patch 8.0.1685: can't set ANSI colors of a terminal window

Problem:    Can't set ANSI colors of a terminal window.
Solution:   Add term_setansicolors(), term_getansicolors() and
            g:term_ansi_colors. (Andy Massimino, closes #2747)

runtime/doc/eval.txt

@@ -2423,6 +2423,7 @@ term_dumpload({filename} [, {options}])
 term_dumpwrite({buf}, {filename} [, {options}])
 				none	dump terminal window contents
 term_getaltscreen({buf})	Number	get the alternate screen flag
+term_getansicolors({buf})	List	get ANSI palette in GUI color mode
 term_getattr({attr}, {what})	Number	get the value of attribute {what}
 term_getcursor({buf})		List	get the cursor position of a terminal
 term_getjob({buf})		Job	get the job associated with a terminal
@@ -2435,6 +2436,8 @@ term_gettty({buf}, [{input}])	String	get the tty name of a terminal
 term_list()			List	get the list of terminal buffers
 term_scrape({buf}, {row})	List	get row of a terminal screen
 term_sendkeys({buf}, {keys})	none	send keystrokes to a terminal
+term_setansicolors({buf}, {colors})
+				none	set ANSI palette in GUI color mode
 term_setkill({buf}, {how}) 	none	set signal to stop job in terminal
 term_setrestore({buf}, {command}) none	set command to restore terminal
 term_start({cmd}, {options})	Job	open a terminal window and run a job
@@ -8248,6 +8251,18 @@ term_getaltscreen({buf})				*term_getaltscreen()*
 		{buf} is used as with |term_getsize()|.
 		{only available when compiled with the |+terminal| feature}
 
+term_getansicolors({buf})				*term_getansicolors()*
+		Get the ANSI color palette in use by terminal {buf}.
+		Returns a List of length 16 where each element is a String
+		representing a color in hexadecimal "#rrggbb" format.
+		Also see |term_setansicolors()| and |g:terminal_ansi_colors|.
+		If neither was used returns the default colors.
+
+		{buf} is used as with |term_getsize()|.  If the buffer does not
+		exist or is not a terminal window, an empty list is returned.
+		{only available when compiled with the |+terminal| feature and
+		with GUI enabled and/or the |+termguicolors| feature}
+
 term_getattr({attr}, {what})				*term_getattr()*
 		Given {attr}, a value returned by term_scrape() in the "attr"
 		item, return whether {what} is on.  {what} can be one of:
@@ -8379,6 +8394,19 @@ term_sendkeys({buf}, {keys})				*term_sendkeys()*
 		means the character CTRL-X.
 		{only available when compiled with the |+terminal| feature}
 
+term_setansicolors({buf}, {colors})			*term_setansicolors()*
+		Set the ANSI color palette used by terminal {buf}.
+		{colors} must be a List of 16 valid color names or hexadecimal
+		color codes, like those accepted by |highlight-guifg|.
+		Also see |term_getansicolors()| and |g:terminal_ansi_colors|.
+
+		These colors are used in the GUI and in the terminal when
+		'termguicolors' is set.  When not using GUI colors (GUI mode
+		or |termguicolors|), the terminal window always uses the 16
+		ANSI colors of the underlying terminal.
+		{only available when compiled with the |+terminal| feature and
+		with GUI enabled and/or the |+termguicolors| feature}
+
 term_setkill({buf}, {how})				*term_setkill()*
 		When exiting Vim or trying to close the terminal window in
 		another way, {how} defines whether the job in the terminal can
@@ -8463,6 +8491,9 @@ term_start({cmd}, {options})				*term_start()*
 				     CTRL-D is used on MS-Windows. For Python
 				     use CTRL-Z or "exit()". For a shell use
 				     "exit".  A CR is always added.
+		   "ansi_colors"     A list of 16 color names or hex codes
+				     defining the ANSI palette used in GUI
+				     color modes.  See |g:terminal_ansi_colors|.
 
 		{only available when compiled with the |+terminal| feature}
 

runtime/doc/terminal.txt

@@ -136,6 +136,16 @@ terminal window will start with a white or black background.
 To use a different color the Terminal highlight group can be used, for
 example: >
     hi Terminal ctermbg=lightgrey ctermfg=blue guibg=lightgrey guifg=blue
+<
+							*g:terminal_ansi_colors*
+In GUI mode or with |termguicolors|, the 16 ANSI colors used by default in new
+terminal windows may be configured using the variable
+`g:terminal_ansi_colors`, which should be a list of 16 color names or
+hexadecimal color codes, similar to those accepted by |highlight-guifg|.  When
+not using GUI colors, the terminal window always uses the 16 ANSI colors of
+the underlying terminal.
+The |term_setansicolors()| function can be used to change the colors, and
+|term_getansicolors()| to get the currently used colors.
 
