/*
** Copyright (c) 2007 D. Richard Hipp
**
** This program is free software; you can redistribute it and/or
** modify it under the terms of the Simplified BSD License (also
** known as the "2-Clause License" or "FreeBSD License".)
** This program is distributed in the hope that it will be useful,
** but without any warranty; without even the implied warranty of
** merchantability or fitness for a particular purpose.
**
** Author contact information:
** drh@hwaci.com
** http://www.hwaci.com/drh/
**
*******************************************************************************
**
** This file contains code used to format and print comments or other
** text on a TTY.
*/
#include "config.h"
#include "comformat.h"
#include <assert.h>
#ifdef _WIN32
# include <windows.h>
#else
# include <termios.h>
#endif
#if INTERFACE
#define COMMENT_PRINT_NONE ((u32)0x00000000) /* No flags. */
#define COMMENT_PRINT_WORD_BREAK ((u32)0x00000001) /* Break lines on words. */
#define COMMENT_PRINT_DEFAULT COMMENT_PRINT_NONE /* Default flags. */
#endif
/*
** This is the previous value used by most external callers when they
** needed to specify a default maximum line length to be used with the
** comment_print() function.
*/
#ifndef COMMENT_LEGACY_LINE_LENGTH
# define COMMENT_LEGACY_LINE_LENGTH (78)
#endif
/*
** This is the number of spaces to print when a tab character is seen.
*/
#ifndef COMMENT_TAB_WIDTH
# define COMMENT_TAB_WIDTH (8)
#endif
/*
** Given a comment string zText, format that string for printing
** on a TTY. Assume that the output cursors is indent spaces from
** the left margin and that a single line can contain no more than
** width characters. Indent all subsequent lines by indent.
**
** Return the number of newlines that are output.
*/
int comment_print(
const char *zText, /* The comment text to be printed. */
int indent, /* Number of spaces to indent each non-initial line. */
int width, /* Maximum number of characters per line. */
int flags /* Zero or more "COMMENT_PRINT_*" flags, see above. */
){
int maxChars = width - indent;
int lineCnt = 0;
const char *zLine;
#if defined(_WIN32)
if( width<0 ){
CONSOLE_SCREEN_BUFFER_INFO csbi;
memset(&csbi, 0, sizeof(CONSOLE_SCREEN_BUFFER_INFO));
if( GetConsoleScreenBufferInfo(GetStdHandle(STD_OUTPUT_HANDLE), &csbi) ){
maxChars = csbi.srWindow.Right - csbi.srWindow.Left - indent;
}
}
#elif defined(TIOCGWINSZ)
if( width<0 ){
struct winsize w;
memset(&w, 0, sizeof(struct winsize));
if( ioctl(0, TIOCGWINSZ, &w)!=-1 ){
maxChars = w.ws_col - indent;
}
}
#else
if( width<0 ){
/*
** Fallback to using more-or-less the "legacy semantics" of hard-coding
** the maximum line length to a value reasonable for the vast majority
** of supported systems.
*/
maxChars = COMMENT_LEGACY_LINE_LENGTH - indent;
}
#endif
if( zText==0 ) zText = "(NULL)";
if( maxChars<=0 ){
maxChars = strlen(zText);
}
while( fossil_isspace(zText[0]) ){ zText++; }
if( zText[0]==0 ){
fossil_print("\n");
lineCnt++;
return lineCnt;
}
zLine = zText;
for(;;){
comment_print_line(zLine, zLine>zText ? indent : 0, maxChars,
flags & COMMENT_PRINT_WORD_BREAK, &lineCnt,
&zLine);
if( !zLine || !zLine[0] ) break;
}
return lineCnt;
