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toaruos/lib/rline_exp.c

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/* vim: tabstop=4 shiftwidth=4 noexpandtab
* This file is part of ToaruOS and is released under the terms
* of the NCSA / University of Illinois License - see LICENSE.md
* Copyright (C) 2018 K. Lange
*
* Experimental rline replacement with syntax highlighting, based
* on bim's highlighting and line editing.
*
*/
#define _XOPEN_SOURCE
#define _DEFAULT_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <ctype.h>
#include <termios.h>
#include <string.h>
#include <wchar.h>
#include <unistd.h>
#include <locale.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <toaru/decodeutf8.h>
#include <toaru/rline.h>
#define ENTER_KEY '\n'
#define BACKSPACE_KEY 0x08
#define DELETE_KEY 0x7F
/**
* Same structures as in bim.
* A single character has:
* - A codepoint (Unicode) of up to 21 bits.
* - Flags for syntax highlighting.
* - A display width for rendering.
*/
typedef struct {
uint32_t display_width:4;
uint32_t flags:7;
uint32_t codepoint:21;
} __attribute__((packed)) char_t;
/**
* We generally only have the one line,
* but this matches bim for compatibility reasons.
*/
typedef struct {
int available;
int actual;
int istate;
char_t text[0];
} line_t;
/**
* We operate on a single line of text.
* Maybe we can expand this in the future
* for continuations of edits such as when
* a quote is unclosed?
*/
static line_t * the_line = NULL;
/**
* Line editor state
*/
static int loading = 0;
static int column = 0;
static int offset = 0;
static int width = 0;
static int buf_size_max = 0;
/**
* Prompt strings.
* Defaults to just a "> " prompt with no right side.
* Support for right side prompts is important
* for the ToaruOS shell.
*/
static int prompt_width = 2;
static char * prompt = "> ";
static int prompt_right_width = 0;
static char * prompt_right = "";
int rline_exp_set_prompts(char * left, char * right, int left_width, int right_width) {
prompt = left;
prompt_right = right;
prompt_width = left_width;
prompt_right_width = right_width;
return 0;
}
/**
* Extra shell commands to highlight as keywords.
* These are basically just copied from the
* shell's tab completion database on startup.
*/
static char ** shell_commands = {0};
static int shell_commands_len = 0;
int rline_exp_set_shell_commands(char ** cmds, int len) {
shell_commands = cmds;
shell_commands_len = len;
return 0;
}
/**
* Tab completion callback.
* Compatible with the original rline version.
*/
static rline_callback_t tab_complete_func = NULL;
int rline_exp_set_tab_complete_func(rline_callback_t func) {
tab_complete_func = func;
return 0;
}
static int _unget = -1;
static void _ungetc(int c) {
_unget = c;
}
static int getch(int immediate) {
if (_unget != -1) {
int out = _unget;
_unget = -1;
return out;
}
if (immediate) {
return getc(stdin);
}
struct pollfd fds[1];
fds[0].fd = STDIN_FILENO;
fds[0].events = POLLIN;
int ret = poll(fds,1,10);
if (ret > 0 && fds[0].revents & POLLIN) {
unsigned char buf[1];
read(STDIN_FILENO, buf, 1);
return buf[0];
} else {
return -1;
}
}
/**
* Convert from Unicode string to utf-8.
*/
static int to_eight(uint32_t codepoint, char * out) {
memset(out, 0x00, 7);
if (codepoint < 0x0080) {
out[0] = (char)codepoint;
} else if (codepoint < 0x0800) {
out[0] = 0xC0 | (codepoint >> 6);
out[1] = 0x80 | (codepoint & 0x3F);
} else if (codepoint < 0x10000) {
out[0] = 0xE0 | (codepoint >> 12);
out[1] = 0x80 | ((codepoint >> 6) & 0x3F);
out[2] = 0x80 | (codepoint & 0x3F);
} else if (codepoint < 0x200000) {
out[0] = 0xF0 | (codepoint >> 18);
out[1] = 0x80 | ((codepoint >> 12) & 0x3F);
out[2] = 0x80 | ((codepoint >> 6) & 0x3F);
out[3] = 0x80 | ((codepoint) & 0x3F);
} else if (codepoint < 0x4000000) {
out[0] = 0xF8 | (codepoint >> 24);
out[1] = 0x80 | (codepoint >> 18);
out[2] = 0x80 | ((codepoint >> 12) & 0x3F);
out[3] = 0x80 | ((codepoint >> 6) & 0x3F);
out[4] = 0x80 | ((codepoint) & 0x3F);
} else {
out[0] = 0xF8 | (codepoint >> 30);
out[1] = 0x80 | ((codepoint >> 24) & 0x3F);
out[2] = 0x80 | ((codepoint >> 18) & 0x3F);
out[3] = 0x80 | ((codepoint >> 12) & 0x3F);
out[4] = 0x80 | ((codepoint >> 6) & 0x3F);
out[5] = 0x80 | ((codepoint) & 0x3F);
}
return strlen(out);
}
/**
* Obtain codepoint display width.
