Support dynamic screens with 'top-most' entities beyond processes

This implements our concept of 'dynamic screens' in htop, with a
first use-case of pcp-htop displaying things like top-filesystem
and top-cgroups under new screen tabs.  However the idea is more
general than use in pcp-htop and we've paved the way here for us
to collectively build mroe general tabular screens in core htop,
as well.

From the pcp-htop side of things, dynamic screens are configured
using text-based configuration files that define the mapping for
PCP metrics to columns (and metric instances to rows).  Metrics
are defined either directly (via metric names) or indirectly via
PCP derived metric specifications.  Value scaling and the units
displayed is automatic based on PCP metric units and data types.

This commit represents a collaborative effort of several months,
primarily between myself, Nathan and BenBE.

Signed-off-by: Sohaib Mohamed <sohaib.amhmd@gmail.com>
Signed-off-by: Nathan Scott <nathans@redhat.com>

1 files changed, 4 insertions, 2 deletions

diff --git a/Row.h b/Row.h
index 5cdb3fe7..c3ae56f0 100644
--- a/Row.h
+++ b/Row.h
@@ -81,7 +81,7 @@ typedef void (*Row_WriteField)(const Row*, RichString*, RowField);
 typedef bool (*Row_IsHighlighted)(const Row*);
 typedef bool (*Row_IsVisible)(const Row*, const struct Table_*);
 typedef bool (*Row_MatchesFilter)(const Row*, const struct Table_*);
-typedef const char* (*Row_SortKeyString)(const Row*);
+typedef const char* (*Row_SortKeyString)(Row*);
 typedef int (*Row_CompareByParent)(const Row*, const Row*);
 
 int Row_compare(const void* v1, const void* v2);
@@ -120,6 +120,8 @@ extern const RowClass Row_class;
 
 void Row_init(Row* this, const struct Machine_* host);
 
+void Row_done(Row* this);
+
 void Row_display(const Object* cast, RichString* out);
 
 void Row_toggleTag(Row* this);
@@ -155,7 +157,7 @@ void Row_printTime(RichString* str, unsigned long long totalHundredths, bool col
 /* Takes rate in bare unit (base 1024) per second. Prints 12 columns. */
 void Row_printRate(RichString* str, double rate, bool coloring);
 
-void Row_printPercentage(float val, char* buffer, size_t n, uint8_t width, int* attr);
+int Row_printPercentage(float val, char* buffer, size_t n, uint8_t width, int* attr);
 
 void Row_display(const Object* cast, RichString* out);