print error values on halt_error (close #109)

cli/cli.go

@@ -425,7 +425,18 @@ func (cli *cli) funcStderr(v interface{}, _ []interface{}) interface{} {
 
 func (cli *cli) printError(err error) {
 	if er, ok := err.(interface{ IsEmptyError() bool }); !ok || !er.IsEmptyError() {
-		fmt.Fprintf(cli.errStream, "%s: %s\n", name, err)
+		if er, ok := err.(interface{ IsHaltError() bool }); !ok || !er.IsHaltError() {
+			fmt.Fprintf(cli.errStream, "%s: %s\n", name, err)
+		} else if er, ok := err.(gojq.ValueError); ok {
+			v := er.Value()
+			if str, ok := v.(string); ok {
+				cli.errStream.Write([]byte(str))
+			} else {
+				bs, _ := gojq.Marshal(v)
+				cli.errStream.Write(bs)
+				cli.errStream.Write([]byte{'\n'})
+			}
+		}
 	}
 }
 

cli/cli_test.go

@@ -110,7 +110,7 @@ func TestCliRun(t *testing.T) {
 				if got, expected := errorReplacer.Replace(errStr), strings.TrimSpace(tc.Error); !strings.Contains(got, expected) {
 					t.Error("standard error output:\n" + cmp.Diff(expected, got))
 				}
-				if !strings.HasSuffix(errStr, "\n") && !strings.Contains(tc.Name, "stderr") {
+				if !strings.HasSuffix(errStr, "\n") && !strings.Contains(tc.Name, "stderr") && !strings.Contains(tc.Name, "halt_error") {
 					t.Error(`standard error output should end with "\n"`)
 				}
 				if strings.HasSuffix(errStr, "\n\n") {

cli/test.yaml

@@ -4366,23 +4366,23 @@
     - 'halt_error'
   input: '1'
   error: |
-    error: 1
+    1
   exit_code: 5
 
 - name: halt_error/0 function
   args:
     - '0/0 | halt_error'
   input: 'null'
   error: |
-    error: null
+    null
   exit_code: 5
 
 - name: halt_error/0 function and try catch
   args:
     - 'range(5) | try halt_error catch .'
   input: 'null'
   error: |
-    error: 0
+    0
   exit_code: 5
 
 - name: halt_error/0 function with null input and try catch
@@ -4391,6 +4391,19 @@
   input: 'null'
   exit_code: 5
 
+- name: halt_error/0 function with multiple input values
+  args:
+    - 'halt_error'
+  input: |
+    1
+    2
+    3
+  error: |
+    1
+    2
+    3
+  exit_code: 5
+
 - name: halt_error/0 function and raw strings input option
   args:
     - -R
@@ -4400,9 +4413,7 @@
     2
     3
   error: |
-    error: 1
-    error: 2
-    error: 3
+    123
   exit_code: 5
 
 - name: halt_error/1 function

error.go

@@ -129,12 +129,16 @@ func (err *exitCodeError) IsEmptyError() bool {
 	return err.value == nil
 }
 
+func (err *exitCodeError) Value() interface{} {
+	return err.value
+}
+
 func (err *exitCodeError) ExitCode() int {
 	return err.code
 }
 
-func (err *exitCodeError) Value() interface{} {
-	return err.value
+func (err *exitCodeError) IsHaltError() bool {
+	return err.halt
 }
 
 type funcContainsError struct {