Allow unmatched square-brackets in values (#782)

Co-authored-by: George Hansper <[email protected]>

src/augrun.c

@@ -176,7 +176,7 @@ static char *nexttoken(struct command *cmd, char **line, bool path) {
         if (nescaped == 0) {
             if (*s == '[') nbracket += 1;
             if (*s == ']') nbracket -= 1;
-            if (nbracket < 0) {
+            if (nbracket < 0 && path) {
                 ERR_REPORT(cmd, AUG_ECMDRUN, "unmatched [");
                 return NULL;
             }

tests/root/var/tmp/test-quoted-strings.txt

@@ -0,0 +1 @@
+find this: ]][ )( . * $ / \

tests/test-augtool/quoted-strings.sh

@@ -0,0 +1,35 @@
+#!/bin/bash
+#insert after /files/tmp/test-quoted-strings.txt/*[. =~ regexp('find.*')] 'found ['
+commands="
+set /files/var/tmp/test-quoted-strings.txt/01 '['
+set /files/var/tmp/test-quoted-strings.txt/02 ']'
+set /files/var/tmp/test-quoted-strings.txt/03 ']['
+set /files/var/tmp/test-quoted-strings.txt/04 '[]'
+set /files/var/tmp/test-quoted-strings.txt/05 '[]['
+set /files/var/tmp/test-quoted-strings.txt/06 '[]]'
+set /files/var/tmp/test-quoted-strings.txt/07 '('
+set /files/var/tmp/test-quoted-strings.txt/08 ')'
+set /files/var/tmp/test-quoted-strings.txt/09 '"\""'
+insert 010 after /files/var/tmp/test-quoted-strings.txt/seq::*[.=~regexp('.*\]\]\[ \)\( .*')]
+set /files/var/tmp/test-quoted-strings.txt/010 'found ]][ )('
+insert 011 after /files/var/tmp/test-quoted-strings.txt/seq::*[.=~regexp('.*\\\..*')]
+set /files/var/tmp/test-quoted-strings.txt/011 'found .'
+"
+lens=Simplelines.lns
+file="/var/tmp/test-quoted-strings.txt"
+
+diff='--- /var/tmp/test-quoted-strings.txt
++++ /var/tmp/test-quoted-strings.txt.augnew
+@@ -1 +1,12 @@
+ find this: ]][ )( . * $ / \
++found .
++found ]][ )(
++[
++]
++][
++[]
++[][
++[]]
++(
++)
++"'