GUACAMOLE-470: Support configurable colors in color-scheme parameter.

Add support for configuring individual colors in the color-scheme
parameter, by parsing the parameter content into name-value pairs.
Backward compatibility is preserved by translating previously supported
values into corresponding new values.
This commit is contained in:
Jim Chen 2018-05-16 00:23:15 -04:00
parent f8b35078fc
commit 1bd537c350
4 changed files with 297 additions and 47 deletions

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@ -121,10 +121,12 @@ enum SSH_ARGS_IDX {
#endif #endif
/** /**
* The name of the color scheme to use. Currently valid color schemes are: * The color scheme to use, as a series of semicolon-separated color-value
* "black-white", "white-black", "gray-black", and "green-black", each * pairs: "background: <color>", "foreground: <color>", or
* following the "foreground-background" pattern. By default, this will be * "color<n>: <color>", where <n> is a number from 0 to 255, and <color> is
* "gray-black". * "color<n>" or an X11 color code (e.g. "aqua" or "rgb:12/34/56").
* The color scheme can also be one of the special values: "black-white",
* "white-black", "gray-black", or "green-black".
*/ */
IDX_COLOR_SCHEME, IDX_COLOR_SCHEME,

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@ -99,10 +99,12 @@ enum TELNET_ARGS_IDX {
IDX_FONT_SIZE, IDX_FONT_SIZE,
/** /**
* The name of the color scheme to use. Currently valid color schemes are: * The color scheme to use, as a series of semicolon-separated color-value
* "black-white", "white-black", "gray-black", and "green-black", each * pairs: "background: <color>", "foreground: <color>", or
* following the "foreground-background" pattern. By default, this will be * "color<n>: <color>", where <n> is a number from 0 to 255, and <color> is
* "gray-black". * "color<n>" or an X11 color code (e.g. "aqua" or "rgb:12/34/56").
* The color scheme can also be one of the special values: "black-white",
* "white-black", "gray-black", or "green-black".
*/ */
IDX_COLOR_SCHEME, IDX_COLOR_SCHEME,

