Fix a typo

The README is not a sufficient enough source of information. It is
easier for vim users to access the documentation through vim itself
using the standard vim documentation.

README.md

@@ -1,6 +1,8 @@
 vim-dnsserial
 =============
 
+[![Apache License 2.0](https://img.shields.io/github/license/breard-r/vim-dnsserial.svg "Apache License 2.0")](https://www.apache.org/licenses/LICENSE-2.0.html)
+
 Another DNS-zone serial number updater.
 
 
@@ -15,3 +17,105 @@ I know this not the first vim plugin available to update a DNS-zone serial numbe
 * it lacks functionalities.
 
 It chose not to fork the original plugin but to write a new one from scratch mainly for legal purposes, but also because I did not found the code as simple as I expected.
+
+
+Status
+------
+
+This project is passively maintained. If there is no recent commits it is because:
+
+- I did not encountered a bug and nobody reported any.
+- I am happy with the functionalities and nobody asked for new ones.
+- It works on both vim and neovim.
+
+If you need anything, please open an issue.
+
+
+Usage
+-----
+
+By default, each time you save a `bindzone` file, the script will look for the DNS serial number and update it. You can also update it without saving the file by invoking the `:DNSSerialUpdate` function.
+
+
+Patterns
+--------
+
+In order to be detected, the DNS serial number must match one the following pattern:
+
+* `YYYYMMDDXX ; serial`
+  - `YYYY` is the year (4 digits, must start by either `19` or `2`);
+  - `MM` is the month (2 digits);
+  - `DD` is the day (2 digits);
+  - `XX` is any non-negative number (1 or more digits);
+  - the word `serial` is not case-sensitive;
+  - there can be any number of blanks on each sides of the semicolon.
+
+* `SSSSSSSSSS ; serial`
+  - `SSSSSSSSSS` is the UNIX timestamp (10 digits, must start by `1`);
+  - the word `serial` is not case-sensitive;
+  - there can be any number of blanks on each sides of the semicolon.
+
+* `XX ; serial`
+  - `XX` is any non-negative number (1 or more digits);
+  - the word `serial` is not case-sensitive;
+  - there can be any number of blanks on each sides of the semicolon.
+
+According to those patterns, only dates between 1900 and 2999 will be detected; however this should not be a problem at all. Most importantly, only timestamps between September 9 2001 and March 17 2030 will be detected.
+
+
+Configuration
+-------------
+
+You can set several configuration variables in your vimrc:
+
+* `g:dnsserial_auto_update`: Defines whether or not the serial is updated when the zone file is saved (default is 1, set it to 0 to disable).
+* `g:dnsserial_custom_patterns`: List of customs patterns that will be added to the default ones. Order matters, the first matching patters will be used. Customs patterns will be tested before the default ones.
+* `g:dnsserial_patterns`: List of default patterns. It is not advised to change it.
+
+
+Custom patterns
+---------------
+
+A pattern is defined by a dictionary with two keys: `regex` and `matching`.
+
+**regex**
+
+Contains the regular expression that will be used to search the document for the serial number. All the components of the serial number must be captured with parenthesis.
+
+**matching**
+
+This is a list of every components of the serial number. Each component is defined by a dictionary. The `type` key must be present and contain one of the allowed types. Depending on the type, several additional keys might be defined. Authorized types and their options are:
+
+* `raw`: Raw string.
+* `integer`: An integer that will be incremented.
+- `offset` (int): set the offset by which the integer is incremented. Default is 1.
+- `padding` (int): Force the integer to be 0-padded on the associated number of digits.
+- `date_reset` (bool): If set to 1 and a the serial contains a `date`, the integer will be reseted to 0 if the date is updated. Default is 0.
+* `date`: A formated date that will be updated to the current one.
+- `fmt` (string, mandatory) : the date format according to the `strftime()` specifications. See `:help strftime` for more details.
+
+**examples**
+
+A simple pattern matching a serial defined as an integer and followed by a comment starting by the word `serial` is:
+
+```js
+{
+  'regex': '\(\d\+\)\s*;\s*\cserial',
+  'matching': [
+    {'type': 'integer'}
+  ]
+}
+```
+
+The same example, but having the serial number starting by the current date (YYYYMMDD) and the integer padded on two digits:
+
+
+```js
+{
+  'regex': '\(\d\{8}\)\(\d\+\)\s*;\s*\cserial',
+  'matching': [
+    {'type': 'date', 'fmt': '%Y%m%d'},
+    {'type': 'integer', 'padding': 2, 'date_reset': 1}
+  ]
+}
+```

autoload/dnsserial.vim

@@ -12,28 +12,59 @@
 " See the License for the specific language governing permissions and
 " limitations under the License.
 
