Manage per-page limit while listing

Control how many gists we're going to get during list commands. Two ways
introduced:

1. Global variable `g:gist_per_page_limit` which is 30 by default. Set
   it to the value that will be used as a default number of gists per
   page in list commands.
2. Specify the number of gists for any list command explicitly `-n` or
   `--per-page` option:

```
:Gist -l -n 100
:Gist --list --per-page 100
```

Note that the page limit could not exceed 100 and should be a positive
number.

README.md

@@ -87,6 +87,10 @@ For the latest version please see https://github.com/mattn/vim-gist.
 
         :Gist -l mattn
 
+- Specify the number of gists listed:
+
+        :Gist -l -n 100
+
 - List everyone's gists.
 
         :Gist -la
@@ -188,6 +192,10 @@ You need to either set global git config:
 
 	$ git config --global github.user Username
 
+If you want to list more than 30 gists per page (maximum is 100):
+
+    let g:gist_per_page_limit = 100
+
 ## License:
 
     Copyright 2010 by Yasuhiro Matsumoto

autoload/gist.vim

@@ -171,7 +171,7 @@ endfunction
 
 " Note: A colon in the file name has side effects on Windows due to NTFS Alternate Data Streams; avoid it.
 let s:bufprefix = 'gist' . (has('unix') ? ':' : '_')
-function! s:GistList(gistls, page) abort
+function! s:GistList(gistls, page, pagelimit) abort
   if a:gistls ==# '-all'
     let url = g:gist_api_url.'gists/public'
   elseif get(g:, 'gist_show_privates', 0) && a:gistls ==# 'starred'
@@ -196,9 +196,11 @@ function! s:GistList(gistls, page) abort
       exec 'silent noautocmd split' s:bufprefix.a:gistls
     endif
   endif
+
+  let url = url . '?per_page=' . a:pagelimit
   if a:page > 1
     let oldlines = getline(0, line('$'))
-    let url = url . '?page=' . a:page
+    let url = url . '&page=' . a:page
   endif
 
   setlocal modifiable
@@ -527,7 +529,7 @@ function! s:GistListAction(mode) abort
     return
   endif
   if line =~# '^more\.\.\.$'
-    call s:GistList(b:gistls, b:page+1)
+    call s:GistList(b:gistls, b:page+1, g:gist_per_page_limit)
     return
   endif
 endfunction
@@ -767,6 +769,8 @@ function! gist#Gist(count, bang, line1, line2, ...) abort
   let editpost = 0
   let anonymous = get(g:, 'gist_post_anonymous', 0)
   let openbrowser = 0
+  let setpagelimit = 0
+  let pagelimit = g:gist_per_page_limit
   let listmx = '^\%(-l\|--list\)\s*\([^\s]\+\)\?$'
   let bufnamemx = '^' . s:bufprefix .'\(\zs[0-9a-f]\+\ze\|\zs[0-9a-f]\+\ze[/\\].*\)$'
   if strlen(g:github_user) == 0 && anonymous == 0
@@ -794,6 +798,14 @@ function! gist#Gist(count, bang, line1, line2, ...) abort
     elseif arg =~# '^\(-G\|--gitclone\)$\C' && gistidbuf !=# '' && g:gist_api_url ==# 'https://api.github.com/' && has_key(b:, 'gist') && has_key(b:gist, 'id')
       exe '!' printf('git clone [email protected]:%s', b:gist['id'])
       return
+    elseif setpagelimit == 1
+      let setpagelimit = 0
+      let pagelimit = str2nr(arg)
+      if pagelimit < 1 || pagelimit > 100
+        echohl ErrorMsg | echomsg 'Page limit should be between 1 and 100: '.arg | echohl None
+        unlet args
+        return 0
+      endif
     elseif arg =~# '^\(-la\|--listall\)$\C'
       let gistls = '-all'
     elseif arg =~# '^\(-ls\|--liststar\)$\C'
@@ -874,6 +886,14 @@ function! gist#Gist(count, bang, line1, line2, ...) abort
       endif
     elseif arg =~# '^\(-b\|--browser\)$\C'
       let openbrowser = 1
+    elseif arg =~# '^\(-n\|--per-page\)$\C'
+      if len(gistls) > 0
+        let setpagelimit = 1
+      else
+        echohl ErrorMsg | echomsg 'Page limit can be set only for list commands'.arg | echohl None
+        unlet args
+        return 0
+      endif
     elseif arg !~# '^-' && len(gistnm) == 0
       if gistdesc !=# ' '
         let gistdesc = matchstr(arg, '^\s*\zs.*\ze\s*$')
@@ -910,7 +930,7 @@ function! gist#Gist(count, bang, line1, line2, ...) abort
   endif
 
   if len(gistls) > 0
-    call s:GistList(gistls, 1)
+    call s:GistList(gistls, 1, pagelimit)
   elseif len(gistid) > 0 && editpost == 0 && deletepost == 0
     call s:GistGet(gistid, clipboard)
   else

doc/gist-vim.txt

@@ -102,6 +102,8 @@ USAGE                                                 *:Gist* *vim-gist-usage*
 
     :Gist -l
     :Gist --list
+    :Gist -l -n 100
+    :Gist --list --per-page 100
 <
 - List gists from user "mattn". >
 
@@ -201,6 +203,10 @@ If you want to open gist list/buffer as vertical split: >
 
     let g:gist_list_vsplit = 1
 
+If you want to list more than 30 gists per page (maximum is 100):
+
+    let g:gist_per_page_limit = 100
+
 If you want to modify filetype for the file on github, or add mapping of
 filetype/file-extension: >
 

plugin/gist.vim

@@ -12,12 +12,13 @@ endif
 let g:loaded_gist_vim = 1
 
 function! s:CompleteArgs(arg_lead,cmdline,cursor_pos)
-    return filter(copy(["-p", "-P", "-a", "-m", "-e", "-s", "-d", "+1", "-1", "-f", "-c", "-l", "-la", "-ls", "-b",
+    return filter(copy(["-p", "-P", "-a", "-m", "-e", "-s", "-d", "+1", "-1", "-f", "-c", "-l", "-la", "-ls", "-b", "-n",
                 \ "--listall", "--liststar", "--list", "--multibuffer", "--private", "--public", "--anonymous", "--description", "--clipboard",
-                \ "--rawurl", "--delete", "--edit", "--star", "--unstar", "--fork", "--browser"
+                \ "--rawurl", "--delete", "--edit", "--star", "--unstar", "--fork", "--browser", "--per-page"
                 \ ]), 'stridx(v:val, a:arg_lead)==0')
 endfunction
 
+let g:gist_per_page_limit = get(g:, 'gist_per_page_limit', 30)
 command! -nargs=? -range=% -bang -complete=customlist,s:CompleteArgs Gist :call gist#Gist(<count>, "<bang>", <line1>, <line2>, <f-args>)
 
 " vim:set et: