escape the null character in csv, tsv, sh formats (close #200)

Author: itchyny

cli/test.yaml

@@ -5848,9 +5848,9 @@
   args:
     - '@csv'
   input: |
-    [1, "foo", null, "foo,\n\"bar\"\tbaz"]
+    [1, "foo", null, "foo,\n\"bar\"\tbaz\u0000\\0"]
   expected: |
-    "1,\"foo\",,\"foo,\n\"\"bar\"\"\tbaz\""
+    "1,\"foo\",,\"foo,\n\"\"bar\"\"\tbaz\\0\\0\""
 
 - name: format strings @csv with string interpolation
   args:
@@ -5879,9 +5879,9 @@
   args:
     - '@tsv'
   input: |
-    [1, "foo", null, "foo,\n\"bar\"\tba\\z"]
+    [1, "foo", null, "foo,\n\"bar\"\tbaz\u0000\\0"]
   expected: |
-    "1\tfoo\t\tfoo,\\n\"bar\"\\tba\\\\z"
+    "1\tfoo\t\tfoo,\\n\"bar\"\\tbaz\\0\\\\0"
 
 - name: format strings @tsv with string interpolation
   args:
@@ -5912,11 +5912,11 @@
   input: |
     null
     true
-    [1, "f'o'o", null, false]
+    [1, "f'o'o\u0000\\0", null, false]
   expected: |
     "null"
     "true"
-    "1 'f'\\''o'\\''o' null false"
+    "1 'f'\\''o'\\''o\\0\\0' null false"
 
 - name: format strings @sh error
   args:

func.go

@@ -808,9 +808,14 @@ func funcToURI(v interface{}) interface{} {
 	}
 }
 
+var csvEscaper = strings.NewReplacer(
+	`"`, `""`,
+	"\x00", `\0`,
+)
+
 func funcToCSV(v interface{}) interface{} {
 	return formatJoin("csv", v, ",", func(s string) string {
-		return `"` + strings.ReplaceAll(s, `"`, `""`) + `"`
+		return `"` + csvEscaper.Replace(s) + `"`
 	})
 }
 
@@ -819,18 +824,24 @@ var tsvEscaper = strings.NewReplacer(
 	"\r", `\r`,
 	"\n", `\n`,
 	"\\", `\\`,
+	"\x00", `\0`,
 )
 
 func funcToTSV(v interface{}) interface{} {
 	return formatJoin("tsv", v, "\t", tsvEscaper.Replace)
 }
 
+var shEscaper = strings.NewReplacer(
+	"'", `'\''`,
+	"\x00", `\0`,
+)
+
 func funcToSh(v interface{}) interface{} {
 	if _, ok := v.([]interface{}); !ok {
 		v = []interface{}{v}
 	}
 	return formatJoin("sh", v, " ", func(s string) string {
-		return "'" + strings.ReplaceAll(s, "'", `'\''`) + "'"
+		return "'" + shEscaper.Replace(s) + "'"
 	})
 }