrecAndContext.EndOfStream {
102		inrec := inrecAndContext.Record
103		for _, fieldName := range this.fieldNameList {
104			value := inrec.Get(fieldName)
105			if value != nil {
106				inrec.PutReference(fieldName, types.MlrvalSec2GMTDate(value))
107			}
108		}
109		outputChannel <- inrecAndContext
110
111	} else { // End of record stream
112		outputChannel <- inrecAndContext // end-of-stream marker
113	}
114}
115