*
* This is copied from bim. Supports a few useful
* things like rendering escapes as codepoints.
*/
static int codepoint_width(wchar_t codepoint) {
if (codepoint == '\t') {
return 1; /* Recalculate later */
}
if (codepoint < 32) {
/* We render these as ^@ */
return 2;
}
if (codepoint == 0x7F) {
/* Renders as ^? */
return 2;
}
if (codepoint > 0x7f && codepoint < 0xa0) {
/* Upper control bytes <xx> */
return 4;
}
if (codepoint == 0xa0) {
/* Non-breaking space _ */
return 1;
}
/* Skip wcwidth for anything under 256 */
if (codepoint > 256) {
/* Higher codepoints may be wider (eg. Japanese) */
int out = wcwidth(codepoint);
if (out >= 1) return out;
/* Invalid character, render as [U+ABCD] or [U+ABCDEF] */
return (codepoint < 0x10000) ? 8 : 10;
}
return 1;
}
void recalculate_tabs(line_t * line) {
int j = 0;
for (int i = 0; i < line->actual; ++i) {
if (line->text[i].codepoint == '\t') {
line->text[i].display_width = 4 - (j % 4);
}
j += line->text[i].display_width;
}
}
/**
* Color themes have also been copied from bim.
*
* Slimmed down to only the ones we use for syntax
* highlighting; the UI colors have been removed.
*/
static const char * COLOR_FG = "@9";
static const char * COLOR_BG = "@9";
static const char * COLOR_ALT_FG = "@5";
static const char * COLOR_ALT_BG = "@9";
static const char * COLOR_KEYWORD = "@4";
static const char * COLOR_STRING = "@2";
static const char * COLOR_COMMENT = "@5";
static const char * COLOR_TYPE = "@3";
static const char * COLOR_PRAGMA = "@1";
static const char * COLOR_NUMERAL = "@1";
static const char * COLOR_RED = "@1";
static const char * COLOR_GREEN = "@2";
/**
* Themes are selected from the $RLINE_THEME
* environment variable.
*/
static void rline_exp_load_colorscheme_default(void) {
COLOR_FG = "@9";
COLOR_BG = "@9";
COLOR_ALT_FG = "@10";
COLOR_ALT_BG = "@9";
COLOR_KEYWORD = "@14";
COLOR_STRING = "@2";
COLOR_COMMENT = "@10";
COLOR_TYPE = "@3";
COLOR_PRAGMA = "@1";
COLOR_NUMERAL = "@1";
COLOR_RED = "@1";
COLOR_GREEN = "@2";
}
static void rline_exp_load_colorscheme_sunsmoke(void) {
COLOR_FG = "2;230;230;230";
COLOR_BG = "@9";
COLOR_ALT_FG = "2;122;122;122";
COLOR_ALT_BG = "2;46;43;46";
COLOR_KEYWORD = "2;51;162;230";
COLOR_STRING = "2;72;176;72";
COLOR_COMMENT = "2;158;153;129;3";
COLOR_TYPE = "2;230;206;110";
COLOR_PRAGMA = "2;194;70;54";
COLOR_NUMERAL = "2;230;43;127";
COLOR_RED = "2;222;53;53";
COLOR_GREEN = "2;55;167;0";
}
/**
* Syntax highlighting flags.
*/
#define FLAG_NONE 0
#define FLAG_KEYWORD 1
#define FLAG_STRING 2
#define FLAG_COMMENT 3
#define FLAG_TYPE 4
#define FLAG_PRAGMA 5
#define FLAG_NUMERAL 6
#define FLAG_SELECT 7
#define FLAG_STRING2 8
#define FLAG_DIFFPLUS 9
#define FLAG_DIFFMINUS 10
#define FLAG_CONTINUES (1 << 6)
/**
* Syntax definition for ToaruOS shell
*/
static char * syn_sh_keywords[] = {
"cd","exit","export","help","history","if",
"empty?","equals?","return","export-cmd",
"source","exec","not","while","then","else",
NULL,
};
static int variable_char(uint8_t c) {
if (c >= 'A' && c <= 'Z') return 1;
if (c >= 'a' && c <= 'z') return 1;
if (c >= '0' && c <= '9') return 1;
if (c == '_') return 1;
if (c == '?') return 1;
return 0;
}
static int syn_sh_extended(line_t * line, int i, int c, int last, int * out_left) {
(void)last;
if (c == '#' && last != '\\') {
*out_left = (line->actual + 1) - i;
return FLAG_COMMENT;
}
if (line->text[i].codepoint == '\'' && last != '\\') {
int last = 0;
for (int j = i+1; j < line->actual + 1; ++j) {
