__ini_value: implement multi-line buffer

This buffer gives the ability to look a bit longer into the past than
just a single line. This is helpfull to get a bigger context when
fiddling around comments. This also erases the need of
`lastlinepopulated` as there is something in the pipe or nothing.

cdist/conf/type/__ini_value/files/base.awk

@@ -1,6 +1,7 @@
 BEGIN {
-    #bufindex = 0
-    #maxbuflen = 2
+    bufindex = -1
+    buflen = 0
+    maxbuflen = 2
 
     # no section means the start to the first section
     if(section == "") {
@@ -9,15 +10,31 @@ BEGIN {
     }
 }
 
-# legacy function
+# controls the line buffer
 function flush_buffer() {
-    #while(bufindex > 0) {
-    #    _pop_buffer()
-    #}
-    if(lastlinepopulated) {
-        print lastline
-        lastlinepopulated = 0
-    }
+    while(buflen > 0)
+        _pop_line()
+}
+function push_line() {
+    linebuf[++bufindex] = $0
+    buflen++;
+    while(buflen > maxbuflen) _pop_line()
+}
+function revert_line() {
+    # no delete, because it will be overwritten by the next line if any ..
+    bufindex--
+    buflen--
+}
+function lastline() {
+    if(buflen > 0) return linebuf[bufindex]
+}
+function pop_line() {
+    if(buflen > 0) _pop_line()
+}
+function _pop_line() {
+    _index = bufindex - (--buflen)
+    print linebuf[_index]
+    delete linebuf[_index]
 }
 
 # excepts the first character is the sign to check (string is trimmed)
@@ -47,18 +64,10 @@ found {print; next}
     line = trim($0)
     # short curcit on empty lines
     if(line == "") {
-        # TODO code to function!
-        flush_buffer()
-        lastline = $0
-        lastlinepopulated = 1
+        push_line()
         next
     }
 
-    # write to linebuffer
-    #if(bufindex > maxbuflen)
-    #    _pop_buffer()
-    #linebuffer[++bufindex] = $0
-
     # check for a ini section
     if(substr(line, 1, 1) == "[" && substr(line, length(line), 1) == "]") {
         is_section = 1
@@ -104,12 +113,8 @@ found {print; next}
         }
     }
 
-    # TODO
     # works cause no next statement from above *structual programming*
-    #print lastline
-    flush_buffer()
-    lastline = $0
-    lastlinepopulated = 1
+    push_line()
 }
 
 END {

cdist/conf/type/__ini_value/files/parts/absent/found.awk

@@ -1,3 +1,5 @@
-# flush last line if it was not the meant comment
-if(!was_comment(lastline, comment)) flush_buffer()
-else lastlinepopulated = 0
+# revert line if it was a comment
+if(was_comment(lastline, comment)) revert_line()
+
+# value line was not pushed to the buffer yet
+flush_buffer()

cdist/conf/type/__ini_value/files/parts/commented/found.awk

@@ -1,5 +1,5 @@
 # check if last line was the comment
-was_com_there = was_comment(lastline, comment)
+was_com_there = was_comment(lastline(), comment)
 
 # print + comment if not there
 flush_buffer()

cdist/conf/type/__ini_value/files/parts/commented/insert.awk

@@ -1,4 +1,4 @@
-was_com_there = was_comment(lastline, comment)
+was_com_there = was_comment(lastline(), comment)
 
 # print before and comment
 flush_buffer()

cdist/conf/type/__ini_value/files/parts/present/found.awk

@@ -1,5 +1,5 @@
 # check if last line was the comment
-was_com_there = was_comment(lastline, comment)
+was_com_there = was_comment(lastline(), comment)
 
 # print + comment if not there
 flush_buffer()

cdist/conf/type/__ini_value/files/parts/present/insert.awk

@@ -1,4 +1,4 @@
-was_com_there = was_comment(lastline, comment)
+was_com_there = was_comment(lastline(), comment)
 
 # print before and comment
 flush_buffer()