-function! s:IncrementSerial(old_date, old_nb)
-    let curr_date = strftime("%Y%m%d")
-    if a:old_date ==? curr_date
-        let curr_nb = a:old_nb + 1
-        if curr_nb < 10
-            let curr_nb = "0".curr_nb
+
+function! s:HasDateChanged(pattern, old_matchlist)
+    let i = 0
+    for matching in a:pattern.matching
+        if matching.type ==? 'date'
+            let old_date = a:old_matchlist[i]
+            let new_date = strftime(matching.fmt)
+            if old_date !=? new_date
+                return 1
             endif
-    else
-        let curr_nb = "01"
         endif
-    return curr_date.curr_nb
+        let i += 1
+    endfor
+    return 0
+endfunction
+
+function! s:GetNewValue(matching, old_value, date_changed)
+    if a:matching.type ==? 'date'
+        return strftime(a:matching.fmt)
+    elseif a:matching.type ==? 'integer'
+        let nb = a:old_value + get(a:matching, 'offset', 1)
+        if a:date_changed && get(a:matching, 'date_reset', 0)
+            let nb = 0
+        endif
+        return printf('%0' . get(a:matching, 'padding', 1) . 'd', nb)
+    endif
+    return a:old_value
+endfunction
+
+function! s:GetNewSerial(pattern, old_matchlist)
+    let date_changed = s:HasDateChanged(a:pattern, a:old_matchlist)
+    let new_serial = []
+    let i = 0
+    for matching in a:pattern.matching
+        let new_value = s:GetNewValue(matching, a:old_matchlist[i], date_changed)
+        call add(new_serial, new_value)
+        let i += 1
+    endfor
+    return join(new_serial, '')
 endfunction
 
 function! dnsserial#DNSSerialUpdate()
-    let pattern = '\(\d\{8}\)\(\d\+\)\s*;\s*\cserial'
-    if search(pattern) == 0
-        echom "No serial found."
-        return 0
-    endif
-    let old_pattern = matchlist(getline('.'), pattern)
-    let old_serial = old_pattern[1].old_pattern[2]
-    let new_serial = s:IncrementSerial(old_pattern[1], old_pattern[2])
+    let patterns = g:dnsserial_custom_patterns + g:dnsserial_patterns
+    for pattern in patterns
+        if search(pattern.regex) != 0
+            let offset = len(pattern.matching)
+            let old_matchlist = matchlist(getline('.'), pattern.regex)[1:offset]
+            let old_serial = join(old_matchlist, '')
+            let new_serial = s:GetNewSerial(pattern, old_matchlist)
             execute "s/" . old_serial . "/" . new_serial . "/"
             echom "Serial updated to " . new_serial . "."
+            return 0
+        endif
+    endfor
+    echom "No serial found."
 endfunction

