table_display takes a list of lists of strings (representing the table cells) and displays them formatted as a table. The exact format depends on the longest string in each column.
Signed-off-by: Jakob Gruber <[email protected]> --- src/pacman/util.c | 110 +++++++++++++++++++++++++++++++++++++++++++++++++++++ src/pacman/util.h | 1 + 2 files changed, 111 insertions(+), 0 deletions(-) diff --git a/src/pacman/util.c b/src/pacman/util.c index ba64a77..65656ff 100644 --- a/src/pacman/util.c +++ b/src/pacman/util.c @@ -435,6 +435,116 @@ void string_display(const char *title, const char *string) printf("\n"); } +static void table_print_line(const alpm_list_t *line, + const alpm_list_t *formats) +{ + const alpm_list_t *curformat = formats; + const alpm_list_t *curcell = line; + + while(curcell && curformat) { + printf(alpm_list_getdata(curformat), alpm_list_getdata(curcell)); + curcell = alpm_list_next(curcell); + curformat = alpm_list_next(curformat); + } + + printf("\n"); +} + +/* creates format strings by checking max cell lengths in cols */ +static alpm_list_t *table_create_format(const alpm_list_t *header, + const alpm_list_t *rows) +{ + alpm_list_t *longest_str, *longest_strs = NULL; + alpm_list_t *formats = NULL; + const alpm_list_t *i, *row, *cell; + char *str, *formatstr; + const int padding = 2; + int colwidth, totalwidth = 0; + int curcol = 0; + + /* header determines column count and initial values of longest_strs */ + for(i = header; i; i = alpm_list_next(i)) { + longest_strs = alpm_list_add(longest_strs, alpm_list_getdata(i)); + } + + /* now find the longest string in each column */ + for(longest_str = longest_strs; longest_str; + longest_str = alpm_list_next(longest_str), curcol++) { + for(i = rows; i; i = alpm_list_next(i)) { + row = alpm_list_getdata(i); + cell = alpm_list_nth(row, curcol); + str = alpm_list_getdata(cell); + + if(strlen(str) > strlen(alpm_list_getdata(longest_str))) { + longest_str->data = str; + } + } + } + + /* now use the column width info to generate format strings */ + for(i = longest_strs; i; i = alpm_list_next(i)) { + colwidth = strlen(alpm_list_getdata(i)) + padding; + totalwidth += colwidth; + + /* right align the last column for a cleaner table display */ + str = (alpm_list_next(i) != NULL) ? "%%-%ds" : "%%%ds"; + pm_asprintf(&formatstr, str, colwidth); + + formats = alpm_list_add(formats, formatstr); + } + + alpm_list_free(longest_strs); + + /* return NULL if terminal is not wide enough */ + if(totalwidth > getcols()) { + fprintf(stderr, _("insufficient columns available for table display\n")); + FREELIST(formats); + return(NULL); + } + + return(formats); +} + +/** Displays the list in table format + * + * @param title the tables title + * @param header the column headers. column count is determined by the nr + * of headers + * @param rows the rows to display as a list of lists of strings. the outer + * list represents the rows, the inner list the cells (= columns) + * + * @return -1 if not enough terminal cols available, else 0 + */ +int table_display(const char *title, const alpm_list_t *header, + const alpm_list_t *rows) +{ + const alpm_list_t *i; + alpm_list_t *formats; + + if(rows == NULL || header == NULL) { + return(0); + } + + formats = table_create_format(header, rows); + if(formats == NULL) { + return(-1); + } + + if(title != NULL) { + printf("%s\n\n", title); + } + + table_print_line(header, formats); + printf("\n"); + + for(i = rows; i; i = alpm_list_next(i)) { + table_print_line(alpm_list_getdata(i), formats); + } + + FREELIST(formats); + return(0); +} + void list_display(const char *title, const alpm_list_t *list) { const alpm_list_t *i; diff --git a/src/pacman/util.h b/src/pacman/util.h index 6a20ba4..d8ae7d8 100644 --- a/src/pacman/util.h +++ b/src/pacman/util.h @@ -53,6 +53,7 @@ char *strreplace(const char *str, const char *needle, const char *replace); alpm_list_t *strsplit(const char *str, const char splitchar); void string_display(const char *title, const char *string); double humanize_size(off_t bytes, const char target_unit, int long_labels, const char **label); +int table_display(const char *title, const alpm_list_t *header, const alpm_list_t *rows); void list_display(const char *title, const alpm_list_t *list); void list_display_linebreak(const char *title, const alpm_list_t *list); void display_targets(const alpm_list_t *pkgs, int install); -- 1.7.4.1
