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Overview
Comment:Enhanced comments in the diff.c source code file. No code changes.
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SHA1: a39a992b4e02a92ff85a1173bfa0ff1d32d47383
User & Date: drh 2012-12-17 14:00:44
Context
2012-12-18
02:38
Fix the display of file renames so that they show up as just renames and do not also appear as a delete. check-in: ebd36f9b user: drh tags: trunk
01:39
When a file is renamed, do not show it has having been deleted in addition to being renamed. After upgrading through this change, you must run "fossil rebuild" for the fix to take effect. check-in: 4ac43fe6 user: drh tags: improved-name-change-display
2012-12-17
14:00
Enhanced comments in the diff.c source code file. No code changes. check-in: a39a992b user: drh tags: trunk
00:38
Change the footer in the 'Enhanced Default' skin to show the approximate time needed to generated the HTML for the page. check-in: 0c6e6451 user: mistachkin tags: trunk
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to src/diff.c.

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#include "config.h"
#include "diff.h"
#include <assert.h>


#if INTERFACE
/*
** Allowed flag parameters to the text_diff() and html_sbsdiff() functions:

*/
#define DIFF_CONTEXT_MASK ((u64)0x0000ffff) /* Lines of context. Default if 0 */
#define DIFF_WIDTH_MASK   ((u64)0x00ff0000) /* side-by-side column width */
#define DIFF_IGNORE_EOLWS ((u64)0x01000000) /* Ignore end-of-line whitespace */
#define DIFF_SIDEBYSIDE   ((u64)0x02000000) /* Generate a side-by-side diff */
#define DIFF_NEWFILE      ((u64)0x04000000) /* Missing shown as empty files */
#define DIFF_BRIEF        ((u64)0x08000000) /* Show filenames only */
................................................................................
#define DIFF_CANNOT_COMPUTE_SYMLINK \
    "cannot compute difference between symlink and regular file\n"

#define looks_like_binary(blob) (looks_like_utf8((blob)) == 0)
#endif /* INTERFACE */

/*
** Maximum length of a line in a text file, in bytes.  (8192)
*/
#define LENGTH_MASK_SZ  13
#define LENGTH_MASK     ((1<<LENGTH_MASK_SZ)-1)

/*
** Information about each line of a file being diffed.
**
................................................................................
**
** Trailing whitespace is removed from each line.  2010-08-20:  Not any
** more.  If trailing whitespace is ignored, the "patch" command gets
** confused by the diff output.  Ticket [a9f7b23c2e376af5b0e5b]
**
** Return 0 if the file is binary or contains a line that is
** too long.



*/
static DLine *break_into_lines(const char *z, int n, int *pnLine, int ignoreWS){
  int nLine, i, j, k, x;
  unsigned int h, h2;
  DLine *a;

  /* Count the number of lines.  Allocate space to hold
................................................................................
    blob_append(pOut, pLine->z, pLine->h & LENGTH_MASK);
  }
  blob_append(pOut, "\n", 1);
}

/*
** Add two line numbers to the beginning of an output line for a context
** diff.  One or of the other of the two numbers might be zero, which means
** to leave that number field blank.  The "html" parameter means to format
** the output for HTML.
*/
static void appendDiffLineno(Blob *pOut, int lnA, int lnB, int html){
  if( html ) blob_append(pOut, "<span class=\"diffln\">", -1);
  if( lnA>0 ){
    blob_appendf(pOut, "%6d ", lnA);
................................................................................
    }
    for(i=1; i<nr; i++){
      na += R[r+i*3];
      nb += R[r+i*3];
    }

    /* Show the header for this block, or if we are doing a modified
    ** context diff that contains line numbers, show the separate from
    ** the previous block.
    */
    nChunk++;
    if( showLn ){
      if( r==0 ){
        /* Do not show a top divider */
      }else if( html ){







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#include "config.h"
#include "diff.h"
#include <assert.h>


#if INTERFACE
/*
** Flag parameters to the text_diff() routine used to control the formatting
** of the diff output.
*/
#define DIFF_CONTEXT_MASK ((u64)0x0000ffff) /* Lines of context. Default if 0 */
#define DIFF_WIDTH_MASK   ((u64)0x00ff0000) /* side-by-side column width */
#define DIFF_IGNORE_EOLWS ((u64)0x01000000) /* Ignore end-of-line whitespace */
#define DIFF_SIDEBYSIDE   ((u64)0x02000000) /* Generate a side-by-side diff */
#define DIFF_NEWFILE      ((u64)0x04000000) /* Missing shown as empty files */
#define DIFF_BRIEF        ((u64)0x08000000) /* Show filenames only */
................................................................................
#define DIFF_CANNOT_COMPUTE_SYMLINK \
    "cannot compute difference between symlink and regular file\n"

#define looks_like_binary(blob) (looks_like_utf8((blob)) == 0)
#endif /* INTERFACE */

/*
** Maximum length of a line in a text file, in bytes.  (2**13 = 8192 bytes)
*/
#define LENGTH_MASK_SZ  13
#define LENGTH_MASK     ((1<<LENGTH_MASK_SZ)-1)

/*
** Information about each line of a file being diffed.
**
................................................................................
**
** Trailing whitespace is removed from each line.  2010-08-20:  Not any
** more.  If trailing whitespace is ignored, the "patch" command gets
** confused by the diff output.  Ticket [a9f7b23c2e376af5b0e5b]
**
** Return 0 if the file is binary or contains a line that is
** too long.
**
** Profiling show that in most cases this routine consumes the bulk of
** the CPU time on a diff.
*/
static DLine *break_into_lines(const char *z, int n, int *pnLine, int ignoreWS){
  int nLine, i, j, k, x;
  unsigned int h, h2;
  DLine *a;

  /* Count the number of lines.  Allocate space to hold
................................................................................
    blob_append(pOut, pLine->z, pLine->h & LENGTH_MASK);
  }
  blob_append(pOut, "\n", 1);
}

/*
** Add two line numbers to the beginning of an output line for a context
** diff.  One or the other of the two numbers might be zero, which means
** to leave that number field blank.  The "html" parameter means to format
** the output for HTML.
*/
static void appendDiffLineno(Blob *pOut, int lnA, int lnB, int html){
  if( html ) blob_append(pOut, "<span class=\"diffln\">", -1);
  if( lnA>0 ){
    blob_appendf(pOut, "%6d ", lnA);
................................................................................
    }
    for(i=1; i<nr; i++){
      na += R[r+i*3];
      nb += R[r+i*3];
    }

    /* Show the header for this block, or if we are doing a modified
    ** context diff that contains line numbers, show the separator from
    ** the previous block.
    */
    nChunk++;
    if( showLn ){
      if( r==0 ){
        /* Do not show a top divider */
      }else if( html ){