refactor(cpoptions): remove 'p'

Deleting a cpo flag a day keeps the doctor away

We don't need two different ways to indent LISP code

runtime/doc/options.txt

@@ -1720,9 +1720,6 @@ A jump table for the options with a short description can be found at |Q_op|.
 			when it didn't exist when editing it.  This is a
 			protection against a file unexpectedly created by
 			someone else.  Vi didn't complain about this.
-								*cpo-p*
-		p	Vi compatible Lisp indenting.  When not present, a
-			slightly better algorithm is used.
 								*cpo-P*
 		P	When included, a ":write" command that appends to a
 			file will set the file name for the current buffer, if

runtime/doc/vim_diff.txt

@@ -675,7 +675,7 @@ Options:
   bioskey (MS-DOS)
   conskey (MS-DOS)
   *'cp'* *'nocompatible'* *'nocp'* *'compatible'* (Nvim is always "nocompatible".)
-  'cpoptions' (gjkHw<*- and all POSIX flags were removed)
+  'cpoptions' (gjpkHw<*- and all POSIX flags were removed)
   *'cryptmethod'* *'cm'* *'key'* (Vim encryption implementation)
   cscopepathcomp
   cscopeprg

runtime/lua/vim/_meta/options.lua

@@ -1296,9 +1296,6 @@ vim.bo.ci = vim.bo.copyindent
 --- 		when it didn't exist when editing it.  This is a
 --- 		protection against a file unexpectedly created by
 --- 		someone else.  Vi didn't complain about this.
---- 							*cpo-p*
---- 	p	Vi compatible Lisp indenting.  When not present, a
---- 		slightly better algorithm is used.
 --- 							*cpo-P*
 --- 	P	When included, a ":write" command that appends to a
 --- 		file will set the file name for the current buffer, if

src/nvim/indent.c

@@ -1167,9 +1167,6 @@ int get_lisp_indent(void)
   pos_T paren;
   int amount;
 
-  // Set vi_lisp to use the vi-compatible method.
-  int vi_lisp = (vim_strchr(p_cpo, CPO_LISP) != NULL);
-
   pos_T realpos = curwin->w_cursor;
   curwin->w_cursor.col = 0;
 
@@ -1247,9 +1244,6 @@ int get_lisp_indent(void)
 
       char *that = get_cursor_line_ptr();
 
-      if (vi_lisp && (get_indent() == 0)) {
-        amount = 2;
-      } else {
       char *line = that;
       chartabsize_T cts;
       init_chartabsize_arg(&cts, curwin, pos->lnum, 0, line, line);
@@ -1265,8 +1259,7 @@ int get_lisp_indent(void)
       // non-standard-lisp ones are Scheme special forms):
       // (let ((a 1))    instead    (let ((a 1))
       //   (...))       of       (...))
-        if (!vi_lisp && ((*that == '(') || (*that == '['))
-            && lisp_match(that + 1)) {
+      if (((*that == '(') || (*that == '[')) && lisp_match(that + 1)) {
         amount += 2;
       } else {
         if (*that != NUL) {
@@ -1289,7 +1282,7 @@ int get_lisp_indent(void)
           // Not a comment line.
           // Test *that != '(' to accommodate first let/do
           // argument if it is more than one line.
-            if (!vi_lisp && (*that != '(') && (*that != '[')) {
+          if ((*that != '(') && (*that != '[')) {
             firsttry++;
           }
 
@@ -1297,14 +1290,11 @@ int get_lisp_indent(void)
 
           init_chartabsize_arg(&cts, curwin,
                                (colnr_T)(that - line), amount, line, that);
-            if (vi_lisp || ((*that != '"') && (*that != '\'')
-                            && (*that != '#')
+          if (((*that != '"') && (*that != '\'') && (*that != '#')
                && (((uint8_t)(*that) < '0') || ((uint8_t)(*that) > '9')))) {
             int quotecount = 0;
             while (*cts.cts_ptr
-                     && (!ascii_iswhite(*cts.cts_ptr) || quotecount || parencount)
-                     && (!((*cts.cts_ptr == '(' || *cts.cts_ptr == '[')
-                           && !quotecount && !parencount && vi_lisp))) {
+                   && (!ascii_iswhite(*cts.cts_ptr) || quotecount || parencount)) {
               if (*cts.cts_ptr == '"') {
                 quotecount = !quotecount;
               }
@@ -1336,7 +1326,6 @@ int get_lisp_indent(void)
         }
       }
     }
-    }
   } else {
     amount = 0;  // No matching '(' or '[' found, use zero indent.
   }

src/nvim/option_vars.h

@@ -151,7 +151,6 @@
 #define CPO_NUMCOL      'n'     // 'number' column also used for text
 #define CPO_LINEOFF     'o'
 #define CPO_OVERNEW     'O'     // silently overwrite new file
-#define CPO_LISP        'p'     // 'lisp' indenting
 #define CPO_FNAMEAPP    'P'     // set file name for ":w >>file"
 #define CPO_JOINCOL     'q'     // with "3J" use column after first join
 #define CPO_REDO        'r'

src/nvim/options.lua

@@ -1709,9 +1709,6 @@ return {
         		when it didn't exist when editing it.  This is a
         		protection against a file unexpectedly created by
         		someone else.  Vi didn't complain about this.
-        							*cpo-p*
-        	p	Vi compatible Lisp indenting.  When not present, a
-        		slightly better algorithm is used.
         							*cpo-P*
         	P	When included, a ":write" command that appends to a
         		file will set the file name for the current buffer, if

test/old/testdir/test_lispindent.vim

@@ -50,6 +50,7 @@ func Test_lisp_indent()
 
   set lisp
   set lispwords&
+  throw 'Skipped: cpo+=p not supported'
   let save_copt = &cpoptions
   set cpoptions+=p
   normal 1G=G