New version

.gitignore

@@ -1,4 +1,5 @@
 /bin
 # /.vscode
 *.csv
+*.md
 !example.csv

.vscode/launch.json

@@ -2,19 +2,17 @@
     // Use IntelliSense to learn about possible attributes.
     // Hover to view descriptions of existing attributes.
     // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
-    {
-        "version": "0.2.0",
-        "configurations": [
-            {
-                "name": "Launch Package",
-                "type": "go",
-                "request": "launch",
-                "mode": "auto",
-                "program": "${fileBasename}",
-                "args": [
-                    "example.csv",
-                ]
-            }
-        ]
-    }
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "name": "Debug csv2md",
+            "type": "go",
+            "request": "launch",
+            "mode": "auto",
+            "program": "main.go"
+            // "args": [
+            //     "example.csv",
+            // ]
+        }
+    ]
 }

README.md

@@ -4,20 +4,35 @@ Stupidly simple tool to convert csv-file to [markdown](https://spec-md.com/) tab
 
 Outputs result in stdout.
 
-Building:
+## Usage
 
 ```shell
-make help
-```
-
-Usage:
+csv2md (-h|-help|--help|help)    # to get this help
+csv2md example.csv               # convert data from file and write result in stdout
+csv2md < example.csv             # convert data from stdin and write result in stdout
+cat example.csv | csv2md         # convert data from stdin and write result in stdout
+csv2md example.csv > example.md  # convert data from file and write result in new file
+csv2md example.csv | less        # convert data from file and write result in stdout using pager
+csv2md                           # paste or type data to stdin by hands
+                                 # press Ctrl+D to view result in stdout
+csv2md > example.md              # paste or type data to stdin by hands
+                                 # press Ctrl+D to write result in new file
 
-```shell
-csv2md example.csv > example.md # makes new file
-csv2md example.csv | less       # view result using *pager*
 ...anything is possible with redirection and piping
 ```
 
-> **IMPORTANT:** input must be valid csv and whitespaces are allowed only between double-quotes.
+> **IMPORTANT:**
+> * input must be valid csv
+> * whitespaces allowed only between double-quotes
 
 Examples can be found here: https://people.sc.fsu.edu/~jburkardt/data/csv/csv.html
+
+## Compilation
+
+1) [Install go](https://go.dev/learn/).
+2) Download this repo via zip or `git clone`.
+3) Run `make help` to get help or `go run . <csv_path>` to build and run temporary binary.
+
+## License
+
+[MIT](LICENSE)

example.csv

@@ -1,14 +1,50 @@
-"Month","1958","1959","1960"
-"JAN",340,360,417
-"FEB",318,342,391
-"MAR",362,406,419
-"APR",348,396,461
-"MAY",363,420,472
-"JUN",435,472,535
-"JUL",491,548,622
-"AUG",505,559,606
-"SEP",404,463,508
-"OCT",359,407,461
-"NOV",310,362,390
-"DEC",337,405,432
-
+"Name","Team","Position","Height(inches)","Weight(lbs)","Age"
+"Adam Donachie","BAL","Catcher",74,180,22.99
+"Paul Bako","BAL","Catcher",74,215,34.69
+"Ramon Hernandez","BAL","Catcher",72,210,30.78
+"Kevin Millar","BAL","First Baseman",72,210,35.43
+"Chris Gomez","BAL","First Baseman",73,188,35.71
+"Brian Roberts","BAL","Second Baseman",69,176,29.39
+"Miguel Tejada","BAL","Shortstop",69,209,30.77
+"Melvin Mora","BAL","Third Baseman",71,200,35.07
+"Aubrey Huff","BAL","Third Baseman",76,231,30.19
+"Adam Stern","BAL","Outfielder",71,180,27.05
+"Jeff Fiorentino","BAL","Outfielder",73,188,23.88
+"Freddie Bynum","BAL","Outfielder",73,180,26.96
+"Nick Markakis","BAL","Outfielder",74,185,23.29
+"Brandon Fahey","BAL","Outfielder",74,160,26.11
+"Corey Patterson","BAL","Outfielder",69,180,27.55
+"Jay Payton","BAL","Outfielder",70,185,34.27
+"Jay Gibbons","BAL","Designated Hitter",72,197,30
+"Erik Bedard","BAL","Starting Pitcher",73,189,27.99
+"Hayden Penn","BAL","Starting Pitcher",75,185,22.38
+"Adam Loewen","BAL","Starting Pitcher",78,219,22.89
+"Daniel Cabrera","BAL","Starting Pitcher",79,230,25.76
+"Steve Trachsel","BAL","Starting Pitcher",76,205,36.33
+"Jaret Wright","BAL","Starting Pitcher",74,230,31.17
+"Kris Benson","BAL","Starting Pitcher",76,195,32.31
+"Scott Williamson","BAL","Relief Pitcher",72,180,31.03
+"John Parrish","BAL","Relief Pitcher",71,192,29.26
+"Danys Baez","BAL","Relief Pitcher",75,225,29.47
+"Chad Bradford","BAL","Relief Pitcher",77,203,32.46
+"Jamie Walker","BAL","Relief Pitcher",74,195,35.67
+"Brian Burres","BAL","Relief Pitcher",73,182,25.89
+"Kurt Birkins","BAL","Relief Pitcher",74,188,26.55
+"James Hoey","BAL","Relief Pitcher",78,200,24.17
+"Sendy Rleal","BAL","Relief Pitcher",73,180,26.69
+"Chris Ray","BAL","Relief Pitcher",75,200,25.13
+"Jeremy Guthrie","BAL","Relief Pitcher",73,200,27.9
+"A.J. Pierzynski","CWS","Catcher",75,245,30.17
+"Toby Hall","CWS","Catcher",75,240,31.36
+"Paul Konerko","CWS","First Baseman",74,215,30.99
+"Tadahito Iguchi","CWS","Second Baseman",69,185,32.24
+"Juan Uribe","CWS","Shortstop",71,175,27.61
+"Alex Cintron","CWS","Shortstop",74,199,28.2
+"Joe Crede","CWS","Third Baseman",73,200,28.85
+"Josh Fields","CWS","Third Baseman",73,215,24.21
+"Ryan Sweeney","CWS","Outfielder",76,200,22.02
+"Brian N. Anderson","CWS","Outfielder",74,205,24.97
+"Luis Terrero","CWS","Outfielder",74,206,26.78
+"Pablo Ozuna","CWS","Outfielder",70,186,32.51
+"Scott Podsednik","CWS","Outfielder",72,188,30.95
+"Jermaine Dye","CWS","Outfielder",77,220,33.09

main.go

@@ -2,40 +2,71 @@ package main
 
 import (
 	"encoding/csv"
+	"errors"
+	"flag"
 	"fmt"
 	"log"
 	"os"
 	"path/filepath"
 	"strings"
 )
 
-const VERSION = "1.0.0"
+const VERSION = "1.1.0"
 
 func main() {
-	if len(os.Args) < 2 {
-		usage()
-		os.Exit(1)
-	}
+	log.SetFlags(0)
+	switch len(os.Args) {
+		case 1: // first we read data from stdin and then convert it
+			data, err := readRawCsv()
+			if err != nil {
+				log.Fatal(err)
+			}
+			print(data)
 