int c = line->text[j].codepoint;
if (last != '\\' && c == '\'') {
*out_left = j - i;
return FLAG_STRING;
}
if (last == '\\' && c == '\\') {
last = 0;
}
last = c;
}
*out_left = (line->actual + 1) - i; /* unterminated string */
return FLAG_STRING;
}
if (line->text[i].codepoint == '$' && last != '\\') {
if (i < line->actual - 1 && line->text[i+1].codepoint == '{') {
int j = i + 2;
for (; j < line->actual+1; ++j) {
if (line->text[j].codepoint == '}') break;
}
*out_left = (j - i);
return FLAG_NUMERAL;
}
int j = i + 1;
for (; j < line->actual + 1; ++j) {
if (!variable_char(line->text[j].codepoint)) break;
}
*out_left = (j - i) - 1;
return FLAG_NUMERAL;
}
if (line->text[i].codepoint == '"' && last != '\\') {
int last = 0;
for (int j = i+1; j < line->actual + 1; ++j) {
int c = line->text[j].codepoint;
if (last != '\\' && c == '"') {
*out_left = j - i;
return FLAG_STRING;
}
if (last == '\\' && c == '\\') {
last = 0;
}
last = c;
}
*out_left = (line->actual + 1) - i; /* unterminated string */
return FLAG_STRING;
}
return 0;
}
static int syn_sh_iskeywordchar(int c) {
if (isalnum(c)) return 1;
if (c == '-') return 1;
if (c == '_') return 1;
if (c == '?') return 1;
return 0;
}
static char * syn_py_keywords[] = {
"class","def","return","del","if","else","elif",
"for","while","continue","break","assert",
"as","and","or","except","finally","from",
"global","import","in","is","lambda","with",
"nonlocal","not","pass","raise","try","yield",
NULL
};
static char * syn_py_types[] = {
"True","False","None",
"object","set","dict","int","str","bytes",
NULL
};
int syn_c_iskeywordchar(int c) {
if (isalnum(c)) return 1;
if (c == '_') return 1;
return 0;
}
static int syn_py_extended(line_t * line, int i, int c, int last, int * out_left) {
if (i == 0 && c == 'i') {
/* Check for import */
char * import = "import ";
for (int j = 0; j < line->actual + 1; ++j) {
if (import[j] == '\0') {
*out_left = j - 2;
return FLAG_PRAGMA;
}
if (line->text[j].codepoint != import[j]) break;
}
}
if (c == '#') {
*out_left = (line->actual + 1) - i;
return FLAG_COMMENT;
}
if (c == '@') {
for (int j = i+1; j < line->actual + 1; ++j) {
if (!syn_c_iskeywordchar(line->text[j].codepoint)) {
*out_left = j - i - 1;
return FLAG_PRAGMA;
}
*out_left = (line->actual + 1) - i;
return FLAG_PRAGMA;
}
}
if ((!last || !syn_c_iskeywordchar(last)) && isdigit(c)) {
if (c == '0' && i < line->actual - 1 && line->text[i+1].codepoint == 'x') {
int j = 2;
for (; i + j < line->actual && isxdigit(line->text[i+j].codepoint); ++j);
if (i + j < line->actual && syn_c_iskeywordchar(line->text[i+j].codepoint)) {
return FLAG_NONE;
}
*out_left = j - 1;
return FLAG_NUMERAL;
} else {
int j = 1;
while (i + j < line->actual && isdigit(line->text[i+j].codepoint)) {
j++;
}
if (i + j < line->actual && syn_c_iskeywordchar(line->text[i+j].codepoint)) {
return FLAG_NONE;
}
*out_left = j - 1;
return FLAG_NUMERAL;
}
}
if (line->text[i].codepoint == '\'') {
if (i + 2 < line->actual && line->text[i+1].codepoint == '\'' && line->text[i+2].codepoint == '\'') {
/* Begin multiline */
for (int j = i + 3; j < line->actual - 2; ++j) {
if (line->text[j].codepoint == '\'' &&
line->text[j+1].codepoint == '\'' &&
line->text[j+2].codepoint == '\'') {
*out_left = (j+2) - i;
return FLAG_STRING;
}
}
return FLAG_STRING | FLAG_CONTINUES;
}
int last = 0;
for (int j = i+1; j < line->actual; ++j) {
int c = line->text[j].codepoint;
if (last != '\\' && c == '\'') {
*out_left = j - i;
return FLAG_STRING;
}
if (last == '\\' && c == '\\') {
