Include filename in input parse error message

Fixes jqlang#1553

src/main.c

@@ -731,14 +731,17 @@ int main(int argc, char* argv[]) {
 
       // Parse error
       jv msg = jv_invalid_get_msg(value);
+      jv input_pos = jq_util_input_get_position(jq);
       if (!(options & SEQ)) {
         ret = JQ_ERROR_UNKNOWN;
-        fprintf(stderr, "jq: parse error: %s\n", jv_string_value(msg));
+        fprintf(stderr, "jq: parse error (at %s): %s\n", jv_string_value(input_pos), jv_string_value(msg));
+        jv_free(input_pos);
         jv_free(msg);
         break;
       }
       // --seq -> errors are not fatal
-      fprintf(stderr, "jq: ignoring parse error: %s\n", jv_string_value(msg));
+      fprintf(stderr, "jq: ignoring parse error (at %s): %s\n", jv_string_value(input_pos), jv_string_value(msg));
+      jv_free(input_pos);
       jv_free(msg);
     }
   }

tests/shtest

@@ -103,28 +103,44 @@ if [ $n -ne $nref ]; then
   exit 1
 fi
 
+## Test parse error message
+echo 123 > $d/input_valid
+echo 456 > $d/input_error_line2
+echo asd >> $d/input_error_line2
+
+cat > $d/expected_out <<EOF
+123
+456
+EOF
+cat > $d/expected_err <<EOF
+jq: parse error (at $d/input_error_line2:2): Invalid numeric literal at line 4, column 0
+EOF
+$VALGRIND $Q $JQ -c . $d/input_valid $d/input_error_line2 > $d/out 2> $d/err || true
+cmp $d/out $d/expected_out
+cmp $d/err $d/expected_err
+
 ## Test JSON sequence support
 
 cat > $d/expected <<EOF
-jq: ignoring parse error: Truncated value at line 2, column 5
-jq: ignoring parse error: Truncated value at line 2, column 25
-jq: ignoring parse error: Truncated value at line 2, column 41
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 2, column 5
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 2, column 25
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 2, column 41
 EOF
 printf '1\0362 3\n[0,1\036[4,5]true"ab"{"c":4\036{}{"d":5,"e":6"\036false\n'|$VALGRIND $Q $JQ -ces --seq '. == [2,3,[4,5],true,"ab",{},false]' > /dev/null 2> $d/out
 cmp $d/out $d/expected
 
 cat > $d/expected <<EOF
-jq: ignoring parse error: Truncated value at line 2, column 5
-jq: ignoring parse error: Truncated value at line 2, column 25
-jq: ignoring parse error: Truncated value at line 3, column 1
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 2, column 5
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 2, column 25
+jq: ignoring parse error (at <stdin>:2): Truncated value at line 3, column 1
 EOF
 printf '1\0362 3\n[0,1\036[4,5]true"ab"{"c":4\036{}{"d":5,"e":6"false\n\036null'|$VALGRIND $Q $JQ -ces --seq '. == [2,3,[4,5],true,"ab",{},null]' > /dev/null 2> $d/out
 cmp $d/out $d/expected
 
 # Note that here jq sees no inputs at all but it still succeeds because
 # --seq ignores parse errors
 cat > $d/expected <<EOF
-jq: ignoring parse error: Unfinished abandoned text at EOF at line 1, column 4
+jq: ignoring parse error (at <stdin>:0): Unfinished abandoned text at EOF at line 1, column 4
 EOF
 printf '"foo' | $JQ -c --seq . > $d/out 2>&1
 cmp $d/out $d/expected
@@ -137,7 +153,7 @@ cmp $d/out $d/expected
 
 # Numeric values truncated by EOF are ignored
 cat > $d/expected <<EOF
-jq: ignoring parse error: Unfinished abandoned text at EOF at line 1, column 1
+jq: ignoring parse error (at <stdin>:0): Unfinished abandoned text at EOF at line 1, column 1
 EOF
 printf '1' | $JQ -c --seq . > $d/out 2>&1
 cmp $d/out $d/expected