-	src, err := ExpandPath(os.Args[1])
-	if err != nil {
-		panic(err)
-	}
-	if _, err := os.Stat(src); err != nil {
-		panic(err)
+		case 2: // but if 2nd arg is present
+			// probably user wants to get help
+			help1 := flag.Bool("h", false, "Get help")
+			help2 := flag.Bool("help", false, "Get help")
+			flag.Parse()
+			if os.Args[1] == "help" || *help1 || *help2 {
+				usage(os.Stdout)
+				os.Exit(0)
+			}
+
+			// ...or to convert data from file
+			src, err := ExpandPath(os.Args[1])
+			if err != nil {
+				log.Fatal(err)
+			}
+			if _, err := os.Stat(src); err != nil {
+				log.Fatal(err)
+			}
+
+			data, err := readCsvFile(src)
+			if err != nil {
+				log.Fatal(err)
+			}
+			print(data)
+
+		// otherwise let's show usage help and exit (probably inaccessible code, but anyway)
+		default:
+			usage(os.Stdout)
+			os.Exit(0)
 	}
+}
 
-	result := convert(readCsv(src))
+// print write converted data to stdout
+func print(data [][]string) {
+	if len(data) == 0 {
+		usage(os.Stderr)
+	}
+	result := convert(data)
 	for _, row := range result {
 		fmt.Println(row)
 	}
 }
 
-func usage() {
-	fmt.Fprintln(os.Stderr, "csv2md v" + VERSION)
-	fmt.Fprintln(os.Stderr, "Usage: csv2md data.csv > data.md")
-}
-
+// ExpandPath return absolute path to file replacing ~ to user's home folder
 func ExpandPath(path string) (string, error) {
 	homepath, err := os.UserHomeDir()
 	if err != nil {
@@ -45,22 +76,34 @@ func ExpandPath(path string) (string, error) {
 	return newpath, err
 }
 
-func readCsv(filePath string) [][]string {
+// readRawCsv read data from file
+func readCsvFile(filePath string) ([][]string, error) {
     f, err := os.Open(filePath)
     if err != nil {
-        log.Fatal("Unable to read input file " + filePath, err)
+    	return nil, errors.New("Failed to open file '" + filePath + "': " + err.Error())
     }
     defer f.Close()
 
     csvReader := csv.NewReader(f)
     records, err := csvReader.ReadAll()
     if err != nil {
-        log.Fatal("Unable to parse file as CSV for " + filePath, err)
+    	return nil, errors.New("Failed to parse CSV from file '" + filePath + "': " + err.Error())
     }
 
-    return records
+    return records, nil
+}
+
+// readRawCsv read data from stdin
+func readRawCsv() ([][]string, error) {
+    csvReader := csv.NewReader(os.Stdin)
+    records, err := csvReader.ReadAll()
+    if err != nil {
+    	return nil, errors.New("Failed to parse CSV from stdin: " + err.Error())
+    }
+    return records, nil
 }
 
+// convert format data from file or stdin as markdown
 func convert(records [][]string) []string {
 	var result []string
 	for idx, row := range records {
@@ -79,3 +122,27 @@ func convert(records [][]string) []string {
 	}
 	return result
 }
+
+// usage print help into writer
+func usage(writer *os.File) {
+	usage := []string{
+		"csv2md v" + VERSION,
+		"Anthony Axenov (c) 2022, MIT license",
+		"https://github.com/anthonyaxenov/csv2md",
+		"",
+		"Usage:",
+		"\tcsv2md (-h|-help|--help|help)    # to get this help",
+		"\tcsv2md example.csv               # convert data from file and write result in stdout",
+		"\tcsv2md < example.csv             # convert data from stdin and write result in stdout",
+		"\tcat example.csv | csv2md         # convert data from stdin and write result in stdout",
+		"\tcsv2md example.csv > example.md  # convert data from file and write result in new file",
+		"\tcsv2md example.csv | less        # convert data from file and write result in stdout using pager",
+		"\tcsv2md                           # paste or type data to stdin by hands",
+		"\t                                 # press Ctrl+D to view result in stdout",
+		"\tcsv2md > example.md              # paste or type data to stdin by hands",
+		"\t                                 # press Ctrl+D to write result in new file",
+	}
+	for _, str := range usage {
+		fmt.Fprintln(writer, str)
+	}
+}