last = 0;
}
last = c;
}
*out_left = (line->actual + 1) - i; /* unterminated string */
return FLAG_STRING;
}
if (line->text[i].codepoint == '"') {
if (i + 2 < line->actual && line->text[i+1].codepoint == '"' && line->text[i+2].codepoint == '"') {
/* Begin multiline */
for (int j = i + 3; j < line->actual - 2; ++j) {
if (line->text[j].codepoint == '"' &&
line->text[j+1].codepoint == '"' &&
line->text[j+2].codepoint == '"') {
*out_left = (j+2) - i;
return FLAG_STRING;
}
}
return FLAG_STRING2 | FLAG_CONTINUES;
}
int last = 0;
for (int j = i+1; j < line->actual; ++j) {
int c = line->text[j].codepoint;
if (last != '\\' && c == '"') {
*out_left = j - i;
return FLAG_STRING;
}
if (last == '\\' && c == '\\') {
last = 0;
}
last = c;
}
*out_left = (line->actual + 1) - i; /* unterminated string */
return FLAG_STRING;
}
return 0;
}
static int syn_py_finish(line_t * line, int * left, int state) {
/* TODO support multiline quotes */
if (state == (FLAG_STRING | FLAG_CONTINUES)) {
for (int j = 0; j < line->actual - 2; ++j) {
if (line->text[j].codepoint == '\'' &&
line->text[j+1].codepoint == '\'' &&
line->text[j+2].codepoint == '\'') {
*left = (j+3);
return FLAG_STRING;
}
}
return FLAG_STRING | FLAG_CONTINUES;
}
if (state == (FLAG_STRING2 | FLAG_CONTINUES)) {
for (int j = 0; j < line->actual - 2; ++j) {
if (line->text[j].codepoint == '"' &&
line->text[j+1].codepoint == '"' &&
line->text[j+2].codepoint == '"') {
*left = (j+3);
return FLAG_STRING2;
}
}
return FLAG_STRING2 | FLAG_CONTINUES;
}
return 0;
}
/**
* Convert syntax hilighting flag to color code
*/
static const char * flag_to_color(int _flag) {
int flag = _flag & 0x3F;
switch (flag) {
case FLAG_KEYWORD:
return COLOR_KEYWORD;
case FLAG_STRING:
case FLAG_STRING2: /* allows python to differentiate " and ' */
return COLOR_STRING;
case FLAG_COMMENT:
return COLOR_COMMENT;
case FLAG_TYPE:
return COLOR_TYPE;
case FLAG_NUMERAL:
return COLOR_NUMERAL;
case FLAG_PRAGMA:
return COLOR_PRAGMA;
case FLAG_DIFFPLUS:
return COLOR_GREEN;
case FLAG_DIFFMINUS:
return COLOR_RED;
case FLAG_SELECT:
return COLOR_FG;
default:
return COLOR_FG;
}
}
static struct syntax_definition {
char * name;
char ** keywords;
char ** types;
int (*extended)(line_t *, int, int, int, int *);
int (*iskwchar)(int);
int (*finishml)(line_t *, int *, int); /* TODO: How do we use this here? */
} syntaxes[] = {
{"python",syn_py_keywords,syn_py_types,syn_py_extended,syn_c_iskeywordchar,syn_py_finish},
{"esh",syn_sh_keywords,NULL,syn_sh_extended,syn_sh_iskeywordchar,NULL},
{NULL}
};
static struct syntax_definition * syntax;
int rline_exp_set_syntax(char * name) {
for (struct syntax_definition * s = syntaxes; s->name; ++s) {
if (!strcmp(name,s->name)) {
syntax = s;
return 0;
}
}
return 1;
}
/**
* Compare a line against a list of keywords
*/
static int check_line(line_t * line, int c, char * str, int last) {
if (syntax->iskwchar(last)) return 0;
for (int i = c; i < line->actual; ++i, ++str) {
if (*str == '\0' && !syntax->iskwchar(line->text[i].codepoint)) return 1;
if (line->text[i].codepoint == *str) continue;
return 0;
}
if (*str == '\0') return 1;
return 0;
}
/**
* Syntax highlighting
* Slimmed down from the bim implementation a bit,
* but generally compatible with the same definitions.
*
* Type highlighting has been removed as the sh highlighter
* didn't use it. This should be made pluggable again, and
* the bim syntax highlighters should probably be broken
* out into dynamically-loaded libraries?
