On Wed, Jan 29, 2014 at 07:31:29PM -0500, Tom Lane wrote:
> Bruce Momjian <[email protected]> writes:
> > I have cleaned up entab.c so I am ready to add a new option that removes
> > tabs from only comments. Would you like me to create that and provide a
> > diff at a URL? It would have to be run against all back branches.
>
> If you think you can actually tell the difference reliably in entab,
> sure, give it a go.
OK, I have modified entab.c in a private patch to only process text
inside comments, and not process leading whitespace, patch attached. I
basically ran 'entab -o -t4 -d' on the C files.
The result are here, in context, plain, and unified format:
http://momjian.us/expire/entab_comment.cdiff
http://momjian.us/expire/entab_comment.pdiff
http://momjian.us/expire/entab_comment.udiff
and their line counts:
89741 entab_comment.cdiff
26351 entab_comment.pdiff
50503 entab_comment.udiff
I compute 6627 lines as modified. What I did not do is handle _only_
cases with periods before the tabs. Should I try that?
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
diff --git a/src/tools/entab/entab.c b/src/tools/entab/entab.c
new file mode 100644
index 3b849f2..3fd2997
*** a/src/tools/entab/entab.c
--- b/src/tools/entab/entab.c
*************** main(int argc, char **argv)
*** 51,63 ****
{
int tab_size = 8,
min_spaces = 2,
protect_quotes = FALSE,
del_tabs = FALSE,
clip_lines = FALSE,
prv_spaces,
col_in_tab,
escaped,
! nxt_spaces;
char in_line[BUFSIZ],
out_line[BUFSIZ],
*src,
--- 51,66 ----
{
int tab_size = 8,
min_spaces = 2,
+ only_comments = FALSE,
protect_quotes = FALSE,
del_tabs = FALSE,
clip_lines = FALSE,
+ in_comment = FALSE,
prv_spaces,
col_in_tab,
escaped,
! nxt_spaces,
! leading_whitespace;
char in_line[BUFSIZ],
out_line[BUFSIZ],
*src,
*************** main(int argc, char **argv)
*** 74,80 ****
if (strcmp(cp, "detab") == 0)
del_tabs = 1;
! while ((ch = getopt(argc, argv, "cdhqs:t:")) != -1)
switch (ch)
{
case 'c':
--- 77,83 ----
if (strcmp(cp, "detab") == 0)
del_tabs = 1;
! while ((ch = getopt(argc, argv, "cdhoqs:t:")) != -1)
switch (ch)
{
case 'c':
*************** main(int argc, char **argv)
*** 83,88 ****
--- 86,94 ----
case 'd':
del_tabs = TRUE;
break;
+ case 'o':
+ only_comments = TRUE;
+ break;
case 'q':
protect_quotes = TRUE;
break;
*************** main(int argc, char **argv)
*** 97,102 ****
--- 103,109 ----
fprintf(stderr, "USAGE: %s [ -cdqst ] [file ...]\n\
-c (clip trailing whitespace)\n\
-d (delete tabs)\n\
+ -o (only comments)\n\
-q (protect quotes)\n\
-s minimum_spaces\n\
-t tab_width\n",
*************** main(int argc, char **argv)
*** 134,146 ****
if (escaped == FALSE)
quote_char = ' ';
escaped = FALSE;
/* process line */
while (*src != NUL)
{
col_in_tab++;
/* Is this a potential space/tab replacement? */
! if (quote_char == ' ' && (*src == ' ' || *src == '\t'))
{
if (*src == '\t')
{
--- 141,163 ----
if (escaped == FALSE)
quote_char = ' ';
escaped = FALSE;
+ leading_whitespace = TRUE;
/* process line */
while (*src != NUL)
{
col_in_tab++;
+
+ /* look backward so we handle slash-star-slash properly */
+ if (!in_comment && src > in_line &&
+ *(src - 1) == '/' && *src == '*')
+ in_comment = TRUE;
+ else if (in_comment && *src == '*' && *(src + 1) == '/')
+ in_comment = FALSE;
+
/* Is this a potential space/tab replacement? */
! if ((!only_comments || (in_comment && !leading_whitespace)) &&
! quote_char == ' ' && (*src == ' ' || *src == '\t'))
{
if (*src == '\t')
{
*************** main(int argc, char **argv)
*** 192,197 ****
--- 209,218 ----
/* Not a potential space/tab replacement */
else
{
+ /* allow leading stars in comments */
+ if (leading_whitespace && *src != ' ' && *src != '\t' &&
+ (!in_comment || *src != '*'))
+ leading_whitespace = FALSE;
/* output accumulated spaces */
output_accumulated_spaces(&prv_spaces, &dst);
/* This can only happen in a quote. */
--
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