[PATCH] Add semver coloring

[Morgan Adamiec]

On 07/01/2022 19:57, David Gustavsson wrote:
> When both 'verbose' and 'color' is set, the (dot-separated) parts of the
> version strings where a change has occured will be highlighted in bold
> face -- if there are two or more levels.
> 
> Signed-off-by: David Gustavsson <david.e.gustavsson at gmail.com>
> ---
>  src/pacman/conf.c |  2 ++
>  src/pacman/conf.h |  1 +
>  src/pacman/util.c | 64 ++++++++++++++++++++++++++++++++++++++++++-----
>  src/pacman/util.h |  1 +
>  4 files changed, 62 insertions(+), 6 deletions(-)
> 
> diff --git a/src/pacman/conf.c b/src/pacman/conf.c
> index f9edf75b..707bd421 100644
> --- a/src/pacman/conf.c
> +++ b/src/pacman/conf.c
> @@ -80,6 +80,7 @@ void enable_colors(int colors)
>  		colstr->err     = BOLDRED;
>  		colstr->faint   = GREY46;
>  		colstr->nocolor = NOCOLOR;
> +		colstr->changed = BOLD;
>  	} else {
>  		colstr->colon   = ":: ";
>  		colstr->title   = "";
> @@ -91,6 +92,7 @@ void enable_colors(int colors)
>  		colstr->err     = "";
>  		colstr->faint   = "";
>  		colstr->nocolor = "";
> +		colstr->changed = "";
>  	}
>  }
>  
> diff --git a/src/pacman/conf.h b/src/pacman/conf.h
> index f7916ca9..82a958a9 100644
> --- a/src/pacman/conf.h
> +++ b/src/pacman/conf.h
> @@ -33,6 +33,7 @@ typedef struct __colstr_t {
>  	const char *err;
>  	const char *faint;
>  	const char *nocolor;
> +	const char *changed;
>  } colstr_t;
>  
>  typedef struct __config_repo_t {
> diff --git a/src/pacman/util.c b/src/pacman/util.c
> index c0d62826..e8bfdd09 100644
> --- a/src/pacman/util.c
> +++ b/src/pacman/util.c
> @@ -858,13 +858,52 @@ static alpm_list_t *create_verbose_row(pm_target_t *target)
>  	add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
>  
>  	/* old and new versions */
> -	pm_asprintf(&str, "%s",
> -			target->remove != NULL ? alpm_pkg_get_version(target->remove) : "");
> -	add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +	const char *old_version = target->remove != NULL ? alpm_pkg_get_version(target->remove) : "";
> +	char old_version_copy[strlen(old_version)+1];
> +	strcpy(old_version_copy, (char *)old_version);
> +	const char *new_version = target->install != NULL ? alpm_pkg_get_version(target->install) : "";
> +	char new_version_copy[strlen(new_version)+1];
> +	strcpy(new_version_copy, (char *)new_version);
> +
> +	char *old_semver[10];
> +	char *new_semver[10];
> +	int old_semver_num = semver(old_semver, old_version_copy);
> +	int new_semver_num = semver(new_semver, new_version_copy);
> +
> +	if (old_semver_num > 1 && new_semver_num == old_semver_num) {
> +		char oldstring[100];
> +		char newstring[100];
> +		int oldoffset = 0;
> +		int newoffset = 0;
> +		for (int i = 0; i < old_semver_num; i++) {
> +			if (i>0) {
> +				oldoffset += snprintf(oldstring + oldoffset, 2, ".");
> +				newoffset += snprintf(newstring + newoffset, 2, ".");
> +			}
>  
> -	pm_asprintf(&str, "%s",
> -			target->install != NULL ? alpm_pkg_get_version(target->install) : "");
> -	add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +			if (strcmp(old_semver[i], new_semver[i]) != 0) {
> +				/* This level changed, color in */
> +				oldoffset += sprintf(oldstring + oldoffset, "%s", config->colstr.changed);
> +				newoffset += sprintf(newstring + newoffset, "%s", config->colstr.changed);
> +			}
> +			oldoffset += sprintf(oldstring + oldoffset, "%s", old_semver[i]);
> +			newoffset += sprintf(newstring + newoffset, "%s", new_semver[i]);
> +
> +			oldoffset += sprintf(oldstring + oldoffset, "%s", config->colstr.nocolor);
> +			newoffset += sprintf(newstring + newoffset, "%s", config->colstr.nocolor);
> +		}
> +		pm_asprintf(&str, "%s", oldstring);
> +		add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +		pm_asprintf(&str, "%s", newstring);
> +		add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +	} else {
> +
> +		pm_asprintf(&str, "%s", old_version);
> +		add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +
> +		pm_asprintf(&str, "%s", new_version);
> +		add_table_cell(&ret, str, CELL_NORMAL | CELL_FREE);
> +	}
>  
>  	/* and size */
>  	size -= target->remove ? alpm_pkg_get_isize(target->remove) : 0;
> @@ -1849,3 +1888,16 @@ void console_erase_line(void)
>  {
>  	printf("\x1B[K");
>  }
> +
> +/* Splits version string into semver parts (major.minor.patch). Returns number of found elements. */
> +int semver(char **out, char *version)
> +{
> +	int i = 0;
> +	char *token = strtok(version, ".");
> +	while (token != NULL) {
> +		out[i] = token;
> +		token = strtok(NULL, ".");
> +		i++;
> +	}
> +	return i;
> +}
> diff --git a/src/pacman/util.h b/src/pacman/util.h
> index 52e79915..a119a2f6 100644
> --- a/src/pacman/util.h
> +++ b/src/pacman/util.h
> @@ -88,6 +88,7 @@ void console_cursor_move_down(unsigned int lines);
>  void console_cursor_move_end(void);
>  /* Erases line from the current cursor position till the end of the line */
>  void console_erase_line(void);
> +int semver(char **out, char *version);
>  
>  int pm_printf(alpm_loglevel_t level, const char *format, ...) __attribute__((format(printf,2,3)));
>  int pm_asprintf(char **string, const char *format, ...) __attribute__((format(printf,2,3)));


Package versioning does not follow semver so this patch doesn't really
make sense. However I've implemented version diffing before in a way
that matches how package versions are compared. This is implemented in
both yay and paru so you'll have to adapt the code to c.