*/
static void recalculate_syntax(line_t * line) {
if (!syntax) return;
/* Start from the line's stored in initial state */
int state = line->istate;
int left = 0;
int last = 0;
for (int i = 0; i < line->actual; last = line->text[i++].codepoint) {
if (!left) state = 0;
if (state) {
/* Currently hilighting, have `left` characters remaining with this state */
left--;
line->text[i].flags = state;
if (!left) {
/* Done hilighting this state, go back to parsing on next character */
state = 0;
}
/* If we are hilighting something, don't parse */
continue;
}
int c = line->text[i].codepoint;
line->text[i].flags = FLAG_NONE;
/* Language-specific syntax hilighting */
int s = syntax->extended(line,i,c,last,&left);
if (s) {
state = s;
goto _continue;
}
/* Keywords */
if (syntax->keywords) {
for (char ** kw = syntax->keywords; *kw; kw++) {
int c = check_line(line, i, *kw, last);
if (c == 1) {
left = strlen(*kw)-1;
state = FLAG_KEYWORD;
goto _continue;
}
}
}
for (int s = 0; s < shell_commands_len; ++s) {
int c = check_line(line, i, shell_commands[s], last);
if (c == 1) {
left = strlen(shell_commands[s])-1;
state = FLAG_KEYWORD;
goto _continue;
}
}
if (syntax->types) {
for (char ** kw = syntax->types; *kw; kw++) {
int c = check_line(line, i, *kw, last);
if (c == 1) {
left = strlen(*kw)-1;
state = FLAG_TYPE;
goto _continue;
}
}
}
_continue:
line->text[i].flags = state;
}
state = 0;
}
/**
* Set colors
*/
static void set_colors(const char * fg, const char * bg) {
printf("\033[22;23;");
if (*bg == '@') {
int _bg = atoi(bg+1);
if (_bg < 10) {
printf("4%d;", _bg);
} else {
printf("10%d;", _bg-10);
}
} else {
printf("48;%s;", bg);
}
if (*fg == '@') {
int _fg = atoi(fg+1);
if (_fg < 10) {
printf("3%dm", _fg);
} else {
printf("9%dm", _fg-10);
}
} else {
printf("38;%sm", fg);
}
fflush(stdout);
}
/**
* Set just the foreground color
*
* (See set_colors above)
*/
static void set_fg_color(const char * fg) {
printf("\033[22;23;");
if (*fg == '@') {
int _fg = atoi(fg+1);
if (_fg < 10) {
printf("3%dm", _fg);
} else {
printf("9%dm", _fg-10);
}
} else {
printf("38;%sm", fg);
}
fflush(stdout);
}
/**
* Mostly copied from bim, but with some minor
* alterations and removal of selection support.
*/
static void render_line(void) {
printf("\033[?25l");
printf("\033[0m\r%s", prompt);
int i = 0; /* Offset in char_t line data entries */
int j = 0; /* Offset in terminal cells */
const char * last_color = NULL;
/* Set default text colors */
set_colors(COLOR_FG, COLOR_BG);
/*
* When we are rendering in the middle of a wide character,
* we render -'s to fill the remaining amount of the
* charater's width
*/
int remainder = 0;
line_t * line = the_line;
/* For each character in the line ... */
while (i < line->actual) {
/* If there is remaining text... */
if (remainder) {
/* If we should be drawing by now... */
if (j >= offset) {
/* Fill remainder with -'s */
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("-");
set_colors(COLOR_FG, COLOR_BG);
}
/* One less remaining width cell to fill */
remainder--;
/* Terminal offset moves forward */
j++;
/*
* If this was the last remaining character, move to
* the next codepoint in the line
*/
if (remainder == 0) {
i++;
}
continue;
}
/* Get the next character to draw */
char_t c = line->text[i];
/* If we should be drawing by now... */
if (j >= offset) {
/* If this character is going to fall off the edge of the screen... */
if (j - offset + c.display_width >= width - prompt_width) {
/* We draw this with special colors so it isn't ambiguous */
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
/* If it's wide, draw ---> as needed */
while (j - offset < width - prompt_width - 1) {
printf("-");
j++;
}
/* End the line with a > to show it overflows */
printf(">");
set_colors(COLOR_FG, COLOR_BG);
j++;
break;
}
/* Syntax hilighting */
const char * color = flag_to_color(c.flags);
if (!last_color || strcmp(color, last_color)) {
set_fg_color(color);
last_color = color;
}
/* Render special characters */
if (c.codepoint == '\t') {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("»");
for (int i = 1; i < c.display_width; ++i) {
printf("·");
}
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.codepoint < 32) {
/* Codepoints under 32 to get converted to ^@ escapes */
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("^%c", '@' + c.codepoint);
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.codepoint == 0x7f) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("^?");
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.codepoint > 0x7f && c.codepoint < 0xa0) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("<%2x>", c.codepoint);
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.codepoint == 0xa0) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("_");
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.display_width == 8) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("[U+%04x]", c.codepoint);
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.display_width == 10) {
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("[U+%06x]", c.codepoint);
set_colors(last_color ? last_color : COLOR_FG, COLOR_BG);
} else if (c.codepoint == ' ' && i == line->actual - 1) {
/* Special case: space at end of line */
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("·");
set_colors(COLOR_FG, COLOR_BG);
} else {
/* Normal characters get output */
char tmp[7]; /* Max six bytes, use 7 to ensure last is always nil */
to_eight(c.codepoint, tmp);
printf("%s", tmp);
}
/* Advance the terminal cell offset by the render width of this character */
j += c.display_width;
/* Advance to the next character */
i++;
} else if (c.display_width > 1) {
/*
* If this is a wide character but we aren't ready to render yet,
* we may need to draw some filler text for the remainder of its
* width to ensure we don't jump around when horizontally scrolling
* past wide characters.