doc/dnsserial.txt

@@ -0,0 +1,147 @@
+*dnsserial.txt* another DNS-zone serial number updater
+
+           ____  _   _ ____                _       _ ~
+          |  _ \| \ | / ___| ___  ___ _ __(_) __ _| |~
+          | | | |  \| \___ \/ __|/ _ \ '__| |/ _` | |~
+          | |_| | |\  |___) \__ \  __/ |  | | (_| | |~
+          |____/|_| \_|____/|___/\___|_|  |_|\__,_|_|~
+
+          Another DNS-zone serial number updater.
+
+==============================================================================
+CONTENTS                                                   *DNSserialContents*
+
+    1. Introduction ......... |DNSserial|
+    2. Usage ................ |DNSserialUsage|
+    3. Patterns ............. |DNSserialPatterns|
+    4. Configuration ........ |DNSserialConfiguration|
+    5. Custom patterns ...... |DNSserialCustomPatterns|
+        5.1 regex ........... |DNSserialCustomPatterns-regex|
+        5.2 matching ........ |DNSserialCustomPatterns-matching|
+        5.3 examples ........ |DNSserialCustomPatterns-examples|
+    6. License .............. |DNSserialLicense|
+
+==============================================================================
+Section 1: Introduction                                            *DNSserial*
+
+I know this not the first vim plugin available to update a DNS-zone serial
+number. Here is a few reasons why I chose not to use the canonical one:
+
+ - there is no license and therefore it is not free;
+ - it is unmaintained;
+ - it is bugged;
+ - it lacks functionalities.
+
+It chose not to fork the original plugin but to write a new one from scratch
+mainly for legal purposes, but also because I did not found the code as simple
+as I expected.
+
+==============================================================================
+Section 2: Usage                                              *DNSserialUsage*
+
+By default, each time you save a bindzone file, the script will look for the
+DNS serial number and update it. You can also update it without saving the
+file by invoking the :DNSSerialUpdate function.
+
+==============================================================================
+Section 3: Patterns                                        *DNSserialPatterns*
+
+In order to be detected, the DNS serial number must match one the following
+pattern:
+
+ - YYYYMMDDXX ; serial
+   * YYYY is the year (4 digits, must start by either 19 or 2);
+   * MM is the month (2 digits);
+   * DD is the day (2 digits);
+   * XX is any non-negative number (1 or more digits);
+   * the word serial is not case-sensitive;
+   * there can be any number of blanks on each sides of the semicolon.
+
+ - SSSSSSSSSS ; serial
+   * SSSSSSSSSS is the UNIX tiemstamp (10 digits, must start by 1);
+   * the word serial is not case-sensitive;
+   * there can be any number of blanks on each sides of the semicolon.
+
+ - XX ; serial
+   * XX is any non-negative number (1 or more digits);
+   * the word serial is not case-sensitive;
+   * there can be any number of blanks on each sides of the semicolon.
+
+According to those patterns, only dates between 1900 and 2999 will be
+detected; however this should not be a problem at all. Most importantly, only
+timestamps between September 9 2001 and March 17 2030 will be detected.
+
+==============================================================================
+Section 4: Configuration                              *DNSserialConfiguration*
+
+You can set several configuration variables in your vimrc:
+
+ - g:dnsserial_auto_update: Defines whether or not the serial is updated when
+   the zone file is saved (default is 1, set it to 0 to disable).
+ - g:dnsserial_custom_patterns: List of customs patterns that will be added to
+   the default ones. Order matters, the first matching patters will be used.
+   Customs patterns will be tested before the default ones.
+ - g:dnsserial_patterns: List of default patterns. It is not advised to change
+   it.
+
+==============================================================================
+Section 5: Custom patterns                           *DNSserialCustomPatterns*
+
+A pattern is defined by a dictionary with two keys: regex and matching.
+
+------------------------------------------------------------------------------
+Section 5.1: regex                             *DNSserialCustomPatterns-regex*
+
+Contains the regular expression that will be used to search the document for
+the serial number. All the components of the serial number must be captured
+with parenthesis.
+
+------------------------------------------------------------------------------
+Section 5.1: matching                       *DNSserialCustomPatterns-matching*
+
+This is a list of every components of the serial number. Each component is
+defined by a dictionary. The type key must be present and contain one of the
+allowed types. Depending on the type, several additional keys might be
+defined. Authorized types and their options are:
+
+ - raw: Raw string.
+ - integer: An integer that will be incremented.
+ - offset (int): set the offset by which the integer is incremented. Default
+   is 1.
+ - padding (int): Force the integer to be 0-padded on the associated number of
+   digits.
+ - date_reset (bool): If set to 1 and a the serial contains a date, the
+   integer will be reseted to 0 if the date is updated. Default is 0.
+ - date: A formated date that will be updated to the current one.
+ - fmt (string, mandatory) : the date format according to the strftime()
+   specifications. See :help strftime for more details.
+
+------------------------------------------------------------------------------
+Section 5.1: examples                       *DNSserialCustomPatterns-examples*
+
+A simple pattern matching a serial defined as an integer and followed by a
+comment starting by the word serial is:
+
+    {
+      'regex': '\(\d\+\)\s*;\s*\cserial',
+      'matching': [
+        {'type': 'integer'}
+      ]
+    }
+
+The same example, but having the serial number starting by the current date
+(YYYYMMDD) and the integer padded on two digits:
+
+    {
+      'regex': '\(\d\{8}\)\(\d\+\)\s*;\s*\cserial',
+      'matching': [
+        {'type': 'date', 'fmt': '%Y%m%d'},
+        {'type': 'integer', 'padding': 2, 'date_reset': 1}
+      ]
+    }
+
+==============================================================================
+Section 6: License                                          *DNSserialLicense*
+
+DNSserial is Copyright 2015 Rodolphe Breard and is licensed under the Apache
+License, Version 2.0.

ftplugin/bindzone.vim

@@ -13,7 +13,13 @@
 " limitations under the License.
 
 
+if !exists('g:dnsserial_auto_update')
+    let g:dnsserial_auto_update = 1
+endif
+
+if g:dnsserial_auto_update
     augroup dnsserial
         autocmd!
         autocmd BufWritePre <buffer> DNSSerialUpdate
     augroup END
+endif

plugin/dnsserial.vim

@@ -12,4 +12,36 @@
 " See the License for the specific language governing permissions and
 " limitations under the License.
 
+
+if !exists('g:dnsserial_custom_patterns')
+    let g:dnsserial_custom_patterns = []
+endif
+
+if !exists('g:dnsserial_patterns')
+    let g:dnsserial_patterns = [
+        \{
+            \'regex': '\(19\d\{2}\|20\d\{2}\)\([01]\d\)\([0-3]\d\)\(\d\+\)\s*;\s*\cserial',
+            \'matching': [
+                \{'type': 'date', 'fmt': '%Y'},
+                \{'type': 'date', 'fmt': '%m'},
+                \{'type': 'date', 'fmt': '%d'},
+                \{'type': 'integer', 'padding': 2, 'date_reset': 1}
+            \]
+        \},
+        \{
+            \'regex': '\(1\d\{9}\)\s*;\s*\cserial',
+            \'matching': [
+                \{'type': 'date', 'fmt': '%s'},
+            \]
+        \},
+        \{
+            \'regex': '\(\d\+\)\s*;\s*\cserial',
+            \'matching': [
+                \{'type': 'integer'}
+            \]
+        \},
+    \]
+endif
+
+
 command! DNSSerialUpdate call dnsserial#DNSSerialUpdate()