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@ -29,7 +29,9 @@
#include "terminal/terminal_handlers.h" #include "terminal/terminal_handlers.h"
#include "terminal/types.h" #include "terminal/types.h"
#include "terminal/typescript.h" #include "terminal/typescript.h"
#include "terminal/xparsecolor.h"
#include <ctype.h>
#include <errno.h> #include <errno.h>
#include <pthread.h> #include <pthread.h>
#include <stdarg.h> #include <stdarg.h>
@ -255,53 +257,255 @@ void* guac_terminal_thread(void* data) {
} }
/**
* Compare a non-null-terminated string to a null-terminated literal, in the
* same manner as strcmp().
*
* @param str_start
* Start of the non-null-terminated string.
*
* @param str_end
* End of the non-null-terminated string, after the last character.
*
* @param literal
* The null-terminated literal to compare against.
*
* @return
* Zero if the two strings are equal and non-zero otherwise.
*/
static int guac_terminal_color_scheme_compare_token(const char* str_start,
const char* str_end, const char* literal) {
const int result = strncmp(literal, str_start, str_end - str_start);
if (result != 0)
return result;
/* At this point, literal is same length or longer than
* | str_end - str_start |, so if the two are equal, literal should
* have its null-terminator at | str_end - str_start |. */
return (int) (unsigned char) literal[str_end - str_start];
}
/**
* Strip the leading and trailing spaces of a bounded string.
*
* @param[in,out] str_start
* Address of a pointer to the start of the string. On return, the pointer
* is advanced to after any leading spaces.
*
* @param[in,out] str_end
* Address of a pointer to the end of the string, after the last character.
* On return, the pointer is moved back to before any trailing spaces.
*/
static void guac_terminal_color_scheme_strip_spaces(const char** str_start,
const char** str_end) {
/* Strip leading spaces. */
while (*str_start < *str_end && isspace(**str_start))
(*str_start)++;
/* Strip trailing spaces. */
while (*str_end > *str_start && isspace(*(*str_end - 1)))
(*str_end)--;
}
/**
* Parse the name part of the name-value pair within the color-scheme
* configuration.
*
* @param client
* The client that the terminal is connected to.
*
* @param name_start
* Start of the name string.
*
* @param name_end
* End of the name string, after the last character.
*
* @param foreground
* Pointer to the foreground color.
*
* @param background
* Pointer to the background color.
*
* @param palette
* Pointer to the palette array.
*
* @param[out] target
* On return, pointer to the color struct that corresponds to the name.
*
* @return
* Zero if successful or non-zero otherwise.
*/
static int guac_terminal_parse_color_scheme_name(guac_client* client,
const char* name_start, const char* name_end,
guac_terminal_color* foreground, guac_terminal_color* background,
guac_terminal_color (*palette)[256],
guac_terminal_color** target) {
guac_terminal_color_scheme_strip_spaces(&name_start, &name_end);
if (!guac_terminal_color_scheme_compare_token(
name_start, name_end, GUAC_TERMINAL_SCHEME_FOREGROUND)) {
*target = foreground;
return 0;
}
if (!guac_terminal_color_scheme_compare_token(
name_start, name_end, GUAC_TERMINAL_SCHEME_BACKGROUND)) {
*target = background;
return 0;
}
/* Parse color<n> value. */
int index = -1;
if (sscanf(name_start, GUAC_TERMINAL_SCHEME_NUMBERED "%d", &index) &&
index >= 0 && index <= 255) {
*target = &(*palette)[index];
return 0;
}
guac_client_log(client, GUAC_LOG_WARNING,
"Unknown color name: \"%.*s\".",
name_end - name_start, name_start);
return 1;
}
/**
* Parse the value part of the name-value pair within the color-scheme
* configuration.
*
* @param client
* The client that the terminal is connected to.
*
* @param value_start
* Start of the value string.
*
* @param value_end
* End of the value string, after the last character.
*
* @param palette
* The current color palette.
*
* @param[out] target
* On return, the parsed color.
*
* @return
* Zero if successful or non-zero otherwise.
*/
static int guac_terminal_parse_color_scheme_value(guac_client* client,
const char* value_start, const char* value_end,
const guac_terminal_color (*palette)[256],
guac_terminal_color* target) {
guac_terminal_color_scheme_strip_spaces(&value_start, &value_end);
/* Parse color<n> value. */
int index = -1;
if (sscanf(value_start, GUAC_TERMINAL_SCHEME_NUMBERED "%d", &index) &&
index >= 0 && index <= 255) {
*target = (*palette)[index];
return 0;
}
/* Parse X11 value. */
if (!guac_terminal_xparsecolor(value_start, target))
return 0;
guac_client_log(client, GUAC_LOG_WARNING,
"Invalid color value: \"%.*s\".",
value_end - value_start, value_start);
return 1;
}
/**
* Parse a color-scheme configuration string, and return specified
* foreground/background colors and color palette.
*
* @param client
* The client that the terminal is connected to.
*
* @param color_scheme
* A semicolon-separated list of name-value pairs, i.e.
* "<name>: <value> [; <name>: <value> [; ...]]".
* For example, "color2: rgb:cc/33/22; background: color5".
*
* @param[out] foreground
* Parsed foreground color.
*
* @param[out] background
* Parsed background color.
*
* @param[in,out] palette
* Parsed color palette. The caller is responsible for allocating a mutable
* array on entry. On return, the array contains the parsed palette.
*/
static void guac_terminal_parse_color_scheme(guac_client* client,
const char* color_scheme, guac_terminal_color* foreground,
guac_terminal_color* background,
guac_terminal_color (*palette)[256]) {
/* Set default gray-black color scheme and initial palette. */
*foreground = GUAC_TERMINAL_INITIAL_PALETTE[GUAC_TERMINAL_COLOR_GRAY];
*background = GUAC_TERMINAL_INITIAL_PALETTE[GUAC_TERMINAL_COLOR_BLACK];
memcpy(palette, GUAC_TERMINAL_INITIAL_PALETTE,