*/
remainder = c.display_width - 1;
j++;
} else {
/* Regular character, not ready to draw, advance without doing anything */
j++;
i++;
}
}
/* Fill to end right hand side */
for (; j < width + offset - prompt_width; ++j) {
printf(" ");
}
/* Print right hand side */
printf("\033[0m%s", prompt_right);
}
/**
* Create a line_t
*/
static line_t * line_create(void) {
line_t * line = malloc(sizeof(line_t) + sizeof(char_t) * 32);
line->available = 32;
line->actual = 0;
line->istate = 0;
return line;
}
/**
* Insert a character into a line
*/
static line_t * line_insert(line_t * line, char_t c, int offset) {
/* If there is not enough space... */
if (line->actual == line->available) {
/* Expand the line buffer */
line->available *= 2;
line = realloc(line, sizeof(line_t) + sizeof(char_t) * line->available);
}
/* If this was not the last character, then shift remaining characters forward. */
if (offset < line->actual) {
memmove(&line->text[offset+1], &line->text[offset], sizeof(char_t) * (line->actual - offset));
}
/* Insert the new character */
line->text[offset] = c;
/* There is one new character in the line */
line->actual += 1;
if (!loading) {
recalculate_tabs(line);
recalculate_syntax(line);
}
return line;
}
/**
* Update terminal size
*
* We don't listen for sigwinch for various reasons...
*/
static void get_size(void) {
struct winsize w;
ioctl(STDOUT_FILENO, TIOCGWINSZ, &w);
width = w.ws_col - prompt_right_width;
}
/**
* Place the cursor within the line
*/
static void place_cursor_actual(void) {
int x = prompt_width + 1 - offset;
for (int i = 0; i < column; ++i) {
char_t * c = &the_line->text[i];
x += c->display_width;
}
if (x > width - 1) {
/* Adjust the offset appropriately to scroll horizontally */
int diff = x - (width - 1);
offset += diff;
x -= diff;
render_line();
}
/* Same for scrolling horizontally to the left */
if (x < prompt_width + 1) {
int diff = (prompt_width + 1) - x;
offset -= diff;
x += diff;
render_line();
}
printf("\033[?25h\033[%dG", x);
fflush(stdout);
}
/**
* Delete a character
*/
static void line_delete(line_t * line, int offset) {
/* Can't delete character before start of line. */
if (offset == 0) return;
/* If this isn't the last character, we need to move all subsequent characters backwards */
if (offset < line->actual) {
memmove(&line->text[offset-1], &line->text[offset], sizeof(char_t) * (line->actual - offset));
}
/* The line is one character shorter */
line->actual -= 1;
if (!loading) {
recalculate_tabs(line);
recalculate_syntax(line);
}
}
/**
* Backspace from the cursor position
*/
static void delete_at_cursor(void) {
if (column > 0) {
line_delete(the_line, column);
column--;
if (offset > 0) offset--;
}
}
/**
* Delete whole word
*/
static void delete_word(void) {
if (!the_line->actual) return;
if (!column) return;
do {
if (column > 0) {
line_delete(the_line, column);
column--;
if (offset > 0) offset--;
}
} while (column && the_line->text[column-1].codepoint != ' ');
}
/**
* Insert at cursor position
*/
static void insert_char(uint32_t c) {
char_t _c;
_c.codepoint = c;
_c.flags = 0;
_c.display_width = codepoint_width(c);
the_line = line_insert(the_line, _c, column);
column++;
}
/**
* Move cursor left
*/
static void cursor_left(void) {
if (column > 0) column--;
place_cursor_actual();
}
/**
* Move cursor right
*/
static void cursor_right(void) {
if (column < the_line->actual) column++;
place_cursor_actual();
}
/**
* Move cursor one whole word left
*/
static void word_left(void) {
if (column == 0) return;
column--;
while (column && the_line->text[column].codepoint == ' ') {
column--;
}
while (column > 0) {
if (the_line->text[column-1].codepoint == ' ') break;
column--;
}
place_cursor_actual();
}
/**
* Move cursor one whole word right
*/
static void word_right(void) {
while (column < the_line->actual && the_line->text[column].codepoint == ' ') {
column++;
}
while (column < the_line->actual) {
column++;
if (the_line->text[column].codepoint == ' ') break;
}
place_cursor_actual();
}
/**
* Move cursor to start of line
*/
static void cursor_home(void) {
column = 0;
place_cursor_actual();
}
/*
* Move cursor to end of line
*/
static void cursor_end(void) {
column = the_line->actual;
place_cursor_actual();
}
/**
* Temporary buffer for holding utf-8 data
*/
static char temp_buffer[1024];
/**
* Cycle to previous history entry
*/
static void history_previous(void) {
if (rline_scroll == 0) {
/* Convert to temporaary buffer */
unsigned int off = 0;
memset(temp_buffer, 0, sizeof(temp_buffer));
for (int j = 0; j < the_line->actual; j++) {
char_t c = the_line->text[j];
off += to_eight(c.codepoint, &temp_buffer[off]);
}
}
if (rline_scroll < rline_history_count) {
rline_scroll++;
/* Copy in from history */
the_line->actual = 0;
column = 0;
loading = 1;
char * buf = rline_history_prev(rline_scroll);
uint32_t istate = 0, c = 0;
for (unsigned int i = 0; i < strlen(buf); ++i) {
if (!decode(&istate, &c, buf[i])) {
insert_char(c);
}
}
loading = 0;
}
/* Set cursor at end */
column = the_line->actual;
offset = 0;
recalculate_tabs(the_line);
recalculate_syntax(the_line);
render_line();
place_cursor_actual();
}
/**
* Cycle to next history entry
*/
static void history_next(void) {
if (rline_scroll > 1) {
rline_scroll--;
/* Copy in from history */
the_line->actual = 0;
column = 0;
loading = 1;
char * buf = rline_history_prev(rline_scroll);
uint32_t istate = 0, c = 0;
for (unsigned int i = 0; i < strlen(buf); ++i) {
if (!decode(&istate, &c, buf[i])) {
insert_char(c);
}
}
loading = 0;
} else if (rline_scroll == 1) {
/* Copy in from temp */
rline_scroll = 0;
the_line->actual = 0;
column = 0;
loading = 1;
char * buf = temp_buffer;
uint32_t istate = 0, c = 0;
for (unsigned int i = 0; i < strlen(buf); ++i) {
if (!decode(&istate, &c, buf[i])) {
insert_char(c);
}
}
loading = 0;
}
/* Set cursor at end */
column = the_line->actual;
offset = 0;
recalculate_tabs(the_line);
recalculate_syntax(the_line);
render_line();
place_cursor_actual();
}
/**
* Handle escape sequences (arrow keys, etc.)