}
/*
** This function prints one logical line of a comment, stopping when it hits
** a new line -OR- runs out of space on the logical line.
*/
void comment_print_line(
const char *zLine, /* [in] The comment line to print. */
int indent, /* [in] Number of spaces to indent, zero for none. */
int lineChars, /* [in] Maximum number of characters to print. */
int wordBreak, /* [in] Non-zero to try breaking on word boundaries. */
int *pLineCnt, /* [in/out] Pointer to the total line count. */
const char **pzLine /* [out] Pointer to the end of the logical line. */
){
int index = 0, charCnt = 0, lineCnt = 0, maxChars;
if( !zLine ) return;
if( lineChars<=0 ) return;
comment_print_indent(zLine, indent, &index);
maxChars = lineChars;
for(;;){
char c = zLine[index];
if( c==0 ){
break;
}else{
index++;
}
if( c=='\n' ){
charCnt = 0;
lineCnt++;
}else if( c=='\t' ){
charCnt++;
if( maxChars<COMMENT_TAB_WIDTH ){
fossil_print(" ");
break;
}
maxChars -= COMMENT_TAB_WIDTH;
}else if( wordBreak && fossil_isspace(c) ){
int nextIndex = comment_next_space(zLine, index);
if( nextIndex<=0 || (nextIndex-index)>maxChars ){
break;
}
charCnt++;
maxChars--;
}else{
charCnt++;
maxChars--;
}
fossil_print("%c", c);
if( maxChars==0 ) break;
if( c=='\n' ) break;
}
if( charCnt>0 || lineCnt==0 ){
fossil_print("\n");
lineCnt++;
}
if( pLineCnt ){
*pLineCnt += lineCnt;
}
if( pzLine ){
*pzLine = zLine + index;
}
}
/*
** This function is called when printing a logical comment line to perform
** the necessary indenting.
*/
void comment_print_indent(
const char *zLine, /* [in] The comment line being printed. */
int indent, /* [in] Number of spaces to indent, zero for none. */
int *piIndex /* [in/out] Pointer to first non-space character. */
){
if( indent>0 ){
fossil_print("%*s", indent, "");
if( zLine && piIndex ){
int index = *piIndex;
while( fossil_isspace(zLine[index]) ){ index++; }
*piIndex = index;
}
}
}
/*
** This function scans the specified comment line starting just after the
** initial index and returns the index of the next spacing character -OR-
** zero if such a character cannot be found.
*/
int comment_next_space(
const char *zLine, /* [in] The comment line being printed. */
int index /* [in] The current character index being handled. */
){
int nextIndex = index + 1;
for(;;){
char c = zLine[nextIndex];
if( c==0 ){
return 0;
}
if( fossil_isspace(c) ){
return nextIndex;
}
nextIndex++;
}
return 0; /* NOT REACHED */
}
/*
**
** COMMAND: test-comment-format
**
** Usage: %fossil test-comment-format ?OPTIONS? PREFIX TEXT ?WIDTH?
**
** Test comment formatting and printing. Use for testing only.
**
** Options:
** --decode Decode the text using the same method used when
** handling the value of a C-card from a manifest.
** --wordbreak Attempt to break lines on word boundaries.
*/
void test_comment_format(void){
const char *zPrefix;
char *zText;
int indent, width;
int decode = find_option("decode", 0, 0)!=0;
int flags = COMMENT_PRINT_DEFAULT;
if( find_option("wordbreak", 0, 0) ){
flags |= COMMENT_PRINT_WORD_BREAK;
}
if( g.argc!=4 && g.argc!=5 ){
usage("PREFIX TEXT ?WIDTH?");
}
zPrefix = g.argv[2];
if( decode ){
zText = mprintf("%s", g.argv[3]);
defossilize(zText);
}else{
zText = g.argv[3];
}
indent = strlen(zPrefix);
if( g.argc==5 ){
width = atoi(g.argv[4]);
}else{
width = -1; /* automatic */
}
if( indent>0 ){
fossil_print("%s", zPrefix);
}
fossil_print("(%d lines output)\n",
comment_print(zText, indent, width, flags));
if( zText!=g.argv[3] ) fossil_free(zText);
}