sizeof(GUAC_TERMINAL_INITIAL_PALETTE));
/* Current char being parsed, or NULL if at end of parsing. */
const char* cursor = color_scheme;
while (cursor) {
/* Start of the current "name: value" pair. */
const char* pair_start = cursor;
/* End of the current name-value pair. */
const char* pair_end = strchr(pair_start, ';');
if (pair_end) {
cursor = pair_end + 1;
}
else {
pair_end = pair_start + strlen(pair_start);
cursor = NULL;
}
guac_terminal_color_scheme_strip_spaces(&pair_start, &pair_end);
if (pair_start >= pair_end)
/* Allow empty pairs, which happens, e.g., when the configuration
* string ends in a semi-colon. */
continue;
/* End of the name part of the pair. */
const char* name_end = memchr(pair_start, ':', pair_end - pair_start);
if (name_end == NULL) {
guac_client_log(client, GUAC_LOG_WARNING,
"Expecting colon: \"%.*s\".",
pair_end - pair_start, pair_start);
return;
}
/* The color that the name corresponds to. */
guac_terminal_color* color_target = NULL;
if (guac_terminal_parse_color_scheme_name(
client, pair_start, name_end, foreground, background,
palette, &color_target))
return; /* Parsing failed. */
if (guac_terminal_parse_color_scheme_value(
client, name_end + 1, pair_end, palette, color_target))
return; /* Parsing failed. */
}
}
guac_terminal* guac_terminal_create(guac_client* client, guac_terminal* guac_terminal_create(guac_client* client,
const char* font_name, int font_size, int dpi, const char* font_name, int font_size, int dpi,
int width, int height, const char* color_scheme, int width, int height, const char* color_scheme,
const int backspace) { const int backspace) {
int default_foreground;
int default_background;
/* Default to "gray-black" color scheme if no scheme provided */
if (color_scheme == NULL || color_scheme[0] == '\0') {
default_foreground = GUAC_TERMINAL_COLOR_GRAY;
default_background = GUAC_TERMINAL_COLOR_BLACK;
}
/* Otherwise, parse color scheme */
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GRAY_BLACK) == 0) {
default_foreground = GUAC_TERMINAL_COLOR_GRAY;
default_background = GUAC_TERMINAL_COLOR_BLACK;
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_BLACK_WHITE) == 0) {
default_foreground = GUAC_TERMINAL_COLOR_BLACK;
default_background = GUAC_TERMINAL_COLOR_WHITE;
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GREEN_BLACK) == 0) {
default_foreground = GUAC_TERMINAL_COLOR_DARK_GREEN;
default_background = GUAC_TERMINAL_COLOR_BLACK;
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_WHITE_BLACK) == 0) {
default_foreground = GUAC_TERMINAL_COLOR_WHITE;
default_background = GUAC_TERMINAL_COLOR_BLACK;
}
/* If invalid, default to "gray-black" */
else {
guac_client_log(client, GUAC_LOG_WARNING,
"Invalid color scheme: \"%s\". Defaulting to \"gray-black\".",
color_scheme);
default_foreground = GUAC_TERMINAL_COLOR_GRAY;
default_background = GUAC_TERMINAL_COLOR_BLACK;
}
/* Build default character using default colors */ /* Build default character using default colors */
guac_terminal_char default_char = { guac_terminal_char default_char = {
.value = 0, .value = 0,
.attributes = { .attributes = {
.foreground = GUAC_TERMINAL_INITIAL_PALETTE[default_foreground],
.background = GUAC_TERMINAL_INITIAL_PALETTE[default_background],
.bold = false, .bold = false,
.half_bright = false, .half_bright = false,
.reverse = false, .reverse = false,
@ -310,6 +514,32 @@ guac_terminal* guac_terminal_create(guac_client* client,
.width = 1 .width = 1
}; };
/* Initialized by guac_terminal_parse_color_scheme. */
guac_terminal_color (*default_palette)[256] = (guac_terminal_color(*)[256])
malloc(sizeof(guac_terminal_color[256]));
/* Special cases. */
if (color_scheme == NULL || color_scheme[0] == '\0') {
/* guac_terminal_parse_color_scheme defaults to gray-black */
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GRAY_BLACK) == 0) {
color_scheme = "foreground:color7;background:color0";
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_BLACK_WHITE) == 0) {
color_scheme = "foreground:color0;background:color15";
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_GREEN_BLACK) == 0) {
color_scheme = "foreground:color2;background:color0";
}
else if (strcmp(color_scheme, GUAC_TERMINAL_SCHEME_WHITE_BLACK) == 0) {
color_scheme = "foreground:color15;background:color0";
}
guac_terminal_parse_color_scheme(client, color_scheme,
&default_char.attributes.foreground,
&default_char.attributes.background,
default_palette);
/* Calculate available display area */ /* Calculate available display area */
int available_width = width - GUAC_TERMINAL_SCROLLBAR_WIDTH; int available_width = width - GUAC_TERMINAL_SCROLLBAR_WIDTH;
if (available_width < 0) if (available_width < 0)
@ -332,7 +562,8 @@ guac_terminal* guac_terminal_create(guac_client* client,
term->display = guac_terminal_display_alloc(client, term->display = guac_terminal_display_alloc(client,
font_name, font_size, dpi, font_name, font_size, dpi,
&default_char.attributes.foreground, &default_char.attributes.foreground,
&default_char.attributes.background, NULL); &default_char.attributes.background,
default_palette);
/* Fail if display init failed */ /* Fail if display init failed */
if (term->display == NULL) { if (term->display == NULL) {

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@ -83,6 +83,21 @@
*/ */
#define GUAC_TERMINAL_SCHEME_WHITE_BLACK "white-black" #define GUAC_TERMINAL_SCHEME_WHITE_BLACK "white-black"
/**
* Color name representing the foreground color.
*/
#define GUAC_TERMINAL_SCHEME_FOREGROUND "foreground"
/**
* Color name representing the background color.
*/
#define GUAC_TERMINAL_SCHEME_BACKGROUND "background"
/**
* Color name representing a numbered color.
*/
#define GUAC_TERMINAL_SCHEME_NUMBERED "color"
typedef struct guac_terminal guac_terminal; typedef struct guac_terminal guac_terminal;
/** /**