*/
static int handle_escape(int * this_buf, int * timeout, int c) {
if (*timeout >= 1 && this_buf[*timeout-1] == '\033' && c == '\033') {
this_buf[*timeout] = c;
(*timeout)++;
return 1;
}
if (*timeout >= 1 && this_buf[*timeout-1] == '\033' && c != '[') {
*timeout = 0;
_ungetc(c);
return 1;
}
if (*timeout >= 1 && this_buf[*timeout-1] == '\033' && c == '[') {
*timeout = 1;
this_buf[*timeout] = c;
(*timeout)++;
return 0;
}
if (*timeout >= 2 && this_buf[0] == '\033' && this_buf[1] == '[' &&
(isdigit(c) || c == ';')) {
this_buf[*timeout] = c;
(*timeout)++;
return 0;
}
if (*timeout >= 2 && this_buf[0] == '\033' && this_buf[1] == '[') {
switch (c) {
case 'A': // up
history_previous();
break;
case 'B': // down
history_next();
break;
case 'C': // right
if (this_buf[*timeout-1] == '5') {
word_right();
} else {
cursor_right();
}
break;
case 'D': // left
if (this_buf[*timeout-1] == '5') {
word_left();
} else {
cursor_left();
}
break;
case 'H': // home
cursor_home();
break;
case 'F': // end
cursor_end();
break;
case '~':
switch (this_buf[*timeout-1]) {
case '1':
cursor_home();
break;
case '3':
/* Delete forward */
if (column < the_line->actual) {
line_delete(the_line, column+1);
if (offset > 0) offset--;
}
break;
case '4':
cursor_end();
break;
}
break;
default:
break;
}
*timeout = 0;
return 0;
}
*timeout = 0;
return 0;
}
struct termios old;
static void get_initial_termios(void) {
tcgetattr(STDOUT_FILENO, &old);
}
static void set_unbuffered(void) {
struct termios new = old;
new.c_lflag &= (~ICANON & ~ECHO);
new.c_cc[VINTR] = 0;
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &new);
}
static void set_buffered(void) {
tcsetattr(STDOUT_FILENO, TCSAFLUSH, &old);
}
static int tabbed;
static void dummy_redraw(rline_context_t * context) {
/* Do nothing */
}
/**
* Juggle our buffer with an rline context so we can
* call original rline functions such as a tab-completion callback
* or reverse search.
*/
static void call_rline_func(rline_callback_t func, rline_context_t * context) {
/* Unicode parser state */
uint32_t istate = 0;
uint32_t c;
/* Don't let rline draw things */
context->quiet = 1;
/* Allocate a temporary buffer */
context->buffer = malloc(buf_size_max);
memset(context->buffer,0,buf_size_max);
/* Convert current data to utf-8 */
unsigned int off = 0;
for (int j = 0; j < the_line->actual; j++) {
if (j == column) {
/* Track cursor position */
context->offset = off;
}
char_t c = the_line->text[j];
off += to_eight(c.codepoint, &context->buffer[off]);
}
/* If the cursor was at the end, the loop above didn't catch it */
if (column == the_line->actual) context->offset = off;
/*
* Did we just press tab before this? This is actually managed
* by the tab-completion function.
*/
context->tabbed = tabbed;
/* Empty callbacks */
rline_callbacks_t tmp = {0};
/*
* Because some clients expect this to be set...