 
 Syntax ~

src/channel.c

@@ -4802,6 +4802,50 @@ get_job_options(typval_T *tv, jobopt_T *opt, int supported, int supported2)
 		opt->jo_set2 |= JO2_TERM_KILL;
 		opt->jo_term_kill = get_tv_string_chk(item);
 	    }
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+	    else if (STRCMP(hi->hi_key, "ansi_colors") == 0)
+	    {
+		int 		n = 0;
+		listitem_T	*li;
+		long_u		rgb[16];
+
+		if (!(supported2 & JO2_ANSI_COLORS))
+		    break;
+
+		if (item == NULL || item->v_type != VAR_LIST
+			|| item->vval.v_list == NULL)
+		{
+		    EMSG2(_(e_invargval), "ansi_colors");
+		    return FAIL;
+		}
+
+		li = item->vval.v_list->lv_first;
+		for (; li != NULL && n < 16; li = li->li_next, n++)
+		{
+		    char_u	*color_name;
+		    guicolor_T 	guicolor;
+
+		    color_name = get_tv_string_chk(&li->li_tv);
+		    if (color_name == NULL)
+			return FAIL;
+
+		    guicolor = GUI_GET_COLOR(color_name);
+		    if (guicolor == INVALCOLOR)
+			return FAIL;
+
+		    rgb[n] = GUI_MCH_GET_RGB(guicolor);
+		}
+
+		if (n != 16 || li != NULL)
+		{
+		    EMSG2(_(e_invargval), "ansi_colors");
+		    return FAIL;
+		}
+
+		opt->jo_set2 |= JO2_ANSI_COLORS;
+		memcpy(opt->jo_ansi_colors, rgb, sizeof(rgb));
+	    }
+# endif
 #endif
 	    else if (STRCMP(hi->hi_key, "env") == 0)
 	    {

src/evalfunc.c

@@ -856,6 +856,9 @@ static struct fst
     {"term_dumpload",	1, 2, f_term_dumpload},
     {"term_dumpwrite",	2, 3, f_term_dumpwrite},
     {"term_getaltscreen", 1, 1, f_term_getaltscreen},
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+    {"term_getansicolors", 1, 1, f_term_getansicolors},
+# endif
     {"term_getattr",	2, 2, f_term_getattr},
     {"term_getcursor",	1, 1, f_term_getcursor},
     {"term_getjob",	1, 1, f_term_getjob},
@@ -868,6 +871,9 @@ static struct fst
     {"term_list",	0, 0, f_term_list},
     {"term_scrape",	2, 2, f_term_scrape},
     {"term_sendkeys",	2, 2, f_term_sendkeys},
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+    {"term_setansicolors", 2, 2, f_term_setansicolors},
+# endif
     {"term_setkill",	2, 2, f_term_setkill},
     {"term_setrestore",	2, 2, f_term_setrestore},
     {"term_start",	1, 2, f_term_start},

src/proto/terminal.pro

@@ -32,6 +32,7 @@ int term_swap_diff(void);
 void f_term_dumpdiff(typval_T *argvars, typval_T *rettv);
 void f_term_dumpload(typval_T *argvars, typval_T *rettv);
 void f_term_getaltscreen(typval_T *argvars, typval_T *rettv);
+void f_term_getansicolors(typval_T *argvars, typval_T *rettv);
 void f_term_getattr(typval_T *argvars, typval_T *rettv);
 void f_term_getcursor(typval_T *argvars, typval_T *rettv);
 void f_term_getjob(typval_T *argvars, typval_T *rettv);
@@ -44,6 +45,7 @@ void f_term_gettty(typval_T *argvars, typval_T *rettv);
 void f_term_list(typval_T *argvars, typval_T *rettv);
 void f_term_scrape(typval_T *argvars, typval_T *rettv);
 void f_term_sendkeys(typval_T *argvars, typval_T *rettv);
+void f_term_setansicolors(typval_T *argvars, typval_T *rettv);
 void f_term_setrestore(typval_T *argvars, typval_T *rettv);
 void f_term_setkill(typval_T *argvars, typval_T *rettv);
 void f_term_start(typval_T *argvars, typval_T *rettv);

src/structs.h

@@ -1708,7 +1708,7 @@ struct channel_S {
 #define JO2_EOF_CHARS	    0x1000	/* "eof_chars" */
 #define JO2_NORESTORE	    0x2000	/* "norestore" */
 #define JO2_TERM_KILL	    0x4000	/* "term_kill" */
-#define JO2_ALL		    0x7FFF
+#define JO2_ANSI_COLORS	    0x8000	/* "ansi_colors" */
 
 #define JO_MODE_ALL	(JO_MODE + JO_IN_MODE + JO_OUT_MODE + JO_ERR_MODE)
 #define JO_CB_ALL \
@@ -1777,6 +1777,9 @@ typedef struct
     int		jo_term_finish;
     char_u	*jo_eof_chars;
     char_u	*jo_term_kill;
+# if defined(FEAT_GUI) || defined(FEAT_TERMGUICOLORS)
+    long_u	jo_ansi_colors[16];
+# endif
 #endif
 } jobopt_T;