{"id":31917911,"url":"https://github.com/hiscaler/csv-go","last_synced_at":"2025-10-13T20:51:45.409Z","repository":{"id":37301786,"uuid":"503196341","full_name":"hiscaler/csv-go","owner":"hiscaler","description":"CSV helper for 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For Golang\n==============\n\n![CI status](https://github.com/hiscaler/csv-go/actions/workflows/ci.yml/badge.svg)\n\ncsv-go is csv/tsv/psv file helper, current supported csv, tsv, psv format.\n\nUse it to help you process data quickly.\n\n## Install\n\n```go\ngo get github.com/hiscaler/csv-go\n```\n\n## Notices\n\n**Row and Column start index from 1, not 0**\n\n## Usage\n\n### Open file\n\n```go\ncsv := NewCSV()\nerr := csv.Open(\"./testdata/test.csv\")\nif err != nil {\n    panic(err)\n}\ndefer csv.Close()\n```\n\n### Reset\n\nYou can use it reset csv file, and re-read the file. \n\n```go\ncsv.Reset()\n```\n\nafter reset, file reader config will remain the same.\n\n### Reads all rows\n\n```go\nfor {\n    row, isEOF, err := csv.Row()\n    if isEOF {\n        break\n    }\n    if err != nil {\n        log.Fatal(err)\n    }\n    // Read first column data with current row, and add \"A\" prefix return value\n    column := row.Column(1).\n        TrimSpace().\n        Do(func(s string) string {\n            return s + \"A\"\n        })    \n\n    column = row.Column(1).\n        TrimSpace().\n        Do(func(s string) string {\n            // change return value\n            v := \"\"\n            switch s {\n            case \"one\":\n                v = \"1\"\n            case \"two\":\n                v = \"2\"\n            case \"three\":\n                v = \"3\"\n            default:\n                v = \"\"\n            }\n            return v\n        })\n    if row.Number != 1 {\n        i, _ := column.ToInt()\n        fmt.Println(i)\n    }\n}\n```\n\n### Reads a row\n\n```go\nrow, isEOF, err := csv.Row()\n```\n\n### Change row data\n\nIf you want to fix column value in current row, you can do it：\n\n```go\nrow.Map(func (s string) string {\n    return \"PREFIX_\" + s\n}, 1)\n```\n\nThe above code change first column value, will return \"PREFIX_\" and original column value concatenated string.\n\nIf you want change all columns value, don't pass `columnIndex` parameter value. Then all columns value will add \"PREFIX_\" prefix string.\n\n### Change a column value\n\n```go\ncolumn := row.Column(1).TrimSpace()\n```\n\nWill remove the spaces on both sides\n\nor you can use Do() method perform custom processing, example:\n\n```go\ncolumn := row.Column(1).Do(func(s string) string {\n    if s == \"a\" {\n        return \"Number One\"\n    } else if s == \"\" {\n        return \"SOS\"\n    }\n    return s\n})\n```\n\n### Reads a column in the current row\n\n```go\n// Read first column in current row\ncolumn := row.Column(1)\ncolumn.TrimSpace() // Clear spaces\ncolumn.Do(func(s string) string {\n\t// process value\n\treturn s\n}) // Use Do method process value\ncolumn.String() // get string value\n\n// if you want to get correct value, you will check err and continue\nv, err := column.ToInt() // get int value\nv, err := column.ToInt(\"100\") // get int value, and return 100 if value is empty\nv, err := column.ToFloat64() // get float value\nv, err := column.ToFloat64(\"100.00\") // get float value, and return 100.00 if value is empty\nv, err := column.ToBool() // get boolean value\nv, err := column.ToBool(\"false\") // get boolean value, and return false if value is empty\nv, err := column.ToTime(\"2006-01-02\", time.Local) // get time value\nv, err := column.ToTime(\"2006-01-02\", time.Local, \"2022-01-01\") // get time value, and return 2022-01-01 if value is empty\n```\n\n**Valid column value conversion methods**\n\n- String()\n- ToBytes()\n- ToInt()\n- ToInt8()\n- ToInt16()\n- ToInt32()\n- ToInt64()\n- ToFloat32()\n- ToFloat64()\n- ToBool()\n- ToTime()\n\n### Save file\n\nSaveAs() use to save a file.\n\nThis method help you create saved directory if not exists, and check you file extension save to csv/tsv/psv format. if save have any error will return it.\n\n```go\nrecords := make([][]string, 0)\nfor {\n    row, isEOF, err := csvInstance.Row()\n    if isEOF {\n        break\n    }\n    if err != nil {\n        log.Fatal(err)\n    }\n    // Do what you want to do \n    row.Map(func(s string) string {\n        if row.Number != 1 {\n            // Ignore header\n            s = `1, \"change\"` + s\n        }\n        return s\n    })\n    records = append(records, row.Columns)\n}\nerr := csvInstance.SaveAs(\"./a.csv\", records)\n```","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhiscaler%2Fcsv-go","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fhiscaler%2Fcsv-go","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fhiscaler%2Fcsv-go/lists"}