* (we don't need it, we'll redraw ourselves later)
*/
tmp.redraw_prompt = dummy_redraw;
/* Setup context */
context->callbacks = &tmp;
context->collected = off;
context->buffer[off] = '\0';
context->requested = 1024;
/* Reset colors (for tab completion candidates, etc. */
printf("\033[0m");
/* Call the function */
func(context);
/* Now convert back */
loading = 1;
int final_column = 0;
the_line->actual = 0;
column = 0;
istate = 0;
for (int i = 0; i < context->collected; ++i) {
if (i == context->offset) {
final_column = column;
}
if (!decode(&istate, &c, context->buffer[i])) {
insert_char(c);
}
}
free(context->buffer);
/* Position cursor */
if (context->offset == context->collected) {
column = the_line->actual;
} else {
column = final_column;
}
tabbed = context->tabbed;
loading = 0;
/* Recalculate + redraw */
recalculate_tabs(the_line);
recalculate_syntax(the_line);
render_line();
place_cursor_actual();
}
/**
* Perform actual interactive line editing.
*
* This is mostly a reimplementation of bim's
* INSERT mode, but with some cleanups and fixes
* to work on a single line and to add some new
* key bindings we don't have in bim.
*/
static int read_line(void) {
int cin;
uint32_t c;
int timeout = 0;
int this_buf[20];
uint32_t istate = 0;
int immediate = 1;
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
fprintf(stdout, "◄\033[0m"); /* TODO: This could be retrieved from an envvar */
for (int i = 0; i < width + prompt_right_width - 1; ++i) {
fprintf(stdout, " ");
}
render_line();
place_cursor_actual();
while ((cin = getch(immediate))) {
if (cin == -1) {
immediate = 1;
render_line();
place_cursor_actual();
continue;
}
get_size();
if (!decode(&istate, &c, cin)) {
if (timeout == 0) {
if (c != '\t') tabbed = 0;
switch (c) {
case '\033':
if (timeout == 0) {
this_buf[timeout] = c;
timeout++;
}
break;
case 3: /* ^C - Cancel editing, and print ^C */
the_line->actual = 0;
set_colors(COLOR_ALT_FG, COLOR_ALT_BG);
printf("^C");
printf("\033[0m");
return 1;
case 4: /* ^D - With a blank line, return nothing */
if (column == 0 && the_line->actual == 0) {
for (char *_c = rline_exit_string; *_c; ++_c) {
insert_char(*_c);
}
render_line();
place_cursor_actual();
return 1;
} else { /* Otherwise act like delete */
if (column < the_line->actual) {
line_delete(the_line, column+1);
if (offset > 0) offset--;
immediate = 0;
}
}
break;
case DELETE_KEY:
case BACKSPACE_KEY:
delete_at_cursor();
immediate = 0;
break;
case ENTER_KEY:
/* Finished */
loading = 1;
column = the_line->actual;
insert_char('\n');
immediate = 0;
return 1;
case 22: /* ^V */
/* Don't bother with unicode, just take the next byte */
insert_char(getc(stdin));
immediate = 0;
break;
case 23: /* ^W */
delete_word();
immediate = 0;
break;
case 12: /* ^L - Repaint the whole screen */
printf("\033[2J\033[H");
render_line();
place_cursor_actual();
break;
case '\t':
if (tab_complete_func) {
/* Tab complete */
rline_context_t context = {0};
call_rline_func(tab_complete_func, &context);
immediate = 0;
} else {
/* Insert tab character */
insert_char('\t');
immediate = 0;
}
break;
case 18:
{
rline_context_t context = {0};
call_rline_func(rline_reverse_search, &context);
if (!context.cancel) {
return 1;
}
immediate = 0;
}
break;
default:
insert_char(c);
immediate = 0;
break;
}
} else {
if (handle_escape(this_buf,&timeout,c)) {
continue;
}
immediate = 0;
}
} else if (istate == UTF8_REJECT) {
istate = 0;
}
}
return 0;
}
/**
* Read a line of text with interactive editing.
*/
int rline_experimental(char * buffer, int buf_size) {
get_initial_termios();
set_unbuffered();
get_size();
column = 0;
offset = 0;
buf_size_max = buf_size;
char * theme = getenv("RLINE_THEME");
if (theme && !strcmp(theme,"sunsmoke")) { /* TODO bring back theme tables */
rline_exp_load_colorscheme_sunsmoke();
} else {
rline_exp_load_colorscheme_default();
}
the_line = line_create();
loading = 0;
read_line();
printf("\033[0m\n");
unsigned int off = 0;
for (int j = 0; j < the_line->actual; j++) {
char_t c = the_line->text[j];
off += to_eight(c.codepoint, &buffer[off]);
}
free(the_line);
set_buffered();
return strlen(buffer);
}
void * rline_exp_for_python(void * _stdin, void * _stdout, char * prompt) {
rline_exp_set_prompts(prompt, "", strlen(prompt), 0);
char * buf = malloc(1024);
memset(buf, 0, 1024);
rline_exp_set_syntax("python");
rline_exit_string = "";
rline_experimental(buf, 1024);
rline_history_insert(strdup(buf));
rline_scroll = 0;
return buf;
}
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